集合

A: 创建一个接口BookManager

B：创建一个实现类：BookManagerImpl{

         成员变量：List<Map> books;

         public boolean addBooks(){

                   创建一个Map ；scanner录入：书本名称  书本编号   书本单价 库存

                   遍历books判断这个书本编号是否已经添加过，如果已经添加过返回false

                   否则：封装Map放入books列表中

}

Public int search(String 书本编号){

         根据编号查找书本信息

}

Public Boolean  instor(编号，入库数量){

         //入库

         查找进行入库，如果没有这个商品返回false

         否则在原有数量上+新的数量

}

Public Boolean outstore(编号，出库数量){

         //出库

}

}

C：书写一个main方法进行测试

接口：

package Text;

public interface BookManager {
    boolean addBooks();
    int search(int num);
    boolean instor(int num,int innum);
    boolean outstor(int num,int outnum);
}

实现类：

package Text;

import java.util.*;

public class BookManagerlmpl implements BookManager {
    List<Map> books=new ArrayList<>();
    Scanner scanner = new Scanner(System.in);
    @Override
    public boolean addBooks() {
         System.out.println("请输入添加的书本编号");
         int booknum = scanner.nextInt();
         int search = search(booknum);
         if(search==-1){
            System.out.println("请输入添加的书本名称");
            String bookname = scanner.next();
            System.out.println("请输入添加的书本价格");
            double bookprice = scanner.nextInt();
            System.out.println("请输入书本库存");
            int count = scanner.nextInt();
            Map<String,Object> map = new HashMap<>();
            map.put("bookname",bookname);
            map.put("bookprice",bookprice);
            map.put("booknum",booknum);
            map.put("bookcount",count);
            books.add(map);
        }else{
             System.out.println("该编号已存在");
        }
        return true;
    }

    @Override
    public int search(int num) {
        int index = -1;
        for (int i = 0; i <books.size() ; i++) {
            if(books.get(i).get("booknum").equals(num)){
                index = i;
                break;
            }
        }
        return index;
    }

    @Override
    public boolean instor(int num, int innum) {
        int index= search(num);
        if(index!=-1){
            int count=(int)books.get(index).get("bookcount")+innum;
            books.get(index).put("bookcount",count);
            return true;
        }else{
            return false;
        }

    }

    @Override
    public boolean outstor(int num, int outnum) {
        int index= search(num);
        if(index!=-1){
            int count=(Integer) books.get(index).get("bookcount")-outnum;
            books.get(index).put("bookcount",count);
            return true;
        }else{
            return false;
        }
    }

    public static void main(String[] args) {
        BookManagerlmpl managerlmpl = new BookManagerlmpl();
        Scanner scanner = new Scanner(System.in);
        while(true) {
            System.out.println("请选择操作  1.添加  2.查询  3.入库  4.出库  5.退出");
            int choose = scanner.nextInt();
            if(choose==1){
                managerlmpl.addBooks();
                System.out.println(managerlmpl.books);
            }else if( choose==2){
                System.out.println("请输入要查询的书本编号");
                int booknum = scanner.nextInt();
                int search = managerlmpl.search(booknum);
                if(search!=-1){
                    System.out.println("查询成功");
                    System.out.println(managerlmpl.books.get(search));
                }else{
                    System.out.println("查询失败");
                }
            }else if(choose==3){
                System.out.println("请输入入库的书本编号");
                int booknum = scanner.nextInt();
                System.out.println("请输入要入库的书本数量");
                int innum = scanner.nextInt();
                boolean instor = managerlmpl.instor(booknum, innum);
                if(instor){
                    System.out.println("入库成功");
                    int search = managerlmpl.search(booknum);
                    System.out.println(managerlmpl.books.get(search));
                }else{
                    System.out.println("入库失败");
                }

            }else if(choose==4){
                System.out.println("请输入出库的书本编号");
                int booknum = scanner.nextInt();
                System.out.println("请输入要出库的书本数量");
                int outnum = scanner.nextInt();
                boolean outstor = managerlmpl.outstor(booknum, outnum);
                if(outstor){
                    System.out.println("出库成功");
                    int search = managerlmpl.search(booknum);
                    System.out.println(managerlmpl.books.get(search));
                }else{
                    System.out.println("出库失败");
                }
            }else if(choose==5){
                System.out.println("已退出");
                break;
            }
        }
    }
}