Java案例：使用集合（ArrayList）做超市管理系统

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Java案例：使用集合（ArrayList）做超市管理系统

一、运行效果如下

1. 商品清单

2. 添加商品

3. 删除商品

4. 修改商品信息

二、Java代码

1. 商品类

import java.util.ArrayList;
/*
* 商品类
* */
public class Goods {//商品编号private int id;//单价private double price;//商品名称private String name;public Goods(int id, double price, String name) {this.id = id;this.price = price;this.name = name;}public Goods() {}public int getId() {return id;}public void setId(int id) {this.id = id;}public double getPrice() {return price;}public void setPrice(double price) {this.price = price;}public String getName() {return name;}public void setName(String name) {this.name = name;}@Overridepublic String toString() {return "Goods{" +"id=" + id +", price=" + price +", name='" + name + '\'' +'}';}}

2. 主菜单

import java.util.ArrayList;
import java.util.Scanner;
/*
* 主菜单
* */
public class MainMenu {public void menu(ArrayList<Goods> goods,ProductList productList,AddGoods addGoods,DeleteGoods deleteGoods,UpdataGoods updataGoods) {Scanner sc = new Scanner(System.in);System.out.println("======超市管理系统=====");System.out.println("1：商品清单 \n2：添加商品 \n3：删除商品  \n4：修改商品信息  \n5：退出");System.out.print("请输入你的选择：");switch (sc.nextInt()){case 1:productList.goodsList(goods);break;case 2:goods = addGoods.addGoods(goods);break;case 3:goods = deleteGoods.deleteGoods(goods);break;case 4:goods = updataGoods.updata(goods);break;case 5:System.out.println("谢谢使用，欢迎下次光临！");System.exit(1);break;default:break;}System.out.print("输入1返回主菜单：");if (sc.nextInt()==1){menu(goods,productList,addGoods,deleteGoods,updataGoods);}else {System.out.println("你输入有误！已退出！");}}
}

3. 商品清单

import java.util.ArrayList;/*
* 商品清单
* */
public class ProductList {public void goodsList(ArrayList<Goods> goods){System.out.println("=========商品清单=========");System.out.println("商品编号\t\t商品单价\t\t商品名称");for (Goods g:goods) {System.out.println(g.getId()+"\t\t"+g.getPrice()+"\t"+g.getName());}}
}

4. 添加商品

import java.util.ArrayList;
import java.util.Scanner;/*
* 增加货物
* */
public class AddGoods {public ArrayList<Goods> addGoods(ArrayList<Goods> goods){Goods g = new Goods();Scanner sc = new Scanner(System.in);System.out.println("您现在使用的是添加商品功能");System.out.print("请输入商品编号：");int id = sc.nextInt();for (int i = 0; i < goods.size() ; i++) {//判断编号是否已存在if (goods.get(i).getId()==id){System.out.println("这个商品编号已存在，添加失败！");break;}else if ((i==(goods.size()-1))&&(goods.get(i).getId()!=id)){g.setId(id);System.out.print("请输入商品单价：");g.setPrice(sc.nextDouble());System.out.print("请输入商品名称：");g.setName(sc.next());goods.add(g);if (goods.contains(g)){System.out.println("添加成功！");}else {System.out.println("没有添加成功！");}break;}}return goods;}
}

5. 删除商品

import java.util.ArrayList;
import java.util.Scanner;/*
* 删除货物
* */
public class DeleteGoods {public ArrayList<Goods> deleteGoods(ArrayList<Goods> goods){Scanner sc = new Scanner(System.in);System.out.println("您现在使用的是删除功能");System.out.print("输入要删除的商品编号：");int id = sc.nextInt();for (int i = 0; i < goods.size() ; i++) {if (goods.get(i).getId()==id){goods.remove(i);System.out.println("删除成功！");break;}else if (i==goods.size()-1&&goods.get(i).getId()!=id){System.out.println("该商品编号不存在!");}}return goods;}
}

6. 修改商品信息

import java.util.ArrayList;
import java.util.Scanner;
/*
* 修改功能
* */
public class UpdataGoods {public ArrayList<Goods> updata(ArrayList<Goods> goods){Scanner sc = new Scanner(System.in);System.out.println("您现在使用的是商品信息修改功能");System.out.print("请输入你要修改的商品编号：");int id = sc.nextInt();for (int i = 0; i < goods.size() ; i++) {if (goods.get(i).getId()==id){System.out.print("请输入新的的商品编号：");goods.get(i).setId(sc.nextInt());System.out.print("请输入新的的商品单价：");goods.get(i).setPrice(sc.nextDouble());System.out.print("请输入新的的商品名称：");goods.get(i).setName(sc.next());System.out.println("修改成功！");break;}else if (i==goods.size()-1&&goods.get(i).getId()!=id){System.out.println("你输入的商品编号不存在！");}}return goods;}
}

7. 测试类

import java.util.ArrayList;import static java.awt.SystemColor.menu;public class Test {public static void main(String[] args) {//储存货物信息ArrayList<Goods> goods = new ArrayList();goods.add(new Goods(1001,2.5,"土豆"));goods.add(new Goods(1002,20,"鱼"));goods.add(new Goods(1003,5,"记事本"));goods.add(new Goods(1004,5,"水杯"));goods.add(new Goods(1005,30,"洗衣液"));MainMenu mainMenu = new MainMenu();ProductList productList = new ProductList();AddGoods addGoods = new AddGoods();DeleteGoods deleteGoods = new DeleteGoods();UpdataGoods updataGoods = new UpdataGoods();mainMenu.menu(goods,productList,addGoods,deleteGoods,updataGoods);}
}

注意：给ArrayList添加、删除和修改数据时使用迭代器会报错！