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;

}

}

}

}

超市管理系统类

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;

}

}

}

}