java 商品 系统 代码

里面分为两个类，一个是Goods;类，用来实例化对象的；shopmanagement是存放主方法的类。Goods;类包括成员变量 （名称，价格，数量，编号，类型，供应商），每个成员变量都是private类型，都有相对应的get和set方法（好像用不到我就不写了）；我加了个prt（也就是print）的方法，当主方法调用查询功能的时候可以使用实例化对象的prt方法输出商品信息。

shopmanagement类的主方法包括两个循环，一个循环用来录入商品信息，另一个循环来查询商品信息，总报错无法运行，大神帮我看看怎么处理，是在解决不掉

package shopmanagement;
import java.util.Scanner;
class Goods {
private String name;
private int price;
private int sum;
private int code;
private String type;
private String supplier;
Goods(String name, int price, int sum, int code, String type, String supplier) {
this.name = name;
this.price = price;
this.sum = sum;
this.code = code;
this.type = type;
this.supplier = supplier;
}

public void prt() {
System.out.print("商品名称：" + this.name + "\t");
System.out.print("价格" + this.name + "\t");
System.out.print("库存：" + this.name + "\t");
System.out.print("编号：" + this.name + "\t");
System.out.print("类型：" + this.name + "\t");
System.out.print("供应商：" + this.name + "\t");
}

}

public class shopManagement {

public static void main(String[] args) {

System.out.println("********************商品管理系统********************");
System.out.println("********是否执行录入功能？Y执行，N切换到查询功能；********");

Scanner sc = new Scanner(System.in);


String function = sc.nextLine();
int i = 0;
Goods[] goods = null;
for (;;) {

if (function.equals("N")) {
System.out.println("切换到查询功能");
break;
}

System.out.println("商品名称（enter键结束）：");
String name = sc.nextLine();

System.out.println("价格（enter键结束）：");
int price = sc.nextInt();

System.out.println("存量（enter键结束）：");
int sum = sc.nextInt();

System.out.println("编号（enter键结束）：");
int code = sc.nextInt();

System.out.println("类型（enter键结束）：");
String type = sc.nextLine();

System.out.println("供应商（enter键结束）：");
String supplier = sc.nextLine();

goods[i] = new Goods(name, price, sum, code, type, supplier);
i++;

sc.close();
}


int j = 0;
System.out.println("是否继续操作？Y继续或N退出");
String function2 = new Scanner(System.in).nextLine();
for (;;) {
if (function2.equals("N")) {
System.out.println("正在退出");
System.exit(0);
System.out.println("输入品名");
String find = new Scanner(System.in).nextLine();

for (int k = 0; k < goods.length; k++) {
if (find.equals(goods[k].getName())) {
goods[k].prt();
}

}

}
}

}

}

package entity;

public class Market {

private int id;//id

private int num;//数量

private String goods;//商品

private double price;//价格

public Market(int id, int num, String goods, double price) {
super();
this.id = id;
this.num = num;
this.goods = goods;
this.price = price;
}

public int getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public int getNum() {
return num;
}

public void setNum(int num) {
this.num = num;
}

public String getGoods() {
return goods;
}

public void setGoods(String goods) {
this.goods = goods;
}

public double getPrice() {
return price;
}

public void setPrice(double price) {
this.price = price;
}

public double calc( ){

double sum=price*num;

System.out.println("您消费共计："+sum+"￥");

return sum;

}

}
package test;

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

import entity.Market;

public class Test {

private static Map<Integer,Market> goods=new HashMap<Integer, Market>();

public static void main(String[] args) {

System.out.println("-------超市计价系统-------");

String goods1="可口可乐";
String goods2="爆米花";
String goods3="益达";

printTable("编号","商品","价格");
printTable("1",goods1,"3.0￥");
printTable("2",goods2,"5.0￥");
printTable("3",goods3,"10.0￥");

goods.put(1, new Market(1, 1, goods1, 3.0));

goods.put(2, new Market(2, 1, goods2, 5.0));

goods.put(3, new Market(3, 1, goods3, 10.0));

Scanner input = new Scanner(System.in);

System.out.println("请输入商品的编号:");

int num = input.nextInt();

System.out.println("请输入商品的数量");

int amount = input.nextInt();

Market market = goods.get(num);

market.setNum(amount);

market.calc();

}

private static void printTable(String row1,String row2,String row3 ) {

System.out.print(row1);

int times=12;

if (row2!="商品") {

times=5;

}

for (int i = 0; i < times; i++) {

System.out.print(" ");

}

System.out.print(row2);

for (int i = 0; i < 10; i++) {

System.out.print(" ");

}

System.out.print(row3);

System.out.println("\n");

}

}
//测试结果：
-------超市计价系统-------
编号 商品 价格

1 可口可乐 3.0￥

2 爆米花 5.0￥

3 益达 10.0￥

请输入商品的编号:
3
请输入商品的数量
5
您消费共计：50.0￥