Java用listmap简单实现图书管理系统

要求使用List存储Book信息完成如下功能
图书管理系统
1、进书
2、借书
3、还书
4、统计书籍总金额
5、删除
 

import java.util.*;

public class Books {
    //定义书籍

    List list = new ArrayList();
    Scanner jp = new Scanner(System.in);

    //进书初始化;
    public void jinshu() {
        list.add(new Book("三国演义", 299.0, 30));
        list.add(new Book("红楼梦", 199.0, 20));
        list.add(new Book("水浒传", 99.0, 10));

    }

    public void jieshu() {
        System.out.println("选择要借的书");
        String name = jp.next();
        boolean flag = false;
        for (int i = 0; i < list.size(); i++) {
            Book book1 = list.get(i);

            for (Book book : list) {
                if (name.equals(book1.getName())) {
                    System.out.println("要借的数量");
                    int s1 = jp.nextInt();
                    //将原来的数量取出来减去要借的数量，再重新赋值
                    book.setNum(book.getNum() - s1);
                    flag = true;
                    break;
                }
            }
        }
        if (flag == false) {
            System.out.println("书籍名称不存在");
        }
    }

    public void chaxun() {
        for (Book book : list) {
            System.out.println(book.getName() + " " + book.getPrice() + "元" + " " + book.getNum()+"本");
        }
    }

    public void huanshu() {
        System.out.println("选择要还的书");
        String name2 = jp.next();
        boolean flag = false;
        for (int i = 0; i < list.size(); i++) {
            Book book1 = list.get(i);

            for (Book book : list) {
                if (name2.equals(book1.getName())) {
                    System.out.println("要还的数量");
                    int s2 = jp.nextInt();
                    book.setNum(book.getNum() + s2);
                    flag = true;
                    break;
                }
            }
            }
        if (flag == false) {
            System.out.println("你是还的哪里的书?????");
        }
        chaxun();
    }
    public void shuprice(){
        System.out.println("统计所有书的总金额");
       //当集合的泛型是实体类时，只计算类中某一属性的值相加之和
        Double sum = list.stream().mapToDouble(Book::getPrice).sum();
        System.out.println(sum);
    }
    public void delete() {
        System.out.println("请输入要删除的书籍");
        //输入要删除的书籍
        String book = jp.next();
        for (int i = 0; i < list.size(); i++) {
            Book book2 = list.get(i);
            if ((book2.getName().equals(book))) {
                list.remove(i);
            }
        }
        chaxun();
    }
    public static void main(String[] args) {
        Books shu = new Books();
        shu.jinshu();
        shu.jieshu();
        shu.chaxun();
        shu.huanshu();
        shu.shuprice();
        shu.delete();

    }
}


//学生类
public class Book {
    private String name ;
    private double price ;
    private int num ;

    public Book() {
    }

    public Book(String name, double price, int num) {
        this.name = name;
        this.price = price;
        this.num = num;
    }

    public String getName() {
        return name;
    }

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

    public double getPrice() {
        return price;
    }

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

    public int getNum() {
        return num;
    }

    public void setNum(int num) {
        this.num = num;
    }

}



//Map
import java.util.*;

public class Books {

		//定义保存书籍的map
		 Map map = new HashMap();
		 Scanner jp = new Scanner(System.in); 
		 //进书、（初始化）
		 public void jinshu() {
			 Book s1 = new Book("西游记", 36.0, 10);
			 Book s2 = new Book("红楼梦", 49.0, 20);
			 Book s3 = new Book("三国演义",89.0, 30); 
			 
			//放入集合
			  map.put("b1",s1);
			  map.put("b2", s2);
			  map.put("b3", s3);
		 }
		 public void jieshu() {
			 System.out.println("输入要借的书");
			 //输入要借的书名
			 String name = jp.next();
			 //查看map中的value是否有书名
			 Set keys = map.keySet();
			 boolean jg = false ;
			for (String key : keys) {
				//根据key获取value
				Book book  = map.get(key);
				if (name.equals(book.getName())) {
					System.out.println("要借的数量");
					int s1 = jp.nextInt();
					//将原来的数量取出来减去要借的数量，再重新赋值
					book.setNum(book.getNum()-s1);
					jg = true;
					break;
				}
			}
			 if (jg==false) {
				System.out.println("书籍名称不存在");
			}
		 }
         public void chaxun() {
        	 Set keys = map.keySet();
        	 for (String key : keys) {
        		 Book book  = map.get(key);
				System.out.println(key +" "+book.getName()+" "+book.getNum());
			}
		 } 
         public void update () {
			System.out.println("输入书籍条形码");
			//输入要借的书籍
			String no = jp.next();
			if (map.containsKey(no)) {
				//根据key获取书籍
				Book bo = map.get(no);
				System.out.println("请输入要修改的书籍名称");
				String name = jp.next();
				bo.setName(name);
			}else {
				System.out.println("输入的条形码不存在");
			}
			chaxun();
		}
         public void delete() {
			System.out.println("请输入要删除的条形码");
			//输入要删除的书籍
			String book = jp.next();
			if(map.containsKey(book)) {
				map.remove(book);
			}
			chaxun();
		}
           public void returnshu() {
			 
		 } 
           public static void main(String[] args) {
			Books b1 = new Books();
			b1.jinshu();
			b1.jieshu();
		    b1.chaxun();
			b1.update();
		    b1.delete();
			
		}