java 集合小练习 超市库存管理系统

Posted 2020-11-05 呐呐呐那

 

1 package Demo02;
2 
3 public class chaoshi {
4     int id;
5     String name;
6     double price;
7 }

  1 package Demo02;
  2 import java.util.ArrayList;
  3 import java.util.Scanner;
  4 public class test {
  5     public static void main(String[] args) {
  6         ArrayList<chaoshi> arr = new ArrayList<chaoshi>();  //导入超市类
  7         chaoshi arr1 = new chaoshi();    //创建一个新对象，对他的属性赋值
  8         arr1.id = 9001;
  9         arr1.name = "核桃饼";
 10         arr1.price = 120.0;
 11         arr.add(arr1);
 12         chaoshi arr2 = new chaoshi();
 13         arr2.id = 9002;
 14         arr2.name = "牡丹饼";
 15         arr2.price = 20.0;
 16         arr.add(arr2);    
 17         chaoshi arr3 = new chaoshi();
 18         arr3.id = 9002;
 19         arr3.name = "哈蜜瓜";
 20         arr3.price = 7.0;
 21         arr.add(arr3);    
 22         while(true){     //while来个死循环，然后流程语句switch每次执行都走一遍第一个方法
 23             switch(shouye()){
 24             case 1:
 25                 a(arr);
 26                 break;
 27             case 2:
 28                 b(arr);
 29                 break;
 30             case 3:
 31                 c(arr);
 32                 break;
 33             case 4 :
 34                 d(arr);
 35                 break;
 36             case 5:
 37                 return;
 38             }
 39         }
 40         
 41     }
 42     public static int shouye(){
 43         System.out.println("=========欢迎oracle超市==========");
 44         System.out.println("1.货物清单");
 45         System.out.println("2.添加新货物");
 46         System.out.println("3.删除货物");
 47         System.out.println("4.修改货物");
 48         System.out.println("退出系统");
 49         Scanner sc = new Scanner(System.in);
 50         System.out.println("请输入要操作的编号");
 51         int num = sc.nextInt();
 52         return num;
 53     }
 54     
 55     public static void  a(ArrayList<chaoshi> arr){
 56         System.out.println("=======商品库存清单==========");
 57         System.out.print("商品单号");
 58         System.out.print("商品名称");
 59         System.out.println("商品价格");
 60         for(int i = 0;i<arr.size();i++){
 61             System.out.println(arr.get(i).id+"\\t"+arr.get(i).name+"\\t"+arr.get(i).price);
 62         }
 63     }
 64     public static void b(ArrayList<chaoshi> arr){
 65         Scanner sc = new Scanner(System.in);
 66         System.out.println("请输入新水果的名称");
 67         String a = sc.next();
 68         System.out.println("请输入新水果的编号");
 69         int b = sc.nextInt();
 70         System.out.println("请输入新水果的单价");
 71         double c = sc.nextDouble();
 72         chaoshi arr4 = new chaoshi();
 73         arr4.name = a;
 74         arr4.id = b;
 75         arr4.price = c;
 76         arr.add(arr4);    
 77     }
 78     public static void  c(ArrayList<chaoshi> arr){
 79         System.out.println("请输入要删除的编号");
 80         Scanner sc = new Scanner(System.in);
 81         int a = sc.nextInt();
 82         for(int i= 0;i<arr.size();i++){
 83             if(arr.get(i).id== a){
 84                 arr.remove(i);
 85             }
 86         }
 87         System.out.println("删除完毕");
 88     }
 89     public static void d(ArrayList<chaoshi> arr){
 90         System.out.println("请输入要修改的水果编号");
 91         Scanner sc = new Scanner(System.in);
 92         int a = sc.nextInt();
 93         System.out.println("请输入要新的水果编号");
 94         int b = sc.nextInt();
 95         System.out.println("请输入要新的水果名称");
 96         String c = sc.next();
 97         System.out.println("请输入要新的水果单价");
 98         double d = sc.nextDouble();
 99         for(int i= 0;i<arr.size();i++){
100             if(arr.get(i).id== a){
101                 arr.get(i).id = b;
102                 arr.get(i).name = c;
103                 arr.get(i).price = d;
104                 System.out.println("修改完毕");
105             }    
106         }
107     }
108 }