【Java设计模式】1-15章

第1章 内容介绍

1.1 Java设计模式内容介绍

1.1.1 先看几个经典的面试题

1.1.2 设计模式的重要性

1.2 课程亮点和授课方式

第2章 设计模式七大原则

2.1 设计模式的目的

2.2 设计模式七大原则

2.3 ①单一职责原则

方案1

package com.atguigu.principle.singleresponsibility;

public class SingleResponsibility1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Vehicle vehicle = new Vehicle();
		vehicle.run("摩托车");
		vehicle.run("汽车");
		vehicle.run("飞机");
	}

}

// 交通工具类
// 方式1
// 1. 在方式1 的run方法中，违反了单一职责原则
// 2. 解决的方案非常的简单，根据交通工具运行方法不同，分解成不同类即可
class Vehicle {
	public void run(String vehicle) {
		System.out.println(vehicle + " 在公路上运行....");
	}
}

方案2

package com.atguigu.principle.singleresponsibility;

public class SingleResponsibility2 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		RoadVehicle roadVehicle = new RoadVehicle();
		roadVehicle.run("摩托车");
		roadVehicle.run("汽车");
		
		AirVehicle airVehicle = new AirVehicle();
		
		airVehicle.run("飞机");
	}

}

//方案2的分析
//1. 遵守单一职责原则
//2. 但是这样做的改动很大，即将类分解，同时修改客户端
//3. 改进：直接修改Vehicle 类，改动的代码会比较少=>方案3

class RoadVehicle {
	public void run(String vehicle) {
		System.out.println(vehicle + "公路运行");
	}
}

class AirVehicle {
	public void run(String vehicle) {
		System.out.println(vehicle + "天空运行");
	}
}

class WaterVehicle {
	public void run(String vehicle) {
		System.out.println(vehicle + "水中运行");
	}
}

方案3

package com.atguigu.principle.singleresponsibility;

public class SingleResponsibility3 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		Vehicle2 vehicle2  = new Vehicle2();
		vehicle2.run("汽车");
		vehicle2.runWater("轮船");
		vehicle2.runAir("飞机");
	}
}

//方式3的分析
//1. 这种修改方法没有对原来的类做大的修改，只是增加方法
//2. 这里虽然没有在类这个级别上遵守单一职责原则，但是在方法级别上，仍然是遵守单一职责
class Vehicle2 {
	public void run(String vehicle) {
		//处理
		
		System.out.println(vehicle + " 在公路上运行....");
		
	}
	
	public void runAir(String vehicle) {
		System.out.println(vehicle + " 在天空上运行....");
	}
	
	public void runWater(String vehicle) {
		System.out.println(vehicle + " 在水中行....");
	}
	
	//方法2.
	//..
	//..
	
	//...
}

2.4 ②接口隔离原则(Interface Segregation Principle)

package com.atguigu.principle.segregation;

public class Segregation1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub

	}

}

//接口
interface Interface1 {
	void operation1();
	void operation2();
	void operation3();
	void operation4();
	void operation5();
}

class B implements Interface1 {
	public void operation1() {
		System.out.println("B 实现了 operation1");
	}
	
	public void operation2() {
		System.out.println("B 实现了 operation2");
	}
	public void operation3() {
		System.out.println("B 实现了 operation3");
	}
	public void operation4() {
		System.out.println("B 实现了 operation4");
	}
	public void operation5() {
		System.out.println("B 实现了 operation5");
	}
}

class D implements Interface1 {
	public void operation1() {
		System.out.println("D 实现了 operation1");
	}
	
	public void operation2() {
		System.out.println("D 实现了 operation2");
	}
	public void operation3() {
		System.out.println("D 实现了 operation3");
	}
	public void operation4() {
		System.out.println("D 实现了 operation4");
	}
	public void operation5() {
		System.out.println("D 实现了 operation5");
	}
}

class A { //A 类通过接口Interface1 依赖(使用) B类，但是只会用到1,2,3方法
	public void depend1(Interface1 i) {
		i.operation1();
	}
	public void depend2(Interface1 i) {
		i.operation2();
	}
	public void depend3(Interface1 i) {
		i.operation3();
	}
}
  
class C { //C 类通过接口Interface1 依赖(使用) D类，但是只会用到1,4,5方法
	public void depend1(Interface1 i) {
		i.operation1();
	}
	public void depend4(Interface1 i) {
		i.operation4();
	}
	public void depend5(Interface1 i) {
		i.operation5();
	}
}

package com.atguigu.principle.segregation.improve;

public class Segregation1 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		// 使用一把
		A a = new A();
		a.depend1(new B()); // A类通过接口去依赖B类
		a.depend2(new B());
		a.depend3(new B());

		C c = new C();

		c.depend1(new D()); // C类通过接口去依赖(使用)D类
		c.depend4(new D());
		c.depend5(new D());

	}

}

// 接口1
interface Interface1 {
	void operation1();

}

// 接口2
interface Interface2 {
	void operation2();

	void operation3();
}

// 接口3
interface Interface3 {
	void operation4();

	void operation5();
}

class B implements Interface1, Interface2 {
	public void operation1() {
		System.out.println("B 实现了 operation1");
	}

	public void operation2() {
		System.out.println("B 实现了 operation2");
	}

	public void operation3() {
		System.out.println("B 实现了 operation3");
	}

}

class D implements Interface1, Interface3 {
	public void operation1() {
		System.out.println("D 实现了 operation1");
	}

	public void operation4() {
		System.out.println("D 实现了 operation4");
	}

	public void operation5() {
		System.out.println("D 实现了 operation5");
	}
}

class A { // A 类通过接口Interface1,Interface2 依赖(使用) B类，但是只会用到1,2,3方法
	public void depend1(Interface1 i) {
		i.operation1();
	}

	public void depend2(Interface2 i) {
		i.operation2();
	}

	public void depend3(Interface2 i) {
		i.operation3();
	}
}

class C { // C 类通过接口Interface1,Interface3 依赖(使用) D类，但是只会用到1,4,5方法
	public void depend1(Interface1 i) {
		i.operation1();
	}

	public void depend4(Interface3 i) {
		i.operation4();
	}

	public void depend5(Interface3 i) {
		i.operation5();
	}
}

2.5 ③依赖倒转原则

方案1

package com.atguigu.principle.inversion;

public class DependecyInversion {

	public static void main(String[] args) {
		Person person = new Person();
		person.receive(new Email());
	}

}


class Email {
	public String getInfo() {
		return "电子邮件信息: hello,world";
	}
}

//完成Person接收消息的功能
//方式1分析
//1. 简单，比较容易想到
//2. 如果我们获取的对象是 微信，短信等等，则新增类，同时Perons也要增加相应的接收方法
//3. 解决思路：引入一个抽象的接口IReceiver, 表示接收者, 这样Person类与接口IReceiver发生依赖
//   因为Email, WeiXin 等等属于接收的范围，他们各自实现IReceiver 接口就ok, 这样我们就符号依赖倒转原则
class Person {
	public void receive(Email email ) {
		System.out.println(email.getInfo());
	}
}

方案2（改进）

package com.atguigu.principle.inversion.improve;

public class DependecyInversion {

	public static void main(String[] args) {
		//客户端无需改变
		Person person = new Person();
		person.receive(new Email());
		
		person.receive(new WeiXin());
	}

}

//定义接口
interface IReceiver {
	public String getInfo();
}

class Email implements IReceiver {
	public String getInfo() {
		return "电子邮件信息: hello,world";
	}
}

//增加微信
class WeiXin implements IReceiver {
	public String getInfo() {
		return "微信信息: hello,ok";
	}
}

//方式2
class Person {
	//这里我们是对接口的依赖
	public void receive(IReceiver receiver ) {
		System.out.println(receiver.getInfo());
	}
}

package com.atguigu.principle.inversion.improve;

public class DependencyPass {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ChangHong changHong = new ChangHong();
//		OpenAndClose openAndClose = new OpenAndClose();
//		openAndClose.open(changHong);
		
		//通过构造器进行依赖传递
//		OpenAndClose openAndClose = new OpenAndClose(changHong);
//		openAndClose.open();
		//通过setter方法进行依赖传递
		OpenAndClose openAndClose = new OpenAndClose();
		openAndClose.setTv(changHong);
		openAndClose.open();

	}

}

// 方式1： 通过接口传递实现依赖
// 开关的接口
// interface IOpenAndClose {
// public void open(ITV tv); //抽象方法,接收接口
// }
//
// interface ITV { //ITV接口
// public void play();
// }
// 
// class ChangHong implements ITV {
//
//	@Override
//	public void play() {
//		// TODO Auto-generated method stub
//		System.out.println("长虹电视机，打开");
//	}
//	 
// }
 实现接口
// class OpenAndClose implements IOpenAndClose{
// public void open(ITV tv){
// tv.play();
// }
// }

// 方式2: 通过构造方法依赖传递
// interface IOpenAndClose {
// public void open(); //抽象方法
// }
// interface ITV { //ITV接口
// public void play();
// }
// class OpenAndClose implements IOpenAndClose{
// public ITV tv; //成员
// public OpenAndClose(ITV tv){ //构造器
// this.tv = tv;
// }
// public void open(){
// this.tv.play();
// }
// }


// 方式3 , 通过setter方法传递
interface IOpenAndClose {
	public void open(); // 抽象方法

	public void setTv(ITV tv);
}

interface ITV { // ITV接口
	public void play();
}

class OpenAndClose implements IOpenAndClose {
	private ITV tv;

	public void setTv(ITV tv) {
		this.tv = tv;
	}

	public void open() {
		this.tv.play();
	}
}

class ChangHong implements ITV {

	@Override
	public void play() {
		// TODO Auto-generated method stub
		System.out.println("长虹电视机，打开");
	}
	 
}

2.6 ④里氏替换原则

package com.atguigu.principle.liskov;

public class Liskov {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		A a = new A();
		System.out.println("11-3=" + a.func1(11, 3));
		System.out.println("1-8=" + a.func1(1, 8));

		System.out.println("-----------------------");
		B b = new B();
		System.out.println("11-3=" + b.func1(11, 3));//这里本意是求出11-3
		System.out.println("1-8=" + b.func1(1, 8));// 1-8
		System.out.println("11+3+9=" + b.func2(11, 3));
	}
}

// A类
class A {
	// 返回两个数的差
	public int func1(int num1, int num2) {
		return num1 - num2;
	}
}

// B类继承了A
// 增加了一个新功能：完成两个数相加,然后和9求和
class B extends A {
	//这里，重写了A类的方法, 可能是无意识
	public int func1(int a, int b) {
		return a + b;
	}

	public int func2(int a, int b) {
		return func1(a, b) + 9;
	}
}

改进方案

package com.atguigu.principle.liskov.improve;

public class Liskov {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		A a = new A();
		System.out.println("11-3=" + a.func1(11, 3));
		System.out.println("1-8=" + a.func1(1, 8));

		System.out.println("-----------------------");
		B b = new B();
		//因为B类不再继承A类，因此调用者，不会再func1是求减法
		//调用完成的功能就会很明确
		System.out.println("11+3=" + b.func1(11, 3));//这里本意是求出11+3
		System.out.println("1+8=" + b.func1(1, 8));// 1+8
		System.out.println("11+3+9=" + b.func2(11, 3));
		
		
		//使用组合仍然可以使用到A类相关方法
		System.out.println("11-3=" + b.func3(11, 3));// 这里本意是求出11-3
		

	}

}

//创建一个更加基础的基类
class Base {
	//把更加基础的方法和成员写到Base类
}

// A类
class A extends Base {
	// 返回两个数的差
	public int func1(int num1, int num2) {
		return num1 - num2;
	}
}

// B类继承了A
// 增加了一个新功能：完成两个数相加,然后和9求和
class B extends Base {
	//如果B需要使用A类的方法,使用组合关系
	private A a = new A();
	
	//这里，重写了A类的方法, 可能是无意识
	public int func1(int a, int b) {
		return a + b;
	}

	public int func2(int a, int b) {
		return func1(a, b) + 9;
	}
	
	//我们仍然想使用A的方法
	public int func3(int a, int b) {
		return this.a.func1(a, b);
	}
}

2.7 ⑤开闭原则

package com.atguigu.principle.ocp;

public class Ocp {

	public static void main(String[] args) {
		//使用看看存在的问题
		GraphicEditor graphicEditor = new GraphicEditor();
		graphicEditor.drawShape(new Rectangle());
		graphicEditor.drawShape(new Circle());
		graphicEditor.drawShape(new Triangle());
	}

}

//这是一个用于绘图的类 [使用方]
class GraphicEditor {
	//接收Shape对象，然后根据type，来绘制不同的图形
	public void drawShape(Shape s) {
		if (s.m_type == 1)
			drawRectangle(s);
		else if (s.m_type == 2)
			drawCircle(s);
		else if (s.m_type == 3)
			drawTriangle(s);
	}

	//绘制矩形
	public void drawRectangle(Shape r) {
		System.out.println(" 绘制矩形 ");
	}

	//绘制圆形
	public void drawCircle(Shape r) {
		System.out.println(" 绘制圆形 ");
	}
	
	//绘制三角形
	public void drawTriangle(Shape r) {
		System.out.println(" 绘制三角形 ");
	}
}

//Shape类，基类
class Shape {
	int m_type;
}

class Rectangle extends Shape {
	Rectangle() {
		super.m_type = 1;
	}
}

class Circle extends Shape {
	Circle() {
		super.m_type = 2;
	}
}

//新增画三角形
class Triangle extends Shape {
	Triangle() {
		super.m_type = 3;
	}
}

方式2（改进）

package com.atguigu.principle.ocp.improve;

public class Ocp {

	public static void main(String[] args) {
		//使用看看存在的问题
		GraphicEditor graphicEditor = new GraphicEditor();
		graphicEditor.drawShape(new Rectangle());
		graphicEditor.drawShape(new Circle());
		graphicEditor.drawShape(new Triangle());
		graphicEditor.drawShape(new OtherGraphic());
	}

}

//这是一个用于绘图的类 [使用方]
class GraphicEditor {
	//接收Shape对象，调用draw方法
	public void drawShape(Shape s) {
		s.draw();
	}

	
}

//Shape类，基类
abstract class Shape {
	int m_type;
	
	public abstract void draw();//抽象方法
}

class Rectangle extends Shape {
	Rectangle() {
		super.m_type = 1;
	}

	@Override
	public void draw() {
		// TODO Auto-generated method stub
		System.out.println(" 绘制矩形 ");
	}
}

class Circle extends Shape {
	Circle() {
		super.m_type = 2;
	}
	@Override
	public void draw() {
		// TODO Auto-generated method stub
		System.out.println(" 绘制圆形 ");
	}
}

//新增画三角形
class Triangle extends Shape {
	Triangle() {
		super.m_type = 3;
	}
	@Override
	public void draw() {
		// TODO Auto-generated method stub
		System.out.println(" 绘制三角形 ");
	}
}

//新增一个图形
class OtherGraphic extends Shape {
	OtherGraphic() {
		super.m_type = 4;
	}

	@Override
	public void draw() {
		// TODO Auto-generated method stub
		System.out.println(" 绘制其它图形 ");
	}
}

2.8 ⑥迪米特法则

package com.atguigu.principle.demeter;

import java.util.ArrayList;
import java.util.List;

//客户端
public class Demeter1 {

	public static void main(String[] args) {
		//创建了一个 SchoolManager 对象
		SchoolManager schoolManager = new SchoolManager();
		//输出学院的员工id 和  学校总部的员工信息
		schoolManager.printAllEmployee(new CollegeManager());

	}

}


//学校总部员工类
class Employee {
	private String id;

	public void setId(String id) {
		this.id = id;
	}

	public String getId() {
		return id;
	}
}


//学院的员工类
class CollegeEmployee {
	private String id;

	public void setId(String id) {
		this.id = id;
	}

	public String getId() {
		return id;
	}
}


//管理学院员工的管理类
class CollegeManager {
	//返回学院的所有员工
	public List<CollegeEmployee> getAllEmployee() {
		List<CollegeEmployee> list = new ArrayList<CollegeEmployee>();
		for (int i = 0; i < 10; i++) { //这里我们增加了10个员工到 list
			CollegeEmployee emp = new CollegeEmployee();
			emp.setId("学院员工id= " + i);
			list.add(emp);
		}
		return list;
	}
}

//学校管理类

//分析 SchoolManager 类的直接朋友类有哪些 Employee、CollegeManager
//CollegeEmployee 不是 直接朋友 而是一个陌生类，这样违背了 迪米特法则 
class SchoolManager {
	//返回学校总部的员工
	public List<Employee> getAllEmployee() {
		List<Employee> list = new ArrayList<Employee>();
		
		for (int i = 0; i < 5; i++) { //这里我们增加了5个员工到 list
			Employee emp = new Employee();
			emp.setId("学校总部员工id= " + i);
			list.add(emp);
		}
		return list;
	}

	//该方法完成输出学校总部和学院员工信息(id)
	void printAllEmployee(CollegeManager sub) {
		
		//分析问题
		//1. 这里的 CollegeEmployee 不是  SchoolManager的直接朋友
		//2. CollegeEmployee 是以局部变量方式出现在 SchoolManager
		//3. 违反了 迪米特法则 
		
		//获取到学院员工
		List<CollegeEmployee> list1 = sub.getAllEmployee();
		System.out.println("------------学院员工------------");
		for (CollegeEmployee e : list1) {
			System.out.println(e.getId());
		}
		//获取到学校总部员工
		List<Employee> list2 = this.getAllEmployee();
		System.out.println("------------学校总部员工------------");
		for (Employee e : list2) {
			System.out.println(e.getId());
		}
	}
}

改进代码

package com.atguigu.principle.demeter.improve;

import java.util.ArrayList;
import java.util.List;

//客户端
public class Demeter1 {

	public static void main(String[] args) {
		System.out.println("~~~使用迪米特法则的改进~~~");
		//创建了一个 SchoolManager 对象
		SchoolManager schoolManager = new SchoolManager();
		//输出学院的员工id 和  学校总部的员工信息
		schoolManager.printAllEmployee(new CollegeManager());

	}

}


//学校总部员工类
class Employee {
	private String id;

	public void setId(String id) {
		this.id = id;
	}

	public String getId() {
		return id;
	}
}


//学院的员工类
class CollegeEmployee {
	private String id;

	public void setId(String id) {
		this.id = id;
	}

	public String getId() {
		return id;
	}
}


//管理学院员工的管理类
class CollegeManager {
	//返回学院的所有员工
	public List<CollegeEmployee> getAllEmployee() {
		List<CollegeEmployee> list = new ArrayList<CollegeEmployee>();
		for (int i = 0; i < 10; i++) { //这里我们增加了10个员工到 list
			CollegeEmployee emp = new CollegeEmployee();
			emp.setId("学院员工id= " + i);
			list.add(emp);
		}
		return list;
	}
	
	//输出学院员工的信息
	public void printEmployee() {
		//获取到学院员工
		List<CollegeEmployee> list1 = getAllEmployee();
		System.out.println("------------学院员工------------");
		for (CollegeEmployee e : list1) {
			System.out.println(e.getId());
		}
	}
}

//学校管理类

//分析 SchoolManager 类的直接朋友类有哪些 Employee、CollegeManager
//CollegeEmployee 不是 直接朋友 而是一个陌生类，这样违背了 迪米特法则 
class SchoolManager {
	//返回学校总部的员工
	public List<Employee> getAllEmployee() {
		List<Employee> list = new ArrayList<Employee>();
		
		for (int i = 0; i < 5; i++) { //这里我们增加了5个员工到 list
			Employee emp = new Employee();
			emp.setId("学校总部员工id= " + i);
			list.add(emp);
		}
		return list;
	}

	//该方法完成输出学校总部和学院员工信息(id)
	void printAllEmployee(CollegeManager sub) {
		
		//分析问题
		//1. 将输出学院的员工方法，封装到CollegeManager
		sub.printEmployee();
	
		//获取到学校总部员工
		List<Employee> list2 = this.getAllEmployee();
		System.out.println("------------学校总部员工------------");
		for (Employee e : list2) {
			System.out.println(e.getId());
		}
	}
}

2.9 ⑦合成复用原则(Composite Reuse Principle)

2.10 设计原则核心思想

第3章 UML类图

3.1 UML基本介绍

3.2 UML图

3.3 UML类图

3.4 类图---依赖关系(Dependence)

3.5 类图-泛化关系(generalization)

3.6 类图-实现关系(Implementation)

3.7 类图-关联关系(Association)

3.8 类图-聚合关系(Aggregation)

3.9 类图-组合关系(Composition)

第4章 设计模式概述

4.1 掌握设计模式的层次

4.2 设计模式介绍

4.3 设计模式类型

创建型模式：

第5章 1单例设计模式(singleton)★

5.1 单例设计模式介绍

5.2 单例设计模式八种方式

5.3 ①饿汉式(静态常量)

package com.atguigu.singleton.type1;

public class SingletonTest01 {

	public static void main(String[] args) {
		//测试
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
	}

}

//饿汉式(静态变量)

class Singleton {
	
	//1. 构造器私有化, 外部能new
	private Singleton() {
		
	}
	
	//2.本类内部创建对象实例
	private final static Singleton instance = new Singleton();
	
	//3. 提供一个公有的静态方法，返回实例对象
	public static Singleton getInstance() {
		return instance;
	}
	
}

5.4 ②饿汉式(静态代码块)

package com.atguigu.singleton.type2;

public class SingletonTest02 {

	public static void main(String[] args) {
		//测试
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
	}

}

//饿汉式(静态代码块)

class Singleton {
	
	//1. 构造器私有化, 外部能new
	private Singleton() {
		
	}
	

	//2.本类内部创建对象实例
	private  static Singleton instance;
	
	static { // 在静态代码块中，创建单例对象
		instance = new Singleton();
	}
	
	//3. 提供一个公有的静态方法，返回实例对象
	public static Singleton getInstance() {
		return instance;
	}
	
}

5.5 ③懒汉式(线程不安全)

package com.atguigu.singleton.type3;


public class SingletonTest03 {

	public static void main(String[] args) {
		System.out.println("懒汉式1 ， 线程不安全~");
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
	}

}

class Singleton {
	private static Singleton instance;
	
	private Singleton() {}
	
	//提供一个静态的公有方法，当使用到该方法时，才去创建 instance
	//即懒汉式
	public static Singleton getInstance() {
		if(instance == null) {
			instance = new Singleton();
		}
		return instance;
	}
}

5.6 ④懒汉式(线程安全，同步方法)

package com.atguigu.singleton.type4;


public class SingletonTest04 {

	public static void main(String[] args) {
		System.out.println("懒汉式2 ， 线程安全~");
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
	}

}

// 懒汉式(线程安全，同步方法)
class Singleton {
	private static Singleton instance;
	
	private Singleton() {}
	
	//提供一个静态的公有方法，加入同步处理的代码，解决线程安全问题
	//即懒汉式
	public static synchronized Singleton getInstance() {
		if(instance == null) {
			instance = new Singleton();
		}
		return instance;
	}
}

5.7 ⑤懒汉式(线程安全，同步代码块)

5.8 ⑥双重检查(DoubleCheck)

package com.atguigu.singleton.type6;


public class SingletonTest06 {

	public static void main(String[] args) {
		System.out.println("双重检查");
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
		
	}

}

// 懒汉式(线程安全，同步方法)
class Singleton {
	private static volatile Singleton instance;
	
	private Singleton() {}
	
	//提供一个静态的公有方法，加入双重检查代码，解决线程安全问题, 同时解决懒加载问题
	//同时保证了效率, 推荐使用
	
	public static synchronized Singleton getInstance() {
		if(instance == null) {
			synchronized (Singleton.class) {
				if(instance == null) {
					instance = new Singleton();
				}
			}
			
		}
		return instance;
	}
}

5.9 ⑦静态内部类

package com.atguigu.singleton.type7;


public class SingletonTest07 {

	public static void main(String[] args) {
		System.out.println("使用静态内部类完成单例模式");
		Singleton instance = Singleton.getInstance();
		Singleton instance2 = Singleton.getInstance();
		System.out.println(instance == instance2); // true
		System.out.println("instance.hashCode=" + instance.hashCode());
		System.out.println("instance2.hashCode=" + instance2.hashCode());
		
	}

}

// 静态内部类完成单例模式，推荐使用
class Singleton {
	private static volatile Singleton instance;
	
	//构造器私有化
	private Singleton() {}
	
	//写一个静态内部类,该类中有一个静态属性 Singleton
	private static class SingletonInstance {
		private static final Singleton INSTANCE = new Singleton(); 
	}
	
	//提供一个静态的公有方法，直接返回SingletonInstance.INSTANCE
	
	public static synchronized Singleton getInstance() {
		
		return SingletonInstance.INSTANCE;
	}
}

5.10 ⑧枚举

package com.atguigu.singleton.type8;

public class SingletonTest08 {
	public static void main(String[] args) {
		Singleton instance = Singleton.INSTANCE;
		Singleton instance2 = Singleton.INSTANCE;
		System.out.println(instance == instance2);
		
		System.out.println(instance.hashCode());
		System.out.println(instance2.hashCode());
		
		instance.sayOK();
	}
}

//使用枚举，可以实现单例, 推荐
enum Singleton {
	INSTANCE; //属性
	public void sayOK() {
		System.out.println("ok~");
	}
}

5.11 单例模式在JDK应用的源码分析

5.12 单例模式注意事项和细节说明

第6章 2工厂模式(factory)★

6.1 ①简单工厂模式

prepare：准备原材料 bake：烘烤 cut：切割 box：打包

传统方式

package com.atguigu.factory.simplefactory.pizzastore.pizza;

//将Pizza 类做成抽象
public abstract class Pizza {
	protected String name; //名字

	//准备原材料, 不同的披萨不一样，因此，我们做成抽象方法
	public abstract void prepare();

	
	public void bake() {
		System.out.println(name + " baking;");
	}

	public void cut() {
		System.out.println(name + " cutting;");
	}

	//打包
	public void box() {
		System.out.println(name + " boxing;");
	}

	public void setName(String name) {
		this.name = name;
	}
}

package com.atguigu.factory.simplefactory.pizzastore.pizza;

public class CheesePizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给制作奶酪披萨 准备原材料 ");
	}

}

package com.atguigu.factory.simplefactory.pizzastore.pizza;

public class GreekPizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给希腊披萨 准备原材料 ");
	}

}

package com.atguigu.factory.simplefactory.pizzastore.pizza;

public class PepperPizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		System.out.println(" 给胡椒披萨准备原材料 ");
	}

}

订购披萨

package com.atguigu.factory.simplefactory.pizzastore.order;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;

public class OrderPizza {

	// 构造器
	public OrderPizza() {
		Pizza pizza = null;
		String orderType; // 订购披萨的类型
		do {
			orderType = getType();
			if (orderType.equals("greek")) {
				pizza = new GreekPizza();
				pizza.setName(" 希腊披萨 ");
			} else if (orderType.equals("cheese")) {
				pizza = new CheesePizza();
				pizza.setName(" 奶酪披萨 ");
			} else if (orderType.equals("pepper")) {
				pizza = new PepperPizza();
				pizza.setName("胡椒披萨");
			} else {
				break;
			}
			//输出pizza 制作过程
			pizza.prepare();
			pizza.bake();
			pizza.cut();
			pizza.box();

		} while (true);
	}
	
	// 写一个方法，可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}

}

披萨店（客户端）

package com.atguigu.factory.simplefactory.pizzastore.order;

//相当于一个客户端，发出订购
public class PizzaStore {

	public static void main(String[] args) {
		new OrderPizza();
	}
}

package com.atguigu.factory.simplefactory.pizzastore.order;

import com.atguigu.factory.simplefactory.pizzastore.pizza.CheesePizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.GreekPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.PepperPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;

//简单工厂类
public class SimpleFactory {

	//根据orderType 返回对应的Pizza 对象
	public Pizza createPizza(String orderType) {

		Pizza pizza = null;

		System.out.println("使用简单工厂模式");
		if (orderType.equals("greek")) {
			pizza = new GreekPizza();
			pizza.setName(" 希腊披萨 ");
		} else if (orderType.equals("cheese")) {
			pizza = new CheesePizza();
			pizza.setName(" 奶酪披萨 ");
		} else if (orderType.equals("pepper")) {
			pizza = new PepperPizza();
			pizza.setName("胡椒披萨");
		}
		
		return pizza;
	}

}

package com.atguigu.factory.simplefactory.pizzastore.order;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;


import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;

public class OrderPizza {

	//定义一个简单工厂对象
	SimpleFactory simpleFactory;
	Pizza pizza = null;
	
	//构造器
	public OrderPizza(SimpleFactory simpleFactory) {
		setFactory(simpleFactory);
	}
	
	public void setFactory(SimpleFactory simpleFactory) {
		String orderType = ""; //用户输入的
		
		this.simpleFactory = simpleFactory; //设置简单工厂对象
		
		do {
			orderType = getType(); 
			pizza = this.simpleFactory.createPizza(orderType);
			
			//输出pizza
			if(pizza != null) { //订购成功
				pizza.prepare();
				pizza.bake();
				pizza.cut();
				pizza.box();
			} else {
				System.out.println(" 订购披萨失败 ");
				break;
			}
		}while(true);
	}
	
	// 写一个方法，可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}

}

披萨店（客户端）

package com.atguigu.factory.simplefactory.pizzastore.order;

//相当于一个客户端，发出订购
public class PizzaStore {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//new OrderPizza();
		
		//使用简单工厂模式
		new OrderPizza(new SimpleFactory());
		System.out.println("~~退出程序~~");
	}
}

---

简单工厂模式额外补充说明（静态工厂模式），方法变为静态，调用更加方便

package com.atguigu.factory.simplefactory.pizzastore.order;

import com.atguigu.factory.simplefactory.pizzastore.pizza.CheesePizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.GreekPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.PepperPizza;
import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;

//简单工厂类
public class SimpleFactory {

	//根据orderType 返回对应的Pizza 对象
	public Pizza createPizza(String orderType) {

		Pizza pizza = null;

		System.out.println("使用简单工厂模式");
		if (orderType.equals("greek")) {
			pizza = new GreekPizza();
			pizza.setName(" 希腊披萨 ");
		} else if (orderType.equals("cheese")) {
			pizza = new CheesePizza();
			pizza.setName(" 奶酪披萨 ");
		} else if (orderType.equals("pepper")) {
			pizza = new PepperPizza();
			pizza.setName("胡椒披萨");
		}
		
		return pizza;
	}
	
	//额外补充：简单工厂模式 也叫 静态工厂模式 	
	public static Pizza createPizza2(String orderType) {

		Pizza pizza = null;

		System.out.println("使用简单工厂模式2");
		if (orderType.equals("greek")) {
			pizza = new GreekPizza();
			pizza.setName(" 希腊披萨 ");
		} else if (orderType.equals("cheese")) {
			pizza = new CheesePizza();
			pizza.setName(" 奶酪披萨 ");
		} else if (orderType.equals("pepper")) {
			pizza = new PepperPizza();
			pizza.setName("胡椒披萨");
		}
		
		return pizza;
	}

}

package com.atguigu.factory.simplefactory.pizzastore.order;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import com.atguigu.factory.simplefactory.pizzastore.pizza.Pizza;

public class OrderPizza2 {

	Pizza pizza = null;
	String orderType = "";
	// 构造器
	public OrderPizza2() {
		
		do {
			orderType = getType();
			pizza = SimpleFactory.createPizza2(orderType);

			// 输出pizza
			if (pizza != null) { // 订购成功
				pizza.prepare();
				pizza.bake();
				pizza.cut();
				pizza.box();
			} else {
				System.out.println(" 订购披萨失败 ");
				break;
			}
		} while (true);
	}

	// 写一个方法，可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}
}

披萨店（客户端），使用静态方法，不用再传入工厂对象参数

package com.atguigu.factory.simplefactory.pizzastore.order;

//相当于一个客户端，发出订购
public class PizzaStore {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//new OrderPizza();
		
		//使用简单工厂模式
		//new OrderPizza(new SimpleFactory());
		//System.out.println("~~退出程序~~");
		
        //使用静态方法，不用再传入工厂对象参数
		new OrderPizza2();
	}

}

6.2 ②工厂方法模式

pizza

package com.atguigu.factory.factorymethod.pizzastore.pizza;

//将Pizza 类做成抽象
public abstract class Pizza {
	protected String name; //名字

	//准备原材料, 不同的披萨不一样，因此，我们做成抽象方法
	public abstract void prepare();

	
	public void bake() {
		System.out.println(name + " baking;");
	}

	public void cut() {
		System.out.println(name + " cutting;");
	}

	//打包
	public void box() {
		System.out.println(name + " boxing;");
	}

	public void setName(String name) {
		this.name = name;
	}
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class BJCheesePizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("北京的奶酪pizza");
		System.out.println(" 北京的奶酪pizza 准备原材料");
	}
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class BJPepperPizza extends Pizza {
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("北京的胡椒pizza");
		System.out.println(" 北京的胡椒pizza 准备原材料");
	}
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class LDCheesePizza extends Pizza{

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("伦敦的奶酪pizza");
		System.out.println(" 伦敦的奶酪pizza 准备原材料");
	}
}

package com.atguigu.factory.factorymethod.pizzastore.pizza;

public class LDPepperPizza extends Pizza{
	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("伦敦的胡椒pizza");
		System.out.println(" 伦敦的胡椒pizza 准备原材料");
	}
}

order

package com.atguigu.factory.factorymethod.pizzastore.order;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import com.atguigu.factory.factorymethod.pizzastore.pizza.Pizza;

public abstract class OrderPizza {

	//定义一个抽象方法，createPizza , 让各个工厂子类自己实现
	abstract Pizza createPizza(String orderType);
	
	// 构造器
	public OrderPizza() {
		Pizza pizza = null;
		String orderType; // 订购披萨的类型
		do {
			orderType = getType();
			pizza = createPizza(orderType); //抽象方法，由工厂子类完成
			//输出pizza 制作过程
			pizza.prepare();
			pizza.bake();
			pizza.cut();
			pizza.box();
			
		} while (true);
	}

	// 写一个方法，可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}
}

package com.atguigu.factory.factorymethod.pizzastore.order;

import com.atguigu.factory.factorymethod.pizzastore.pizza.BJCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.BJPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.Pizza;

public class BJOrderPizza extends OrderPizza {

	@Override
	Pizza createPizza(String orderType) {
	
		Pizza pizza = null;
		if(orderType.equals("cheese")) {
			pizza = new BJCheesePizza();
		} else if (orderType.equals("pepper")) {
			pizza = new BJPepperPizza();
		}
		// TODO Auto-generated method stub
		return pizza;
	}
}

package com.atguigu.factory.factorymethod.pizzastore.order;

import com.atguigu.factory.factorymethod.pizzastore.pizza.BJCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.BJPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.LDCheesePizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.LDPepperPizza;
import com.atguigu.factory.factorymethod.pizzastore.pizza.Pizza;

public class LDOrderPizza extends OrderPizza {
	
	@Override
	Pizza createPizza(String orderType) {
	
		Pizza pizza = null;
		if(orderType.equals("cheese")) {
			pizza = new LDCheesePizza();
		} else if (orderType.equals("pepper")) {
			pizza = new LDPepperPizza();
		}
		// TODO Auto-generated method stub
		return pizza;
	}
}

披萨店（客户端）

package com.atguigu.factory.factorymethod.pizzastore.order;

public class PizzaStore {

	public static void main(String[] args) {
		String loc = "bj";
		if (loc.equals("bj")) {
			//创建北京口味的各种Pizza
			new BJOrderPizza();
		} else {
			//创建伦敦口味的各种Pizza
			new LDOrderPizza();
		}
		// TODO Auto-generated method stub
	}

}

6.3 ③抽象工厂模式

pizza（列举BJCheesePizza、LDCheesePizza）

package com.atguigu.factory.absfactory.pizzastore.pizza;

//将Pizza 类做成抽象
public abstract class Pizza {
	protected String name; //名字

	//准备原材料, 不同的披萨不一样，因此，我们做成抽象方法
	public abstract void prepare();

	
	public void bake() {
		System.out.println(name + " baking;");
	}

	public void cut() {
		System.out.println(name + " cutting;");
	}

	//打包
	public void box() {
		System.out.println(name + " boxing;");
	}

	public void setName(String name) {
		this.name = name;
	}
}

package com.atguigu.factory.absfactory.pizzastore.pizza;

public class BJCheesePizza extends Pizza {

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("北京的奶酪pizza");
		System.out.println(" 北京的奶酪pizza 准备原材料");
	}
}

package com.atguigu.factory.absfactory.pizzastore.pizza;

public class LDCheesePizza extends Pizza{

	@Override
	public void prepare() {
		// TODO Auto-generated method stub
		setName("伦敦的奶酪pizza");
		System.out.println(" 伦敦的奶酪pizza 准备原材料");
	}
}

order

package com.atguigu.factory.absfactory.pizzastore.order;

import com.atguigu.factory.absfactory.pizzastore.pizza.Pizza;

//一个抽象工厂模式的抽象层(接口)
public interface AbsFactory {
	//让下面的工厂子类来 具体实现
	public Pizza createPizza(String orderType);
}

package com.atguigu.factory.absfactory.pizzastore.order;

import com.atguigu.factory.absfactory.pizzastore.pizza.BJCheesePizza;
import com.atguigu.factory.absfactory.pizzastore.pizza.BJPepperPizza;
import com.atguigu.factory.absfactory.pizzastore.pizza.Pizza;

//这是工厂子类
public class BJFactory implements AbsFactory {

	@Override
	public Pizza createPizza(String orderType) {
		System.out.println("~使用的是抽象工厂模式~");
		// TODO Auto-generated method stub
		Pizza pizza = null;
		if(orderType.equals("cheese")) {
			pizza = new BJCheesePizza();
		} else if (orderType.equals("pepper")){
			pizza = new BJPepperPizza();
		}
		return pizza;
	}
}

package com.atguigu.factory.absfactory.pizzastore.order;


import com.atguigu.factory.absfactory.pizzastore.pizza.LDCheesePizza;
import com.atguigu.factory.absfactory.pizzastore.pizza.LDPepperPizza;
import com.atguigu.factory.absfactory.pizzastore.pizza.Pizza;

//这是工厂子类
public class LDFactory implements AbsFactory {

	@Override
	public Pizza createPizza(String orderType) {
		System.out.println("~使用的是抽象工厂模式~");
		Pizza pizza = null;
		if (orderType.equals("cheese")) {
			pizza = new LDCheesePizza();
		} else if (orderType.equals("pepper")) {
			pizza = new LDPepperPizza();
		}
		return pizza;
	}
}

OrderPizza

package com.atguigu.factory.absfactory.pizzastore.order;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

import com.atguigu.factory.absfactory.pizzastore.pizza.Pizza;

public class OrderPizza {

	AbsFactory factory;

	// 构造器
	public OrderPizza(AbsFactory factory) {
		setFactory(factory);
	}

	private void setFactory(AbsFactory factory) {
		Pizza pizza = null;
		String orderType = ""; // 用户输入
		this.factory = factory;
		do {
			orderType = getType();
			// factory 可能是北京的工厂子类，也可能是伦敦的工厂子类
			pizza = factory.createPizza(orderType);
			if (pizza != null) { // 订购ok
				pizza.prepare();
				pizza.bake();
				pizza.cut();
				pizza.box();
			} else {
				System.out.println("订购失败");
				break;
			}
		} while (true);
	}

	// 写一个方法，可以获取客户希望订购的披萨种类
	private String getType() {
		try {
			BufferedReader strin = new BufferedReader(new InputStreamReader(System.in));
			System.out.println("input pizza 种类:");
			String str = strin.readLine();
			return str;
		} catch (IOException e) {
			e.printStackTrace();
			return "";
		}
	}
}

披萨店（客户端）

package com.atguigu.factory.absfactory.pizzastore.order;

public class PizzaStore {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//new OrderPizza(new BJFactory());
		new OrderPizza(new LDFactory());
	}
}

6.4 工厂模式在JDK-Calendar应用的源码分析

private static Calendar createCalendar(TimeZone zone,
									   Locale aLocale)//根据 zone,aLocale创建对应实例
{
	CalendarProvider provider =
			LocaleProviderAdapter.getAdapter(CalendarProvider.class, aLocale)
					.getCalendarProvider();
	if (provider != null) {
		try {
			return provider.getInstance(zone, aLocale);
		} catch (IllegalArgumentException iae) {
			// fall back to the default instantiation
		}
	}

	Calendar cal = null;

	if (aLocale.hasExtensions()) {
		String caltype = aLocale.getUnicodeLocaleType("ca");
		if (caltype != null) {
			switch (caltype) {
				case "buddhist":
					cal = new BuddhistCalendar(zone, aLocale);
					break;
				case "japanese":
					cal = new JapaneseImperialCalendar(zone, aLocale);
					break;
				case "gregory":
					cal = new GregorianCalendar(zone, aLocale);
					break;
			}
		}
	}
	if (cal == null) {
		// If no known calendar type is explicitly specified,
		// perform the traditional way to create a Calendar:
		// create a BuddhistCalendar for th_TH locale,
		// a JapaneseImperialCalendar for ja_JP_JP locale, or
		// a GregorianCalendar for any other locales.
		// NOTE: The language, country and variant strings are interned.
		if (aLocale.getLanguage() == "th" && aLocale.getCountry() == "TH") {
			cal = new BuddhistCalendar(zone, aLocale);
		} else if (aLocale.getVariant() == "JP" && aLocale.getLanguage() == "ja"
				&& aLocale.getCountry() == "JP") {
			cal = new JapaneseImperialCalendar(zone, aLocale);
		} else {
			cal = new GregorianCalendar(zone, aLocale);
		}
	}
	return cal;
}

6.5 工厂模式小结

第7章 3原型模式(prototype)

7.1 克隆羊问题

7.2 传统方式解决克隆羊问题

package com.atguigu.prototype;

public class Sheep {
	private String name;
	private int age;
	private String color;
	public Sheep(String name, int age, String color) {
		super();
		this.name = name;
		this.age = age;
		this.color = color;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	@Override
	public String toString() {
		return "Sheep [name=" + name + ", age=" + age + ", color=" + color + "]";
	}
		
}

package com.atguigu.prototype;

public class Client {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		//传统的方法
		Sheep sheep = new Sheep("tom", 1, "白色");
		
		Sheep sheep2 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep3 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep4 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		Sheep sheep5 = new Sheep(sheep.getName(), sheep.getAge(), sheep.getColor());
		//....
		
		System.out.println(sheep);
		System.out.println(sheep2);
		System.out.println(sheep3);
		System.out.println(sheep4);
		System.out.println(sheep5);
		//...
	}

}

7.3 传统的方式的优缺点

7.4 原型模式-基本介绍

7.5 原型模式原理结构图-uml类图

7.6 原型模式解决克隆羊问题的应用实例

package com.atguigu.prototype.improve;


public class Sheep implements Cloneable {
	private String name;
	private int age;
	private String color;
	private String address = "蒙古羊";
	public Sheep(String name, int age, String color) {
		super();
		this.name = name;
		this.age = age;
		this.color = color;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	
		
	@Override
	public String toString() {
		return "Sheep [name=" + name + ", age=" + age + ", color=" + color + ", address=" + address + "]";
	}
	//克隆该实例，使用默认的clone方法来完成
	@Override
	protected Object clone()  {
		
		Sheep sheep = null;
		try {
			sheep = (Sheep)super.clone();
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println(e.getMessage());
		}
		// TODO Auto-generated method stub
		return sheep;
	}
	
}

package com.atguigu.prototype.improve;


public class Client {

	public static void main(String[] args) {
		System.out.println("原型模式完成对象的创建");
		// TODO Auto-generated method stub
		Sheep sheep = new Sheep("tom", 1, "白色");
			
		Sheep sheep2 = (Sheep)sheep.clone(); //克隆
		Sheep sheep3 = (Sheep)sheep.clone(); //克隆
		Sheep sheep4 = (Sheep)sheep.clone(); //克隆
		Sheep sheep5 = (Sheep)sheep.clone(); //克隆
		
		System.out.println("sheep2 =" + sheep2 );
		System.out.println("sheep3 =" + sheep3 );
		System.out.println("sheep4 =" + sheep4 );
		System.out.println("sheep5 =" + sheep5 );
	}
}

7.7 原型模式在Spring框架中源码分析★

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xmlns:p="http://www.springframework.org/schema/p"
	xmlns:util="http://www.springframework.org/schema/util"
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/util http://www.springframework.org/schema/util/spring-util-4.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-4.0.xsd">

 <!-- 这里我们的 scope="prototype" 即 原型模式来创建 -->
<bean id="id01" class="com.atguigu.spring.bean.Monster" scope="prototype"/>
 
</beans>

package com.atguigu.spring.test;

import org.springframework.context.ApplicationContext;
import org.springframework.context.support.ClassPathXmlApplicationContext;

public class ProtoType {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ApplicationContext applicationContext = new ClassPathXmlApplicationContext("beans.xml");
		// 获取monster[通过id获取monster]
		Object bean = applicationContext.getBean("id01");
		System.out.println("bean" + bean); // 输出 "牛魔王" .....
		
		Object bean2 = applicationContext.getBean("id01");
		
		System.out.println("bean2" + bean2); //输出 "牛魔王" .....

		System.out.println(bean == bean2); // false
		
		// ConfigurableApplicationContext
	}

}

源码追踪

。。。。。。

7.8 深入讨论-浅拷贝和深拷贝

Object.Clone()方法默认情况下是浅拷贝

package com.atguigu.prototype.improve;

public class Sheep implements Cloneable {
	private String name;
	private int age;
	private String color;
	private String address = "蒙古羊";
	public Sheep friend; //是对象, 克隆是会如何处理？默认是浅拷贝
	public Sheep(String name, int age, String color) {
		super();
		this.name = name;
		this.age = age;
		this.color = color;
	}
	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}
	public String getColor() {
		return color;
	}
	public void setColor(String color) {
		this.color = color;
	}
	
		
	@Override
	public String toString() {
		return "Sheep [name=" + name + ", age=" + age + ", color=" + color + ", address=" + address + "]";
	}
	//克隆该实例，使用默认的clone方法来完成
	@Override
	protected Object clone()  {
		
		Sheep sheep = null;
		try {
			sheep = (Sheep)super.clone();
		} catch (Exception e) {
			// TODO: handle exception
			System.out.println(e.getMessage());
		}
		// TODO Auto-generated method stub
		return sheep;
	}
		
}

package com.atguigu.prototype.improve;

public class Client {

	public static void main(String[] args) {
		System.out.println("原型模式完成对象的创建");
		// TODO Auto-generated method stub
		Sheep sheep = new Sheep("tom", 1, "白色");
		
		sheep.friend = new Sheep("jack", 2, "黑色");
		
		Sheep sheep2 = (Sheep)sheep.clone(); //克隆
		Sheep sheep3 = (Sheep)sheep.clone(); //克隆
		Sheep sheep4 = (Sheep)sheep.clone(); //克隆
		Sheep sheep5 = (Sheep)sheep.clone(); //克隆
		
		System.out.println("sheep2 =" + sheep2 + "sheep2.friend=" + sheep2.friend.hashCode());
		System.out.println("sheep3 =" + sheep3 + "sheep3.friend=" + sheep3.friend.hashCode());
		System.out.println("sheep4 =" + sheep4 + "sheep4.friend=" + sheep4.friend.hashCode());
		System.out.println("sheep5 =" + sheep5 + "sheep5.friend=" + sheep5.friend.hashCode());
	}
}

Object.clone()方法默认为浅拷贝

7.9 深拷贝应用实例

package com.atguigu.prototype.deepclone;

import java.io.Serializable;

public class DeepCloneableTarget implements Serializable, Cloneable {
	
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	private String cloneName;

	private String cloneClass;

	//构造器
	public DeepCloneableTarget(String cloneName, String cloneClass) {
		this.cloneName = cloneName;
		this.cloneClass = cloneClass;
	}

	//因为该类的属性，都是String , 因此我们这里使用默认的clone完成即可
	@Override
	protected Object clone() throws CloneNotSupportedException {
		return super.clone();
	}
}

package com.atguigu.prototype.deepclone;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class DeepProtoType implements Serializable, Cloneable{
	
	public String name; //String 属性
	public DeepCloneableTarget deepCloneableTarget;// 引用类型
	public DeepProtoType() {
		super();
	}
	
	//深拷贝 - 方式 1 使用clone 方法
	@Override
	protected Object clone() throws CloneNotSupportedException {
		
		Object deep = null;
		//这里完成对基本数据类型(属性)和String的克隆
		deep = super.clone(); 
		//对引用类型的属性，进行单独处理
		DeepProtoType deepProtoType = (DeepProtoType)deep;
		deepProtoType.deepCloneableTarget  = (DeepCloneableTarget)deepCloneableTarget.clone();
		
		// TODO Auto-generated method stub
		return deepProtoType;
	}
	
	//深拷贝 - 方式2 通过对象的序列化实现 (推荐)	
	public Object deepClone() {
		
		//创建流对象
		ByteArrayOutputStream bos = null;
		ObjectOutputStream oos = null;
		ByteArrayInputStream bis = null;
		ObjectInputStream ois = null;
		
		try {	
			//序列化
			bos = new ByteArrayOutputStream();
			oos = new ObjectOutputStream(bos);
			oos.writeObject(this); //当前这个对象以对象流的方式输出
			
			//反序列化
			bis = new ByteArrayInputStream(bos.toByteArray());
			ois = new ObjectInputStream(bis);
			DeepProtoType copyObj = (DeepProtoType)ois.readObject();
			
			return copyObj;
			
		} catch (Exception e) {
			// TODO: handle exception
			e.printStackTrace();
			return null;
		} finally {
			//关闭流
			try {
				bos.close();
				oos.close();
				bis.close();
				ois.close();
			} catch (Exception e2) {
				// TODO: handle exception
				System.out.println(e2.getMessage());
			}
		}	
	}	
}

客户端

package com.atguigu.prototype.deepclone;

public class Client {

	public static void main(String[] args) throws Exception {
		// TODO Auto-generated method stub
		DeepProtoType p = new DeepProtoType();
		p.name = "宋江";
		p.deepCloneableTarget = new DeepCloneableTarget("大牛", "小牛");
		
		//方式1 完成深拷贝
		
//		DeepProtoType p2 = (DeepProtoType) p.clone();
//		
//		System.out.println("p.name=" + p.name + "p.deepCloneableTarget=" + p.deepCloneableTarget.hashCode());
//		System.out.println("p2.name=" + p.name + "p2.deepCloneableTarget=" + p2.deepCloneableTarget.hashCode());
	
		//方式2 完成深拷贝
		DeepProtoType p2 = (DeepProtoType) p.deepClone();
		
		System.out.println("p.name=" + p.name + "p.deepCloneableTarget=" + p.deepCloneableTarget.hashCode());
		System.out.println("p2.name=" + p.name + "p2.deepCloneableTarget=" + p2.deepCloneableTarget.hashCode());
	
	}
}

方式1-使用重写clone()方法实现深拷贝：对引用类型的属性，进行单独处理

方式2-使用序列化来实现深拷贝：当前这个对象以对象流的方式输出，再以对象流的方式读入（读入的时候就拷贝了一份）

方式1则需要对引用类型的属性，进行单独处理，每有一个则处理一次，即：调用一次clone()；方式2的优势在于拷贝的时候传入this，对整个对象进行拷贝处理（将this以对象流的方式先输出后输入）

7.10 原型模式的注意事项和细节

第8章 4建造者模式(builder)

8.1 盖房项目需求

8.2 传统方式解决盖房需求

package com.atguigu.builder;

public abstract class AbstractHouse {
	
	//打地基
	public abstract void buildBasic();
	//砌墙
	public abstract void buildWalls();
	//封顶
	public abstract void roofed();
	
	public void build() {
		buildBasic();
		buildWalls();
		roofed();
	}
	
}

package com.atguigu.builder;

public class CommonHouse extends AbstractHouse {

	@Override
	public void buildBasic() {
		// TODO Auto-generated method stub
		System.out.println(" 普通房子打地基 ");
	}

	@Override
	public void buildWalls() {
		// TODO Auto-generated method stub
		System.out.println(" 普通房子砌墙 ");
	}

	@Override
	public void roofed() {
		// TODO Auto-generated method stub
		System.out.println(" 普通房子封顶 ");
	}

}

客户端

package com.atguigu.builder;

public class Client {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		CommonHouse commonHouse = new CommonHouse();
		commonHouse.build();
	}

}

8.3 传统方式的问题分析

8.4 建造者模式基本介绍

8.5 建造者模式的四个角色

8.6 建造者模式原理类图

8.7 建造者模式解决盖房需求应用实例

package com.atguigu.builder.improve;

//产品->Product
@Data
public class House {
	private String baise;
	private String wall;
	private String roofed;
}

package com.atguigu.builder.improve;


// 抽象的建造者
public abstract class HouseBuilder {

	protected House house = new House();
	
	//将建造的流程写好, 抽象的方法
	public abstract void buildBasic();
	public abstract void buildWalls();
	public abstract void roofed();
	
	//建造房子好， 将产品(房子) 返回
	public House buildHouse() {
		return house;
	}
	
}

package com.atguigu.builder.improve;

public class CommonHouse extends HouseBuilder {

	@Override
	public void buildBasic() {
		System.out.println(" 普通房子打地基5米 ");
	}

	@Override
	public void buildWalls() {
		System.out.println(" 普通房子砌墙10cm ");
	}

	@Override
	public void roofed() {
		System.out.println(" 普通房子屋顶 ");
	}

}

package com.atguigu.builder.improve;

public class HighBuilding extends HouseBuilder {

	@Override
	public void buildBasic() {
		System.out.println(" 高楼的打地基100米 ");
	}

	@Override
	public void buildWalls() {
		System.out.println(" 高楼的砌墙20cm ");
	}

	@Override
	public void roofed() {
		System.out.println(" 高楼的透明屋顶 ");
	}

}

package com.atguigu.builder.improve;

//指挥者，这里去指定制作流程，返回产品
public class HouseDirector {
	
	HouseBuilder houseBuilder = null;

	//构造器传入 houseBuilder
	public HouseDirector(HouseBuilder houseBuilder) {
		this.houseBuilder = houseBuilder;
	}

	//通过setter 传入 houseBuilder
	public void setHouseBuilder(HouseBuilder houseBuilder) {
		this.houseBuilder = houseBuilder;
	}
	
	//如何处理建造房子的流程，交给指挥者
	public House constructHouse() {
		houseBuilder.buildBasic();
		houseBuilder.buildWalls();
		houseBuilder.roofed();
		return houseBuilder.buildHouse();
	}
	
}

package com.atguigu.builder.improve;

public class Client {
	public static void main(String[] args) {
		
		//盖普通房子
		CommonHouse commonHouse = new CommonHouse();
		//准备创建房子的指挥者
		HouseDirector houseDirector = new HouseDirector(commonHouse);
		
		//完成盖房子，返回产品(普通房子)
		House house = houseDirector.constructHouse();
		
		//System.out.println("输出流程");
		
		System.out.println("--------------------------");
		//盖高楼
		HighBuilding highBuilding = new HighBuilding();
		//重置建造者
		houseDirector.setHouseBuilder(highBuilding);
		//完成盖房子，返回产品(高楼)
		houseDirector.constructHouse();
		
	}
}

8.8 建造者模式在JDK的应用和源码分析★

8.9 建造者模式的注意事项和细节

结构型模式：

第9章 5适配器设计模式(Adapter)

9.1 现实生活中的适配器例子

9.2 基本介绍

9.3 工作原理

9.4 类适配器模式

package com.atguigu.adapter.classadapter;

//被适配的类
public class Voltage220V {
	//输出220V的电压
	public int output220V() {
		int src = 220;
		System.out.println("电压=" + src + "伏");
		return src;
	}
}

package com.atguigu.adapter.classadapter;

//适配接口
public interface IVoltage5V {
	public int output5V();
}

package com.atguigu.adapter.classadapter;

//适配器类
public class VoltageAdapter extends Voltage220V implements IVoltage5V {

	@Override
	public int output5V() {
		//获取到220V电压
		int srcV = output220V();
		int dstV = srcV / 44 ; //转成 5v
		return dstV;
	}

}

package com.atguigu.adapter.classadapter;

public class Phone {

	//充电
	public void charging(IVoltage5V iVoltage5V) {
		if(iVoltage5V.output5V() == 5) {
			System.out.println("电压为5V, 可以充电~~");
		} else if (iVoltage5V.output5V() > 5) {
			System.out.println("电压大于5V, 不能充电~~");
		}
	}
}

package com.atguigu.adapter.classadapter;

public class Client {

	public static void main(String[] args) {
		System.out.println(" === 类适配器模式 ====");
		Phone phone = new Phone();
		phone.charging(new VoltageAdapter());
	}

}

9.5 对象适配器模式

package com.atguigu.adapter.objectadapter;

//被适配的类
public class Voltage220V {
	//输出220V的电压，不变
	public int output220V() {
		int src = 220;
		System.out.println("电压=" + src + "伏");
		return src;
	}
}

package com.atguigu.adapter.objectadapter;


//适配接口
public interface IVoltage5V {
	public int output5V();
}

package com.atguigu.adapter.objectadapter;

//适配器类
public class VoltageAdapter  implements IVoltage5V {

	private Voltage220V voltage220V; // 关联关系-聚合
	
	
	//通过构造器，传入一个 Voltage220V 实例
	public VoltageAdapter(Voltage220V voltage220v) {
		
		this.voltage220V = voltage220v;
	}

	@Override
	public int output5V() {
		
		int dst = 0;
		if(null != voltage220V) {
			int src = voltage220V.output220V();//获取220V 电压
			System.out.println("使用对象适配器，进行适配~~");
			dst = src / 44;
			System.out.println("适配完成，输出的电压为=" + dst);
		}
		
		return dst;
	}
}

package com.atguigu.adapter.objectadapter;

public class Phone {

	//充电
	public void charging(IVoltage5V iVoltage5V) {
		if(iVoltage5V.output5V() == 5) {
			System.out.println("电压为5V, 可以充电~~");
		} else if (iVoltage5V.output5V() > 5) {
			System.out.println("电压大于5V, 不能充电~~");
		}
	}
}

package com.atguigu.adapter.objectadapter;

public class Client {

	public static void main(String[] args) {
		System.out.println(" === 对象适配器模式 ====");
		Phone phone = new Phone();
		phone.charging(new VoltageAdapter(new Voltage220V()));
	}

}

9.6 接口适配器模式

2）该抽象类的子类是以匿名内部类的方式实现的

package com.atguigu.adapter.interfaceadapter;

public interface Interface4 {
	public void m1();
	public void m2();
	public void m3();
	public void m4();
}

package com.atguigu.adapter.interfaceadapter;

//在AbsAdapter 我们将 Interface4 的方法进行默认实现
public abstract class AbsAdapter implements Interface4 {

	//默认实现
	public void m1() {

	}

	public void m2() {

	}

	public void m3() {

	}

	public void m4() {

	}
}

客户端

package com.atguigu.adapter.interfaceadapter;

public class Client {
	public static void main(String[] args) {
		
		AbsAdapter absAdapter = new AbsAdapter() {
			//只需要去覆盖我们 需要使用 接口方法
			@Override
			public void m1() {
				System.out.println("使用了m1的方法");
			}
		};
		
		absAdapter.m1();
	}
}

9.7 适配器模式在SpringMVC框架应用的源码剖析★

DispatchServlet.doDispatch()

DispatchServlet.getHandlerAdapter() 【HandlerAdapter】

Controller

package com.atguigu.spring.springmvc;

//多种Controller实现  
public interface Controller {

}

class HttpController implements Controller {
	public void doHttpHandler() {
		System.out.println("http...");
	}
}

class SimpleController implements Controller {
	public void doSimplerHandler() {
		System.out.println("simple...");
	}
}

class AnnotationController implements Controller {
	public void doAnnotationHandler() {
		System.out.println("annotation...");
	}
}

HandlerAdapter

package com.atguigu.spring.springmvc;

///定义一个Adapter接口 
public interface HandlerAdapter {
	public boolean supports(Object handler);

	public void handle(Object handler);
}

// 多种适配器类

class SimpleHandlerAdapter implements HandlerAdapter {

	public void handle(Object handler) {
		((SimpleController) handler).doSimplerHandler();
	}

	public boolean supports(Object handler) {
		return (handler instanceof SimpleController);
	}

}

class HttpHandlerAdapter implements HandlerAdapter {

	public void handle(Object handler) {
		((HttpController) handler).doHttpHandler();
	}

	public boolean supports(Object handler) {
		return (handler instanceof HttpController);
	}

}

class AnnotationHandlerAdapter implements HandlerAdapter {

	public void handle(Object handler) {
		((AnnotationController) handler).doAnnotationHandler();
	}

	public boolean supports(Object handler) {

		return (handler instanceof AnnotationController);
	}

}

DispatchServlet

package com.atguigu.spring.springmvc;

import java.util.ArrayList;
import java.util.List;

public class DispatchServlet {

	public static List<HandlerAdapter> handlerAdapters = new ArrayList<HandlerAdapter>();

	public DispatchServlet() {
		handlerAdapters.add(new AnnotationHandlerAdapter());
		handlerAdapters.add(new HttpHandlerAdapter());
		handlerAdapters.add(new SimpleHandlerAdapter());
	}

	public void doDispatch() {

		// 此处模拟SpringMVC从request取handler的对象，
		// 适配器可以获取到希望的Controller
		 HttpController controller = new HttpController();
		// AnnotationController controller = new AnnotationController();
		//SimpleController controller = new SimpleController();
		// 得到对应适配器
		HandlerAdapter adapter = getHandler(controller);
		// 通过适配器执行对应的controller对应方法
		adapter.handle(controller);

	}

	public HandlerAdapter getHandler(Controller controller) {
		//遍历：根据得到的controller(handler), 返回对应适配器
		for (HandlerAdapter adapter : this.handlerAdapters) {
			if (adapter.supports(controller)) {
				return adapter;
			}
		}
		return null;
	}

	public static void main(String[] args) {
		new DispatchServlet().doDispatch(); // http...
	}

}

9.8 适配器模式的注意事项和细节

第10章 6桥接模式(Bridge)

10.1 手机操作问题

10.2 传统方案解决手机操作问题

10.3 传统方案解决手机操作问题分析

10.4 桥接模式(Bridge)-基本介绍

10.5 桥接模式(Bridge)-原理类图

10.6 桥接模式解决手机操作问题

FoldedPhone类调用open()方法，实际调用父类Phone.open()方法，父类Phone.open()方法实际调用具体的Vivo.open()方法。

这里Phone就像一个桥一样，将整个通路连接，从抽象层连接到具体实现。 （P68,14'）

package com.atguigu.bridge;

//接口
public interface Brand {
	void open();
	void close();
	void call();
}

package com.atguigu.bridge;

public class XiaoMi implements Brand {

	@Override
	public void open() {
		System.out.println(" 小米手机开机 ");
	}

	@Override
	public void close() {
		System.out.println(" 小米手机关机 ");
	}

	@Override
	public void call() {
		System.out.println(" 小米手机打电话 ");
	}

}

package com.atguigu.bridge;

public class Vivo implements Brand {

	@Override
	public void open() {
		System.out.println(" Vivo手机开机 ");
	}

	@Override
	public void close() {
		System.out.println(" Vivo手机关机 ");
	}

	@Override
	public void call() {
		System.out.println(" Vivo手机打电话 ");
	}

}

package com.atguigu.bridge;

public abstract class Phone {
	
	//组合品牌
	private Brand brand;

	//构造器
	public Phone(Brand brand) {
		super();
		this.brand = brand;
	}
	
	protected void open() {
		this.brand.open();
	}
	protected void close() {
		brand.close();
	}
	protected void call() {
		brand.call();
	}
	
}

package com.atguigu.bridge;


//折叠式手机类，继承 抽象类 Phone
public class FoldedPhone extends Phone {

	//构造器
	public FoldedPhone(Brand brand) {
		super(brand);
	}
	
	public void open() {
		super.open();
		System.out.println(" 折叠样式手机 ");
	}
	
	public void close() {
		super.close();
		System.out.println(" 折叠样式手机 ");
	}
	
	public void call() {
		super.call();
		System.out.println(" 折叠样式手机 ");
	}
}

package com.atguigu.bridge;

//直立式手机类，继承 抽象类 Phone
public class UpRightPhone extends Phone {
	
		//构造器
		public UpRightPhone(Brand brand) {
			super(brand);
		}
		
		public void open() {
			super.open();
			System.out.println(" 直立样式手机 ");
		}
		
		public void close() {
			super.close();
			System.out.println(" 直立样式手机 ");
		}
		
		public void call() {
			super.call();
			System.out.println(" 直立样式手机 ");
		}
}

客户端

package com.atguigu.bridge;

public class Client {

	public static void main(String[] args) {
		
		//获取折叠式手机 (样式 + 品牌 )
		
		Phone phone1 = new FoldedPhone(new XiaoMi());
		
		phone1.open();
		phone1.call();
		phone1.close();
		
		System.out.println("=======================");
		
		Phone phone2 = new FoldedPhone(new Vivo());
		
		phone2.open();
		phone2.call();
		phone2.close();
		
		System.out.println("==============");
		
		UpRightPhone phone3 = new UpRightPhone(new XiaoMi());
		
		phone3.open();
		phone3.call();
		phone3.close();
		
		System.out.println("==============");
		
		UpRightPhone phone4 = new UpRightPhone(new Vivo());
		
		phone4.open();
		phone4.call();
		phone4.close();
	}

}

10.7 桥接模式在JDBC的源码剖析★

10.8 桥接模式的注意事项和细节

10.9 桥接模式其他应用场景

第11章 7装饰者设计模式(Decorator)★

11.1 星巴克咖啡订单项目(咖啡馆)

11.2 方案1-解决星巴克咖啡订单项目(较差)

11.3 方案1-解决星巴克咖啡订单问题分析

11.4 方案2-解决星巴克咖啡订单(好点)

11.5 方案2-解决星巴克咖啡订单问题分析

11.6 装饰者模式定义

11.7 装饰者模式原理

11.8 装饰者模式解决星巴克咖啡订单

11.9 装饰者模式下的订单:2份巧克力+1份牛奶的LongBlack

11.10 装饰者模式咖啡订单项目应用实例

抽象类Drink

package com.atguigu.decorator;

public abstract class Drink {

	public String des; // 描述
	private float price = 0.0f;
	public String getDes() {
		return des;
	}
	public void setDes(String des) {
		this.des = des;
	}
	public float getPrice() {
		return price;
	}
	public void setPrice(float price) {
		this.price = price;
	}
	
	//计算费用的抽象方法
	//子类来实现
	public abstract float cost();
}

单品咖啡父类，继承Drink

package com.atguigu.decorator;

public class Coffee  extends Drink {

	@Override
	public float cost() {
		return super.getPrice();
	}

	
}

具体的单品咖啡， 继承单品咖啡父类

package com.atguigu.decorator;

public class Espresso extends Coffee {
	
	public Espresso() {
		setDes(" 意大利咖啡 ");
		setPrice(6.0f);
	}
}

package com.atguigu.decorator;

public class LongBlack extends Coffee {

	public LongBlack() {
		setDes(" longblack ");
		setPrice(5.0f);
	}
}

package com.atguigu.decorator;

public class ShortBlack extends Coffee{
	
	public ShortBlack() {
		setDes(" shortblack ");
		setPrice(4.0f);
	}
}

package com.atguigu.decorator;

public class DeCaf extends Coffee {

	public DeCaf() {
		setDes(" 无因咖啡 ");
		setPrice(1.0f);
	}
}

装饰者Decorator，继承Drink

package com.atguigu.decorator;

public class Decorator extends Drink {
	private Drink obj;
	
	public Decorator(Drink obj) { //组合
		this.obj = obj;
	}
	
	@Override
	public float cost() {
		// getPrice 自己价格
		return super.getPrice() + obj.cost();
	}
	
	@Override
	public String getDes() {
		// obj.getDes() 输出被装饰者的信息
        // des=super.des; getPrice()=super.getPrice(); 都是从父类获得
		return des + " " + getPrice() + " && " + obj.getDes();
	}
	
}

具体的装饰者，继承Decorator

package com.atguigu.decorator;

//具体的Decorator， 这里就是调味品
public class Chocolate extends Decorator {

	public Chocolate(Drink obj) {
		super(obj);
		setDes(" 巧克力 ");
		setPrice(3.0f); // 调味品 的价格
	}
}

package com.atguigu.decorator;

public class Milk extends Decorator {

	public Milk(Drink obj) {
		super(obj);
		setDes(" 牛奶 ");
		setPrice(2.0f); 
	}
}

package com.atguigu.decorator;

public class Soy extends Decorator{

	public Soy(Drink obj) {
		super(obj);
		setDes(" 豆浆  ");
		setPrice(1.5f);
	}
}

客户端

package com.atguigu.decorator;

public class CoffeeBar {

	public static void main(String[] args) {
		// 装饰者模式下的订单：2份巧克力+一份牛奶的LongBlack

		// 1. 点一份 LongBlack
		Drink order = new LongBlack();
		System.out.println("费用1=" + order.cost());
		System.out.println("描述=" + order.getDes());

		// 2. order 加入一份牛奶
		order = new Milk(order);

		System.out.println("order 加入一份牛奶 费用 =" + order.cost());
		System.out.println("order 加入一份牛奶 描述 = " + order.getDes());

		// 3. order 加入一份巧克力

		order = new Chocolate(order);

		System.out.println("order 加入一份牛奶 加入一份巧克力  费用 =" + order.cost());
		System.out.println("order 加入一份牛奶 加入一份巧克力 描述 = " + order.getDes());

		// 3. order 加入一份巧克力

		order = new Chocolate(order);

		System.out.println("order 加入一份牛奶 加入2份巧克力   费用 =" + order.cost());
		System.out.println("order 加入一份牛奶 加入2份巧克力 描述 = " + order.getDes());
	
		System.out.println("===========================");
		
		Drink order2 = new DeCaf();
		
		System.out.println("order2 无因咖啡  费用 =" + order2.cost());
		System.out.println("order2 无因咖啡 描述 = " + order2.getDes());
		
		order2 = new Milk(order2);
		
		System.out.println("order2 无因咖啡 加入一份牛奶  费用 =" + order2.cost());
		System.out.println("order2 无因咖啡 加入一份牛奶 描述 = " + order2.getDes());

	}
}

11.11 装饰者模式在JDK应用的源码分析★

package com.atguigu.jdk;

import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.InputStream;

public class Decorator {

	public static void main(String[] args) throws Exception{
		
		//说明
		//1. InputStream 是抽象类, 类似我们前面讲的 Drink
		//2. FileInputStream 是  InputStream 子类，类似我们前面的 DeCaf, LongBlack
		//3. FilterInputStream  是  InputStream 子类：类似我们前面 的 Decorator 修饰者
		//4. DataInputStream 是 FilterInputStream 子类，具体的修饰者，类似前面的 Milk, Soy 等
		//5. FilterInputStream 类 有  protected volatile InputStream in; 即含被装饰者
		//6. 分析得出在jdk 的io体系中，就是使用装饰者模式
		
		DataInputStream dis = new DataInputStream(new FileInputStream("d:\\abc.txt"));
		System.out.println(dis.read());
		dis.close();
	}

}

第12章 8组合模式(Composite)

12.1 看一个学校院系展示需求

12.2 传统方案解决学校院系展示(类图)

12.3 传统方案解决学校院系展示存在的问题分析

12.4 组合模式基本介绍

12.5 组合模式原理类图

12.6 组合模式解决学校院系展示的应用实例

package com.atguigu.composite;

@Data
public abstract class OrganizationComponent {

	private String name; // 名字
	private String des; // 说明
	
	protected  void add(OrganizationComponent organizationComponent) {
		//默认实现
		throw new UnsupportedOperationException();
	}
	
	protected  void remove(OrganizationComponent organizationComponent) {
		//默认实现
		throw new UnsupportedOperationException();
	}

	//构造器
	public OrganizationComponent(String name, String des) {
		super();
		this.name = name;
		this.des = des;
	}
	
	//方法print, 做成抽象的, 子类都需要实现
	protected abstract void print();
	
}

package com.atguigu.composite;

import java.util.ArrayList;
import java.util.List;

//University 就是 Composite , 可以管理College
public class University extends OrganizationComponent {

	List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

	// 构造器
	public University(String name, String des) {
		super(name, des);
	}

	// 重写add
	@Override
	protected void add(OrganizationComponent organizationComponent) {
		organizationComponents.add(organizationComponent);
	}

	// 重写remove
	@Override
	protected void remove(OrganizationComponent organizationComponent) {
		organizationComponents.remove(organizationComponent);
	}

	@Override
	public String getName() {
		return super.getName();
	}

	@Override
	public String getDes() {
		return super.getDes();
	}

	// print方法，就是输出University 包含的学院
	@Override
	protected void print() {
		System.out.println("--------------" + getName() + "--------------");
		//遍历 organizationComponents 
		for (OrganizationComponent organizationComponent : organizationComponents) {
			organizationComponent.print();
		}
	}
}

package com.atguigu.composite;

import java.util.ArrayList;
import java.util.List;

public class College extends OrganizationComponent {

	//List 中 存放的Department
	List<OrganizationComponent> organizationComponents = new ArrayList<OrganizationComponent>();

	// 构造器
	public College(String name, String des) {
		super(name, des);
	}

	// 重写add
	@Override
	protected void add(OrganizationComponent organizationComponent) {
		//  将来实际业务中，Colleage 的 add 和  University add 不一定完全一样
		organizationComponents.add(organizationComponent);
	}

	// 重写remove
	@Override
	protected void remove(OrganizationComponent organizationComponent) {
		organizationComponents.remove(organizationComponent);
	}

	@Override
	public String getName() {
		return super.getName();
	}

	@Override
	public String getDes() {
		return super.getDes();
	}

	// print方法，就是输出University 包含的学院
	@Override
	protected void print() {
		System.out.println("--------------" + getName() + "--------------");
		//遍历 organizationComponents 
		for (OrganizationComponent organizationComponent : organizationComponents) {
			organizationComponent.print();
		}
	}
}

package com.atguigu.composite;

public class Department extends OrganizationComponent {

	//没有集合
	
	public Department(String name, String des) {
		super(name, des);
	}

	//add , remove 就不用写了，因为他是叶子节点
	
	@Override
	public String getName() {
		return super.getName();
	}
	
	@Override
	public String getDes() {
		return super.getDes();
	}
	
	@Override
	protected void print() {
		System.out.println(getName());
	}

}

客户端

package com.atguigu.composite;

public class Client {

	public static void main(String[] args) {

		//从大到小创建对象 学校
		OrganizationComponent university = new University("清华大学", " 中国顶级大学 ");
		
		//创建 学院
		OrganizationComponent computerCollege = new College("计算机学院", " 计算机学院 ");
		OrganizationComponent infoEngineercollege = new College("信息工程学院", " 信息工程学院 ");
		
		
		//创建各个学院下面的系(专业)
		//给计算机学院添加专业
		computerCollege.add(new Department("软件工程", " 软件工程不错 "));
		computerCollege.add(new Department("网络工程", " 网络工程不错 "));
		computerCollege.add(new Department("计算机科学与技术", " 计算机科学与技术是老牌的专业 "));
		
		//给信息工程学院添加专业
		infoEngineercollege.add(new Department("通信工程", " 通信工程不好学 "));
		infoEngineercollege.add(new Department("信息工程", " 信息工程好学 "));
		
		//将学院加入到 学校
		university.add(computerCollege);
		university.add(infoEngineercollege);
		
		//university.print();
		infoEngineercollege.print();
	}

}

12.7 组合模式在JDK集合的源码分析★

package com.atguigu.jdk;

import java.util.HashMap;
import java.util.Map;

public class Composite {

	public static void main(String[] args) {
		
		//说明
		//1. Map 就是一个抽象的构建 (类似我们的Component)
		//2. HashMap是一个中间的构建(Composite), 实现/继承了相关方法
		//   put, putall 
		//3. Node 是 HashMap的静态内部类，类似Leaf叶子节点, 这里就没有put, putall
		//   static class Node<K,V> implements Map.Entry<K,V>
		
		Map<Integer,String> hashMap=new HashMap<Integer,String>();
		hashMap.put(0, "东游记");//直接存放叶子节点(Node)
		
		Map<Integer,String> map=new HashMap<Integer,String>();
		map.put(1, "西游记");
		map.put(2, "红楼梦"); //..
		hashMap.putAll(map);
		System.out.println(hashMap);

	}
}

12.8 组合模式的注意事项和细节

第13章 9外观模式(Facade)

13.1 影院管理项目

13.2 传统方式解决影院管理

13.3 传统方式解决影院管理问题分析

13.4 外观模式基本介绍

13.5 外观模式原理类图

13.6 外观模式解决影院管理

13.6.1 传统方式解决影院管理说明

13.6.2 外观模式应用实例

子系统6个

package com.atguigu.facade;

public class DVDPlayer {
	
	//使用单例模式, 使用饿汉式
	private static DVDPlayer instance = new DVDPlayer();
	
	public static DVDPlayer getInstanc() {
		return instance;
	}
	
	public void on() {
		System.out.println(" dvd on ");
	}
	public void off() {
		System.out.println(" dvd off ");
	}
	
	public void play() {
		System.out.println(" dvd is playing ");
	}
	
	//....
	public void pause() {
		System.out.println(" dvd pause ..");
	}
}

package com.atguigu.facade;

public class Popcorn {

	//使用单例模式, 使用饿汉式
	private static Popcorn instance = new Popcorn();
	
	public static Popcorn getInstance() {
		return instance;
	}
	
	public void on() {
		System.out.println(" popcorn on ");
	}
	
	public void off() {
		System.out.println(" popcorn ff ");
	}
	
	public void pop() {
		System.out.println(" popcorn is poping  ");
	}
}

package com.atguigu.facade;

public class Projector {

	//使用单例模式, 使用饿汉式
	private static Projector instance = new Projector();
	
	public static Projector getInstance() {
		return instance;
	}
	
	public void on() {
		System.out.println(" Projector on ");
	}
	
	public void off() {
		System.out.println(" Projector ff ");
	}
	
	public void focus() {
		System.out.println(" Projector is Projector  ");
	}
	
	//...
}

package com.atguigu.facade;

public class Screen {

	//使用单例模式, 使用饿汉式
	private static Screen instance = new Screen();
	
	public static Screen getInstance() {
		return instance;
	}

	public void up() {
		System.out.println(" Screen up ");
	}
	
	public void down() {
		System.out.println(" Screen down ");
	}
}

package com.atguigu.facade;

public class Stereo {

	//使用单例模式, 使用饿汉式
	private static Stereo instance = new Stereo();
	
	public static Stereo getInstance() {
		return instance;
	}
	
	public void on() {
		System.out.println(" Stereo on ");
	}
	
	public void off() {
		System.out.println(" Screen off ");
	}
	
	public void up() {
		System.out.println(" Screen up.. ");
	}
	
	//...
}

package com.atguigu.facade;

public class TheaterLight {

	//使用单例模式, 使用饿汉式
	private static TheaterLight instance = new TheaterLight();

	public static TheaterLight getInstance() {
		return instance;
	}

	public void on() {
		System.out.println(" TheaterLight on ");
	}

	public void off() {
		System.out.println(" TheaterLight off ");
	}

	public void dim() {
		System.out.println(" TheaterLight dim.. ");
	}

	public void bright() {
		System.out.println(" TheaterLight bright.. ");
	}
}

外观类

package com.atguigu.facade;

public class HomeTheaterFacade {
	
	//定义各个子系统对象
	private TheaterLight theaterLight;
	private Popcorn popcorn;
	private Stereo stereo;
	private Projector projector;
	private Screen screen;
	private DVDPlayer dVDPlayer;
	
	
	//构造器
	public HomeTheaterFacade() {
		super();
		this.theaterLight = TheaterLight.getInstance();
		this.popcorn = Popcorn.getInstance();
		this.stereo = Stereo.getInstance();
		this.projector = Projector.getInstance();
		this.screen = Screen.getInstance();
		this.dVDPlayer = DVDPlayer.getInstanc();
	}

	//操作分成 4 步
	
	public void ready() {
		popcorn.on();
		popcorn.pop();
		screen.down();
		projector.on();
		stereo.on();
		dVDPlayer.on();
		theaterLight.dim();
	}
	
	public void play() {
		dVDPlayer.play();
	}
	
	public void pause() {
		dVDPlayer.pause();
	}
	
	public void end() {
		popcorn.off();
		theaterLight.bright();
		screen.up();
		projector.off();
		stereo.off();
		dVDPlayer.off();
	}

}

客户端

package com.atguigu.facade;

public class Client {

	public static void main(String[] args) {
		//这里直接调用。。 很麻烦
		HomeTheaterFacade homeTheaterFacade = new HomeTheaterFacade();
		homeTheaterFacade.ready();
		homeTheaterFacade.play();
		
		homeTheaterFacade.end();
	}

}

13.7 外观模式在MyBatis框架应用的源码分析★

13.8 外观模式的注意事项和细节

第14章 10享元模式(Flyweight)

14.1 展示网站项目需求

14.2 传统方案解决网站展现项目

14.3 传统方案解决网站展现项目-问题分析

14.4 享元模式基本介绍

14.5 享元模式的原理类图

14.6 内部状态和外部状态

14.7 享元模式解决网站展现项目

package com.atguigu.flyweight;

public abstract class WebSite {

	public abstract void use(User user);//抽象方法
}

package com.atguigu.flyweight;

//具体网站
public class ConcreteWebSite extends WebSite {

	//共享的部分，内部状态
	private String type = ""; //网站发布的形式(类型)

	//构造器
	public ConcreteWebSite(String type) {
		
		this.type = type;
	}

	@Override
	public void use(User user) {
		System.out.println("网站的发布形式为:" + type + " 在使用中 .. 使用者是" + user.getName());
	}
}

package com.atguigu.flyweight;

import java.util.HashMap;

// 网站工厂类，根据需要返回压一个网站
public class WebSiteFactory {

	//集合， 充当池的作用
	private HashMap<String, ConcreteWebSite> pool = new HashMap<>();
	
	//根据网站的类型，返回一个网站, 如果没有就创建一个网站，并放入到池中,并返回
	public WebSite getWebSiteCategory(String type) {
		if(!pool.containsKey(type)) {
			//就创建一个网站，并放入到池中
			pool.put(type, new ConcreteWebSite(type));
		}
		
		return (WebSite)pool.get(type);
	}
	
	//获取网站分类的总数 (池中有多少个网站类型)
	public int getWebSiteCount() {
		return pool.size();
	}
}

package com.atguigu.flyweight;

public class User {
	
	private String name;

	
	public User(String name) {
		super();
		this.name = name;
	}

	public String getName() {
		return name;
	}

	public void setName(String name) {
		this.name = name;
	}
	
	
}

客户端

package com.atguigu.flyweight;

public class Client {

	public static void main(String[] args) {

		// 创建一个工厂类
		WebSiteFactory factory = new WebSiteFactory();

		// 客户要一个以新闻形式发布的网站
		WebSite webSite1 = factory.getWebSiteCategory("新闻");

		
		webSite1.use(new User("tom"));

		// 客户要一个以博客形式发布的网站
		WebSite webSite2 = factory.getWebSiteCategory("博客");

		webSite2.use(new User("jack"));

		// 客户要一个以博客形式发布的网站
		WebSite webSite3 = factory.getWebSiteCategory("博客");

		webSite3.use(new User("smith"));

		// 客户要一个以博客形式发布的网站
		WebSite webSite4 = factory.getWebSiteCategory("博客");

		webSite4.use(new User("king"));
		
		System.out.println("网站的分类共=" + factory.getWebSiteCount());
	}

}

14.8 享元模式在JDK-Interger的应用源码分析★

测试案例

package com.atguigu.jdk;

public class FlyWeight {

	public static void main(String[] args) {
		//如果 Integer.valueOf(x) x 在  -128 --- 127 直接，就是使用享元模式返回,如果不在
		//范围内，则仍然 new
		
		//小结:
		//1. 在valueOf 方法中，先判断值是否在 IntegerCache 中，如果不在，就创建新的Integer(new), 否则，就直接从 缓存池返回
		//2. valueOf 方法，就使用到享元模式
		//3. 如果使用valueOf 方法得到一个Integer 实例，范围在 -128 - 127 ，执行速度比 new 快
		
		
		Integer x = Integer.valueOf(127); // 得到 x实例，类型 Integer
		Integer y = new Integer(127); // 得到 y 实例，类型 Integer
		Integer z = Integer.valueOf(127);//..
		Integer w = new Integer(127);
		
		
		
		System.out.println(x.equals(y)); // 大小，true
		System.out.println(x == y ); //  false
		System.out.println(x == z ); // true
		System.out.println(w == x ); // false
		System.out.println(w == y ); // false
		
		
		Integer x1 = Integer.valueOf(200);
		Integer x2 = Integer.valueOf(200);
		System.out.println("x1==x2 " + (x1 == x2)); // false
		
	}

}

源码追踪

14.9 享元模式的注意事项和细节

第15章 11代理模式(Proxy)★

15.1 代理模式的基本介绍

15.2 静态代理(staticproxy)

15.2.1 静态代码模式的基本介绍

15.2.2 应用实例

package com.atguigu.proxy.staticproxy;

//接口
public interface ITeacherDao {
	
	void teach(); // 授课的方法
}

package com.atguigu.proxy.staticproxy;

public class TeacherDao implements ITeacherDao {

	@Override
	public void teach() {
		System.out.println(" 老师授课中  。。。。。");
	}
}

package com.atguigu.proxy.staticproxy;

//代理对象,静态代理
public class TeacherDaoProxy implements ITeacherDao{
	
	private ITeacherDao target; // 目标对象，通过接口来聚合
	
	//构造器
	public TeacherDaoProxy(ITeacherDao target) {
		this.target = target;
	}

	@Override
	public void teach() {
		System.out.println("开始代理  完成某些操作。。。。。 ");//方法
		target.teach();
		System.out.println("提交。。。。。");//方法
	}

}

客户端

package com.atguigu.proxy.staticproxy;

public class Client {

	public static void main(String[] args) {
		//创建目标对象(被代理对象)
		TeacherDao teacherDao = new TeacherDao();
		
		//创建代理对象, 同时将被代理对象传递给代理对象
		TeacherDaoProxy teacherDaoProxy = new TeacherDaoProxy(teacherDao);
		
		//通过代理对象，调用到被代理对象的方法
		//即：执行的是代理对象的方法，代理对象再去调用目标对象的方法 
		teacherDaoProxy.teach();
	}
}

15.2.3 静态代理优缺点

15.3 动态代理(dynamicproxy)

15.3.1 动态代理模式的基本介绍

15.3.2 JDK中生成代理对象的API

15.3.3 动态代理应用实例

package com.atguigu.proxy.dynamic;

//接口
public interface ITeacherDao {

	void teach(); // 授课方法
	void sayHello(String name);
}

package com.atguigu.proxy.dynamic;

public class TeacherDao implements ITeacherDao {

	@Override
	public void teach() {
		System.out.println(" 老师授课中.... ");
	}

	@Override
	public void sayHello(String name) {
		System.out.println("hello " + name);
	}
	
}

package com.atguigu.proxy.dynamic;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;

public class ProxyFactory {

    //维护一个目标对象 , Object
    private Object target;

    //构造器 ， 对target 进行初始化
    public ProxyFactory(Object target) {

        this.target = target;
    }

    //给目标对象 生成一个代理对象
    public Object getProxyInstance() {

        //说明
        /*
         *  public static Object newProxyInstance(ClassLoader loader,
                                          Class<?>[] interfaces,
                                          InvocationHandler h)

            //1. ClassLoader loader ： 指定当前目标对象使用的类加载器, 获取加载器的方法固定
            //2. Class<?>[] interfaces: 目标对象实现的接口类型，使用泛型方法确认类型
            //3. InvocationHandler h : 事情处理，执行目标对象的方法时，会触发事情处理器方法, 会把当前执行的目标对象方法作为参数传入
         */
        return Proxy.newProxyInstance(target.getClass().getClassLoader(),
                target.getClass().getInterfaces(),
                new InvocationHandler() {

                    @Override
                    public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                        System.out.println("JDK代理开始~~");
                        //反射机制调用目标对象的方法
                        Object returnVal = method.invoke(target, args);
                        System.out.println("JDK代理提交");
                        return returnVal;
                    }
                });
    }

}

客户端

package com.atguigu.proxy.dynamic;

public class Client {

	public static void main(String[] args) {
		//创建目标对象
		ITeacherDao target = new TeacherDao();
		
		//给目标对象，创建代理对象, 可以转成 ITeacherDao
		ITeacherDao proxyInstance = (ITeacherDao)new ProxyFactory(target).getProxyInstance();
	
		// proxyInstance=class com.sun.proxy.$Proxy0 内存中动态生成了代理对象
		System.out.println("proxyInstance=" + proxyInstance.getClass());
		
		//通过代理对象，调用目标对象的方法
		//proxyInstance.teach();
		
		proxyInstance.sayHello(" tom ");
	}

}

源码追踪

调用无参数的方法

调用有参数的方法

15.4 Cglib代理

15.4.1 Cglib代理模式的基本介绍

15.4.2 Cglib代理模式实现步骤

15.4.3 Cglib代理模式应用实例

package com.atguigu.proxy.cglib;

public class TeacherDao {

	public String teach() {
		System.out.println(" 老师授课中  ， 我是cglib代理，不需要实现接口 ");
		return "hello";
	}
}

package com.atguigu.proxy.cglib;

import java.lang.reflect.Method;

import net.sf.cglib.proxy.Enhancer;
import net.sf.cglib.proxy.MethodInterceptor;
import net.sf.cglib.proxy.MethodProxy;

public class ProxyFactory implements MethodInterceptor {

	//维护一个目标对象
	private Object target;
	
	//构造器，传入一个被代理的对象
	public ProxyFactory(Object target) {
		this.target = target;
	}

	//返回一个代理对象:  是 target 对象的代理对象
	public Object getProxyInstance() {
		//1. 创建一个工具类
		Enhancer enhancer = new Enhancer();
		//2. 设置父类
		enhancer.setSuperclass(target.getClass());
		//3. 设置回调函数
		enhancer.setCallback(this);
		//4. 创建子类对象，即代理对象
		return enhancer.create();
		
	}

	//重写  intercept 方法，会调用目标对象的方法
	@Override
	public Object intercept(Object arg0, Method method, Object[] args, MethodProxy arg3) throws Throwable {
		System.out.println("Cglib代理模式 ~~ 开始");
		Object returnVal = method.invoke(target, args);
		System.out.println("Cglib代理模式 ~~ 提交");
		return returnVal;
	}

}

客户端

package com.atguigu.proxy.cglib;

public class Client {

	public static void main(String[] args) {
		//创建目标对象
		TeacherDao target = new TeacherDao();
		//获取到代理对象，并且将目标对象传递给代理对象
		TeacherDao proxyInstance = (TeacherDao)new ProxyFactory(target).getProxyInstance();

		//执行代理对象的方法，触发intecept 方法，从而实现 对目标对象的调用
		String res = proxyInstance.teach();
		System.out.println("res=" + res);
	}

}

追踪源码

​​​​​​​

15.5 几种常见的代理模式介绍------几种变体