java实现超市管理系统

 import java.util.Arrays; public class Goods { private int id; private double price; private String name; public Goods(int id, double price, String name) { this.id = id; this.price = price; this.name = name; } 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; } public Goods() { } //增加商品 public Goods[] add(Goods[]goods,Goods newGood){ goods= Arrays.copyOf(goods,goods.length+1); goods[goods.length-1]=newGood; return goods; } //删除商品 public static Goods[] del(Goods[]goods,int id){ int i=0; while(true){ if(goods[i].getId()==id){ goods[i]=null; return goods; } i++; if(i>=goods.length){ return goods; } } } //添加商品 public static Goods[] change(Goods[]goods,int id,int newId,double newPrice,String newName){ int i=0; while (true){ if(goods[i].getId()==id){ goods[i].setId(newId); goods[i].setPrice(newPrice); goods[i].setName(newName); return goods; } i++; if(i>=goods.length){ return goods; } } } }

 import java.util.Scanner; public class marketManager { public static void main(String[] args) { Scanner sc = new Scanner(System.in); Goods g1=new Goods(1000,10,"笔记本"); Goods g2=new Goods(1001,2,"西红柿"); Goods g3=new Goods(1002,5,"辣条"); Goods []goods={g1,g2,g3}; while (true) { System.out.println("========超市管理系统======="); System.out.println("1.货物清单 2.增加商品 3.删除商品 4.修改商品 5.退出"); System.out.println("请输入你要操作的编号："); int i = sc.nextInt(); switch (i){ case 1: 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 a:goods) { if(a==null){ continue; } System.out.println(a.getId()+"\t\t"+a.getPrice()+"\t\t"+a.getName()); } continue; case 2: System.out.println("你选择的是增加商品的功能"); System.out.println("请输入你要添加的编号："); int Id = sc.nextInt(); System.out.println("请输入你要添加的商品价格："); double price = sc.nextDouble(); System.out.println("请输入你要添加的商品名称"); String name = sc.next(); Goods good=new Goods(Id,price,name); goods = good.add(goods, good); System.out.println("添加成功！"); continue; case 3: System.err.println("你选择的是删除商品功能"); System.out.println("请输入你要操作的编号："); Id = sc.nextInt(); goods=Goods.del(goods,Id); System.out.println("删除成功！"); continue; case 4: System.out.println("你选择的是修改商品功能"); System.out.println("请输入你要操作的编号："); Id=sc.nextInt(); System.out.println("请输入修改后的编号："); int newId = sc.nextInt(); System.out.println("请输入修改后的价格："); double newPrice = sc.nextDouble(); System.out.println("请输入修改后的商品名称："); String newName=sc.next(); goods=Goods.change(goods,Id,newId,newPrice,newName); continue; case 5: return; } } } }