前言

1.整体思路

2.Book包

2.1Book类

2.2BookList类

前言

该图书管理系统充分展示面向对象思想，是类与对象，封装，继承，多态，抽象类，接口等知识的融合体现。

若有不了解的内容，可以查看本博主的曾写的相关内容。

面向对象程序三大特性一：封装（超详细）_WHabcwu的博客-CSDN博客

面向对象程序三大特性一：多态（超详细）_WHabcwu的博客-CSDN博客

抽象类的顶级理解_WHabcwu的博客-CSDN博客

接口的顶级理解_WHabcwu的博客-CSDN博客

需求：登录的用户分为普通用户和管理员，实现界面目录的需求（均用姓名索引）。

普通用户登录后界面：

管理员用户登录后界面：

图书管理系统已有图书如下：

1.整体思路

面向对象思想解决问题主要分为这3步：

找出其中的所有的对象

实现所有的对象

完成对象之间的交互

在图书管理系统中我们可以想到这几个对象：书，用户（普通用户和管理员），存放书的书架。

操作太多这里推荐新建将所有的操作都单独封装成一个类。

分为三个包进行实现：

book包里面实现书类和书架类

operation包里实现我们的操作类

user包里实现普通用户类与管理员类

++其中所有的操作都实现名为IOperation的接口。便于统一管理（多态的体现）++

++普通用户和管理员都继承用户User这个父类。++

实现所有类如下：

2.Book包

2.1Book类

在这个类实现的是我们图书该有的属性，与相应的构造方法，以及为了方便我们打印而重写的toString方法

java 复制代码

package book;

public class Book {
    private String name;
    private String author;
    private int price;
    private String type;
    private boolean isBorrowed;

    public Book(String name, String author, int price, String type) {
        this.name = name;
        this.author = author;
        this.price = price;
        this.type = type;
    }

    public String getName() {
        return name;
    }

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

    public String getAuthor() {
        return author;
    }

    public void setAuthor(String author) {
        this.author = author;
    }

    public int getPrice() {
        return price;
    }

    public void setPrice(int price) {
        this.price = price;
    }

    public String getType() {
        return type;
    }

    public void setType(String type) {
        this.type = type;
    }

    public void setBorrowed(boolean borrowed) {
        isBorrowed = borrowed;
    }

    @Override
    public String toString() {
        return "{" +
                "name='" + name + '\'' +
                ", author='" + author + '\'' +
                ", price=" + price +
                ", type='" + type + '\'' +
                ", "+(isBorrowed==false?"未被借出":"已被借出")+
                '}';
    }
}

2.2BookList类

我们需要存放很多Book的数组，操作的数组，加入图书管理系统已有图书。

java 复制代码

public class BookList {
    private Book books[]=new Book[100];
    private  int useSize;

    public BookList() {
        this.books[0] = new Book("三国演义","罗贯中",10,"小说");
        this.books[1] = new Book("西游记","吴承恩",9,"小说");
        this.books[2] = new Book("红楼梦","曹雪芹",19,"小说");
        this.useSize = 3;
    }

    public int getUseSize() {
        return useSize;
    }

    public void setUseSize(int useSize) {
        this.useSize = useSize;
    }

    public Book getbook(int pose){
            return books[pose];

    }
    public void setbook(int pose,Book book){
       books[pose]=book;
    }

    public Book[] getBooks() {
        return books;
    }
}

3.user包

3.1User类

这里的User类是作为NormalUser类与AdminUser类的父类，是一个抽象类。

java 复制代码

package user;

import book.BookList;
import operation.IOperation;

public abstract class User {
    protected String name;
    IOperation iOperations[];
    public User(String name) {
        this.name = name;
    }
    public abstract int menu();
  public void doOperation(int choice, BookList bookList){
      iOperations[choice].work(bookList);
  }

}

3.2NormalUser类

java 复制代码

package user;

import operation.*;

import java.util.Scanner;

public class NormalUser extends User {
    public NormalUser(String name) {
        super(name);
        this.iOperations = new IOperation[]{new ExitOperation(), new FindOperation(),
                new BorrowOperation(), new ReturnOperation(),new ShowOperation()};
    }

    @Override
    public int menu() {

        System.out.println("**************************");
        System.out.println("1.查阅图书");
        System.out.println("2.借阅图书");
        System.out.println("3.归还图书");
        System.out.println("4.显示图书");
        System.out.println("0.退出系统");
        System.out.println("**************************");
        System.out.println("请输入你的操作");
        Scanner scanner = new Scanner(System.in);
        int choice = scanner.nextInt();
        return choice;
    }


}

3.3AdminUser类

java 复制代码

package user;

import operation.*;

import java.util.Scanner;

public class AdminUser extends User{
    public AdminUser(String name) {
        super(name);
        this.iOperations=new IOperation[]{new ExitOperation(),new FindOperation()
                ,new AddOperation(), new DelOperation(),new ShowOperation()};
    }
    public int menu(){
        System.out.println("**************************");
        System.out.println("1.查找图书");
        System.out.println("2.新增图书");
        System.out.println("3.删除图书");
        System.out.println("4.显示图书");
        System.out.println("0.退出系统");
        System.out.println("**************************");
        Scanner scanner =new Scanner(System.in);
        System.out.println("请输入你的操作");
        int choice=scanner.nextInt();
        return choice;
    }
}

4.operation

4.1IOPeration接口

会有一个work的抽象方法，参数类型为BookList的

java 复制代码

package operation;

import book.BookList;

public interface IOperation {
void work(BookList bookList);
}

4.2ExitOperation类

用于退出该系统

java 复制代码

package operation;

import book.BookList;

public class ExitOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        System.out.println("退出系统");
    }
}

4.3FindOperation类

用于查找图书

java 复制代码

package operation;
import book.Book;
import book.BookList;
import java.util.Scanner;

public class FindOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        int size=bookList.getUseSize();
        Scanner scanner = new Scanner(System.in);
        System.out.println("请输入你要查询的书名");
        String name=scanner.nextLine();
        for (int i = 0; i < size; i++) {
            Book book = bookList.getbook(i);
            if(book.getName().equals(name)){
                System.out.println("找到这本书，信息如下");
                System.out.println(book);
                return;
            }
        }
        System.out.println("查无此书");
    }
}

4.4ShowOperation类

用于展示所有图书

java 复制代码

package operation;

import book.Book;
import book.BookList;

public class ShowOperation implements IOperation {
    @Override
    public void work(BookList bookList) {
        int size=bookList.getUseSize();
        for (int i = 0; i < size; i++) {
            Book book = bookList.getbook(i);
            System.out.println(book);
        }
    }
}

4.5AddOperation类

用于添加图书

java 复制代码

package operation;
import book.Book;
import book.BookList;
import java.util.Scanner;
public class AddOperation implements IOperation {
    @Override
    public void work(BookList bookList) {
        int size=bookList.getUseSize();
        if(size==bookList.getBooks().length){
            System.out.println("书架已满，无法添加图书");
            return;
        }
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入添加书的书名");
        String name=scanner.nextLine();
        System.out.println("请输入添加书的作者");
        String author=scanner.nextLine();
        System.out.println("请输入添加书的类型");
        String type=scanner.nextLine();
        System.out.println("请输入添加书的价格");
        int price=scanner.nextInt();
        Book book = new Book(name, author, price, type);
        for (int i = 0; i < size; i++) {
            if(bookList.getbook(i).getName().equals(name)){
                System.out.println("该书已有，不再存入");
                return;
            }
        }
        bookList.setbook(size,book);
        bookList.setUseSize(size+1);
    }

}

4.6DelOperation类

用于删除图书

java 复制代码

package operation;

import book.BookList;
import java.util.Scanner;

public class DelOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入要删除书的书名");
        String name=scanner.nextLine();
        int size = bookList.getUseSize();
        int i=0;
        for (i = 0; i < size; i++) {
            if(bookList.getbook(i).getName().equals(name)){
                break;
            }
        }
        if(i==size){
            System.out.println("你要删除的书不存在");
            return;
        }
        int j=0;
        for ( j = i; j <size-1; j++) {
            bookList.setbook(j,bookList.getbook(j+1));
        }
        bookList.setbook(j,null);
        bookList.setUseSize(size-1);
        System.out.println("删除成功");
    }
}

4.7BorrowOperation类

java 复制代码

package operation;

import book.BookList;

import java.util.Scanner;

public class BorrowOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入要借阅书的书名");
        int size=bookList.getUseSize();
        String name=scanner.nextLine();
        for (int i = 0; i < size; i++) {
            if(bookList.getbook(i).getName().equals(name)){
               bookList.getbook(i).setBorrowed(true);
                System.out.println("成功借出");
                return;
            }
        }
        System.out.println("你要借的书不存在");
    }
}

4.8ReturnOperation类

java 复制代码

package operation;

import book.BookList;

import java.util.Scanner;

public class ReturnOperation implements IOperation{
    @Override
    public void work(BookList bookList) {
        Scanner scanner=new Scanner(System.in);
        System.out.println("请输入要还的书的书名");
        int size=bookList.getUseSize();
        String name=scanner.nextLine();
        for (int i = 0; i < size; i++) {
            if(bookList.getbook(i).getName().equals(name)){
                bookList.getbook(i).setBorrowed(false);
                System.out.println("成功归还");
                return;
            }
        }
        System.out.println("你要还的书不存在");
    }
}

5.Text类

java 复制代码

import java.util.Scanner;

import book.BookList;
import user.AdminUser;
import user.NormalUser;
import user.User;

public class Text {
public static User login(){
    Scanner scanner=new Scanner(System.in);
    System.out.println("请输入你的姓名");
    String name=scanner.nextLine();
    System.out.println("请输入你的身份:> 1.管理员  2.普通用户");
    int choice=scanner.nextInt();
    if(choice==1){
        return new AdminUser(name);
    }else {
        return new NormalUser(name);
    }

}

    public static void main(String[] args) {
        BookList bookList = new BookList();
        User user=login();
        int choice=-1;
       do{
            choice=user.menu();
            user.doOperation(choice,bookList);
        }while (choice!=0);
    }
}

以上为我个人的小分享，如有问题，欢迎讨论！！！

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简易图书管理系统（面向对象思想）

前言

1.整体思路

2.Book包

2.1Book类

2.2BookList类

3.user包

3.1User类

3.2NormalUser类

3.3AdminUser类

4.operation

4.1IOPeration接口

4.2ExitOperation类

4.3FindOperation类

4.4ShowOperation类

4.5AddOperation类

4.6DelOperation类

4.7BorrowOperation类

4.8ReturnOperation类

5.Text类