【Java List与对象】List＜T＞对象和对象List＜T＞的区别（125）

List＜T＞对象 ：对象里面的元素属性包含List＜T＞(只有一个对象)；
对象List＜T＞：List＜T＞里面的数据是对象类型(可以有多组对象，但必须是同一个类型)；

测试案例：

Book类：

java 复制代码

import java.util.List;

public class Book {
	
	private List<String> name;
	private List<Integer> price;
	
	public List<String> getName() {
		return name;
	}
	public void setName(List<String> name) {
		this.name = name;
	}
	public List<Integer> getPrice() {
		return price;
	}
	public void setPrice(List<Integer> price) {
		this.price = price;
	}
	public Book(List<String> name, List<Integer> price) {
		super();
		this.name = name;
		this.price = price;
	}
	public Book() {
		super();
	}
	
}

Student类：

java 复制代码

public class Student {
	
	private String name;
	private int age;
	private String address;
	
	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 getAddress() {
		return address;
	}
	public void setAddress(String address) {
		this.address = address;
	}
	public Student(String name, int age, String address) {
		super();
		this.name = name;
		this.age = age;
		this.address = address;
	}
	public Student() {
		super();
	}	
	
}

测试Demo : (重点)

java 复制代码

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

public class day19 {
	public static void main(String[] args) {
		
		// List＜T＞对象：对象里面的元素属性包含List＜T＞(只有一个对象)；
		List<String> list = new ArrayList<>();
		Book b = new Book();
		List<String> nameList = Arrays.asList("语文","数学","英语");
		List<Integer> priceList = Arrays.asList(29,39,49);
		b.setName(nameList);
		b.setPrice(priceList);
	
		List<String> nameList2 = b.getName();
		for(String s:nameList2) {
			System.out.println("List＜T＞对象name:"+s);
		}
		List<Integer> priceList2 = b.getPrice();
		for(Integer s:priceList2) {
			System.out.println("List＜T＞对象price:"+s);
		}
		System.out.println("-------------------");
		
		// 对象List＜T＞：List＜T＞里面的数据是对象类型(可以有多组对象，但必须是同一个类型)；
		List<Student> list2 = new ArrayList<>();
		list2.add(new Student("小婷",22,"宝鸡"));
		list2.add(new Student("小霞",24,"西安"));
		list2.add(new Student("小桐",26,"汉中"));
		System.out.println("对象List＜T＞");
		for(Student s : list2) {
			Student st = s;
			System.out.println("name:"+st.getName()+"--"+"age:"+st.getAge()+"--"+"address:"+st.getAddress());
		}
		
	}
}

测试输出：

java 复制代码

List＜T＞对象name:语文
List＜T＞对象name:数学
List＜T＞对象name:英语
List＜T＞对象price:29
List＜T＞对象price:39
List＜T＞对象price:49
-------------------
对象List＜T＞
name:小婷--age:22--address:宝鸡
name:小霞--age:24--address:西安
name:小桐--age:26--address:汉中