java实现超市商品库存管理平台

public class FruitItem {
 int ID;  //商品的ID
 String name; //商品的名称
 double price; //商品的单价
}

public class market {
 public static void main(String[] args) {
  System.out.println("=========系统开始！=========");
 
  ArrayList<FruitItem> list = new ArrayList<>();
 
  //调用商品初始化方法,传递集合
  init(list);
  while (true) {
   //打印菜单
   mainMenu();
   //功能选择
   chooseFun(list);
  }
 }
 
 //商品初始化
 public static void init(ArrayList<FruitItem> list) {
  FruitItem item1 = new FruitItem();
  item1.ID = 001;
  item1.name = "柚子";
  item1.price = 5.0;
 
  FruitItem item2 = new FruitItem();
  item2.ID = 002;
  item2.name = "芒果";
  item2.price = 8.8;
 
  FruitItem item3 = new FruitItem();
  item3.ID = 003;
  item3.name = "橙子";
  item3.price = 6.6;
 
  list.add(item1);
  list.add(item2);
  list.add(item3);
 }
 
 //打印菜单
 public static void mainMenu() {
  System.out.println("========= 欢迎光临超市 ========");
  System.out.println("1:查询货物 2:添加货物 3:删除货物 4:修改货物 5:退出");
 }
 
 //功能选择
 public static void chooseFun(ArrayList<FruitItem> list) {
  Scanner sc = new Scanner(System.in);
  System.out.print("输入您选择的功能：");
  int choose = sc.nextInt();
 
  switch (choose) {
   case 1:// 库存查询
    showList(list);
    break;
   case 2:// 添加库存
    addList(list);
    break;
   case 3:// 删除商品
    delList(list);
    break;
   case 4:// 修改商品
    editList(list);
    break;
   case 5: // 退出系统
    System.out.println("退出系统");
    return;
   default:
    System.out.println("对不起，没有您输入的功能，请重新选择");
    break;
  }
 }
 
 //库存查询
 public static void showList(ArrayList<FruitItem> list) {
  System.out.println("=============商品库存清单=============");
  System.out.println("商品编号\t商品名称\t商品单价");
  for (int i = 0; i < list.size(); i++) {
   FruitItem item = list.get(i);
   System.out.println(item.ID +"\t\t"+item.name + "\t\t" + item.price);
  }
 }
 
 //添加库存
 public static void addList(ArrayList<FruitItem> list) {
  FruitItem item = new FruitItem();
  Scanner sc = new Scanner(System.in);
  System.out.print("请输入商品编号：");
  item.ID = sc.nextInt();
  System.out.print("请输入商品名称：");
  item.name = sc.next();
  System.out.print("请输入商品价格：");
  item.price = sc.nextDouble();
  list.add(item);
 }
 
 //删除商品
 public static void delList(ArrayList<FruitItem> list) {
  Scanner sc = new Scanner(System.in);
  System.out.print("请输入需要删除商品的编号");
  int num = sc.nextInt();
  for (int i = 0; i < list.size(); i++) {
   FruitItem item = list.get(i);
   if (item.ID == num) {
    list.remove(item);
    return;
   }
  }
  System.out.println("对不起，没有这个编号的商品。");
 }
 
 //修改商品
 public static void editList(ArrayList<FruitItem> list) {
  Scanner sc = new Scanner(System.in);
  System.out.print("请输入要修改商品的编号：");
  int num = sc.nextInt();
  for (int i = 0; i < list.size(); i++) {
   FruitItem item = list.get(i);
   if (item.ID == num) {
    System.out.print("请输入新的商品ID:");
    item.ID = sc.nextInt();
    System.out.print("请输入新的商品名称:");
    item.name = sc.next();
    System.out.print("请输入新的商品单价:");
    item.price = sc.nextDouble();
    System.out.println("商品信息更新完毕!");
    return;
   }
  }
  System.out.println("对不起，没有这个编号的商品。");
 }
}