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：
1 package Text; 2 3 public interface BookManager { 4 boolean addBooks(); 5 int search(int num); 6 boolean instor(int num,int innum); 7 boolean outstor(int num,int outnum); 8 }
实现类：
1 package Text; 2 3 import java.util.*; 4 5 public class BookManagerlmpl implements BookManager { 6 List<Map> books=new ArrayList<>(); 7 Scanner scanner = new Scanner(System.in); 8 @Override 9 public boolean addBooks() { 10 System.out.println("请输入添加的书本编号"); 11 int booknum = scanner.nextInt(); 12 int search = search(booknum); 13 if(search==-1){ 14 System.out.println("请输入添加的书本名称"); 15 String bookname = scanner.next(); 16 System.out.println("请输入添加的书本价格"); 17 double bookprice = scanner.nextInt(); 18 System.out.println("请输入书本库存"); 19 int count = scanner.nextInt(); 20 Map<String,Object> map = new HashMap<>(); 21 map.put("bookname",bookname); 22 map.put("bookprice",bookprice); 23 map.put("booknum",booknum); 24 map.put("bookcount",count); 25 books.add(map); 26 }else{ 27 System.out.println("该编号已存在"); 28 } 29 return true; 30 } 31 32 @Override 33 public int search(int num) { 34 int index = -1; 35 for (int i = 0; i <books.size() ; i++) { 36 if(books.get(i).get("booknum").equals(num)){ 37 index = i; 38 break; 39 } 40 } 41 return index; 42 } 43 44 @Override 45 public boolean instor(int num, int innum) { 46 int index= search(num); 47 if(index!=-1){ 48 int count=(int)books.get(index).get("bookcount")+innum; 49 books.get(index).put("bookcount",count); 50 return true; 51 }else{ 52 return false; 53 } 54 55 } 56 57 @Override 58 public boolean outstor(int num, int outnum) { 59 int index= search(num); 60 if(index!=-1){ 61 int count=(Integer) books.get(index).get("bookcount")-outnum; 62 books.get(index).put("bookcount",count); 63 return true; 64 }else{ 65 return false; 66 } 67 } 68 69 public static void main(String[] args) { 70 BookManagerlmpl managerlmpl = new BookManagerlmpl(); 71 Scanner scanner = new Scanner(System.in); 72 while(true) { 73 System.out.println("请选择操作 1.添加 2.查询 3.入库 4.出库 5.退出"); 74 int choose = scanner.nextInt(); 75 if(choose==1){ 76 managerlmpl.addBooks(); 77 System.out.println(managerlmpl.books); 78 }else if( choose==2){ 79 System.out.println("请输入要查询的书本编号"); 80 int booknum = scanner.nextInt(); 81 int search = managerlmpl.search(booknum); 82 if(search!=-1){ 83 System.out.println("查询成功"); 84 System.out.println(managerlmpl.books.get(search)); 85 }else{ 86 System.out.println("查询失败"); 87 } 88 }else if(choose==3){ 89 System.out.println("请输入入库的书本编号"); 90 int booknum = scanner.nextInt(); 91 System.out.println("请输入要入库的书本数量"); 92 int innum = scanner.nextInt(); 93 boolean instor = managerlmpl.instor(booknum, innum); 94 if(instor){ 95 System.out.println("入库成功"); 96 int search = managerlmpl.search(booknum); 97 System.out.println(managerlmpl.books.get(search)); 98 }else{ 99 System.out.println("入库失败"); 100 } 101 102 }else if(choose==4){ 103 System.out.println("请输入出库的书本编号"); 104 int booknum = scanner.nextInt(); 105 System.out.println("请输入要出库的书本数量"); 106 int outnum = scanner.nextInt(); 107 boolean outstor = managerlmpl.outstor(booknum, outnum); 108 if(outstor){ 109 System.out.println("出库成功"); 110 int search = managerlmpl.search(booknum); 111 System.out.println(managerlmpl.books.get(search)); 112 }else{ 113 System.out.println("出库失败"); 114 } 115 }else if(choose==5){ 116 System.out.println("已退出"); 117 break; 118 } 119 } 120 } 121 }