java 集合小练习 超市库存管理系统

package Demo02;

public class chaoshi {
    int id;
    String name;
    double price;
}

package Demo02;
import java.util.ArrayList;
import java.util.Scanner;
public class test {
    public static void main(String[] args) {
        ArrayList<chaoshi> arr = new ArrayList<chaoshi>();  //导入超市类
        chaoshi arr1 = new chaoshi();    //创建一个新对象，对他的属性赋值
        arr1.id = 9001;
        arr1.name = "核桃饼";
        arr1.price = 120.0;
        arr.add(arr1);
        chaoshi arr2 = new chaoshi();
        arr2.id = 9002;
        arr2.name = "牡丹饼";
        arr2.price = 20.0;
        arr.add(arr2);    
        chaoshi arr3 = new chaoshi();
        arr3.id = 9002;
        arr3.name = "哈蜜瓜";
        arr3.price = 7.0;
        arr.add(arr3);    
        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
            switch(shouye()){
            case 1:
                a(arr);
                break;
            case 2:
                b(arr);
                break;
            case 3:
                c(arr);
                break;
            case 4 :
                d(arr);
                break;
            case 5:
                return;
            }
        }
        
    }
    public static int shouye(){
        System.out.println("=========欢迎oracle超市==========");
        System.out.println("1.货物清单");
        System.out.println("2.添加新货物");
        System.out.println("3.删除货物");
        System.out.println("4.修改货物");
        System.out.println("退出系统");
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入要操作的编号");
        int num = sc.nextInt();
        return num;
    }
    
    public static void  a(ArrayList<chaoshi> arr){
        System.out.println("=======商品库存清单==========");
        System.out.print("商品单号");
        System.out.print("商品名称");
        System.out.println("商品价格");
        for(int i = 0;i<arr.size();i++){
            System.out.println(arr.get(i).id+"	"+arr.get(i).name+"	"+arr.get(i).price);
        }
    }
    public static void b(ArrayList<chaoshi> arr){
        Scanner sc = new Scanner(System.in);
        System.out.println("请输入新水果的名称");
        String a = sc.next();
        System.out.println("请输入新水果的编号");
        int b = sc.nextInt();
        System.out.println("请输入新水果的单价");
        double c = sc.nextDouble();
        chaoshi arr4 = new chaoshi();
        arr4.name = a;
        arr4.id = b;
        arr4.price = c;
        arr.add(arr4);    
    }
    public static void  c(ArrayList<chaoshi> arr){
        System.out.println("请输入要删除的编号");
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        for(int i= 0;i<arr.size();i++){
            if(arr.get(i).id== a){
                arr.remove(i);
            }
        }
        System.out.println("删除完毕");
    }
    public static void d(ArrayList<chaoshi> arr){
        System.out.println("请输入要修改的水果编号");
        Scanner sc = new Scanner(System.in);
        int a = sc.nextInt();
        System.out.println("请输入要新的水果编号");
        int b = sc.nextInt();
        System.out.println("请输入要新的水果名称");
        String c = sc.next();
        System.out.println("请输入要新的水果单价");
        double d = sc.nextDouble();
        for(int i= 0;i<arr.size();i++){
            if(arr.get(i).id== a){
                arr.get(i).id = b;
                arr.get(i).name = c;
                arr.get(i).price = d;
                System.out.println("修改完毕");
            }    
        }
    }
}