为什么输入商品编号以后显示找不到商品

public class Goods {

private String goodsId;//商品编号

private String goodsName;//商品名称

private double price;//商品价格

private String goodsDesp;//商品描述

//Goods类的构造方法

public Goods(String goodsId, String goodsName, double price, String goodsDesp) {

super();

this.goodsId = goodsId;

this.goodsName = goodsName;

this.price = price;

this.goodsDesp = goodsDesp;

}

//成员属性的getter setter方法

public String getGoodsId() {

return goodsId;

}

public void setGoodsId(String goodsId) {

this.goodsId = goodsId;

}

public String getGoodsName() {

return goodsName;

}

public void setGoodsName(String goodsName) {

this.goodsName = goodsName;

}

public double getPrice() {

return price;

}

public void setPrice(double price) {

this.price = price;

}

public String getGoodsDesp() {

return goodsDesp;

}

public void setGoodsDesp(String goodsDesp) {

this.goodsDesp = goodsDesp;

}

//hashcode() equals()方法

@Override

public int hashCode() {

final int prime = 31;

int result = 1;

result = prime * result + ((goodsDesp == null) ? 0 : goodsDesp.hashCode());

result = prime * result + ((goodsId == null) ? 0 : goodsId.hashCode());

result = prime * result + ((goodsName == null) ? 0 : goodsName.hashCode());

long temp;

temp = Double.doubleToLongBits(price);

result = prime * result + (int) (temp ^ (temp >>> 32));

return result;

}

@Override

public boolean equals(Object obj) {

if (this == obj)

return true;

if (obj == null)

return false;

Goods other = (Goods) obj;

if (goodsId == null) {

if (other.goodsId != null)

return false;

} else if (!goodsId.equals(other.goodsId))

return false;

return true;

}

//重写toString方法

@Override

public String toString() {

return "[商品编号：" + goodsId + "，商品名称：" + goodsName + "，商品价格：" + price + "商品描述："

+ goodsDesp + "]";

}

}

public class GoodsIntCart {

private Goods goods;

private int num;

//构造方法

public GoodsIntCart(Goods goods, int num) {

this.setGoods(goods);

this.setNum(num);

}

//getter setter方法

public Goods getGoods() {

return goods;

}

public void setGoods(Goods goods) {

this.goods = goods;

}

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

@Override

public String toString() {

return 

goods+"，数量："+num;

}

}

import java.util.HashSet;

import java.util.Iterator;

import java.util.Set;

public class GoodsManage {

Set<Goods> goodsSet=new HashSet<Goods>();

//构造方法

public GoodsManage() {

}

//getter setter方法

public Set<Goods> getGoodsSet() {

return goodsSet;

}

public void setGoodsSet(Set<Goods> goodsSet) {

this.goodsSet = goodsSet;

}

//商品信息导入

public void importGoods() {

Goods goods1=new Goods("s01", "键盘", 1299, "");

Goods goods2=new Goods("s02", "鼠标", 20, "");

Goods goods3=new Goods("s03", "洗衣粉", 50, "");

Goods goods4=new Goods("s04", "苹果", 1, "");

goodsSet.add(goods1);

goodsSet.add(goods2);

goodsSet.add(goods3);

goodsSet.add(goods4);

}

//显示所有商品信息

public void displayAllGoods(GoodsManage use) { 

use.importGoods();

Iterator<Goods> gmit=goodsSet.iterator();

while(gmit.hasNext()) {

System.out.println(gmit.next());

}

}

}

import java.io.ObjectOutputStream.PutField;

import java.util.HashMap;

import java.util.Iterator;

import java.util.Map;

import java.util.Map.Entry;

import java.util.Set;

public class ShoppingCart {

Goods goods;

GoodsIntCart gis;

String str;

int num;

Map<String, GoodsIntCart> mapcart=new HashMap<String,GoodsIntCart>();

//添加商品到购物车

public void addGoodsToCart(GoodsManage gm) {

gm.displayAllGoods(gm);

gm.setGoodsSet(gm.goodsSet);

if(mapcart.containsKey(str)) {

System.out.println("商品已在购物车中，不可重复添加");

//break;

}else if(gm.getGoodsSet().contains(this.getStr())) {

gis= new GoodsIntCart(goods, num);

System.out.println("添加成功~");

mapcart.put(this.str, gis);

for (Goods g : gm.getGoodsSet()) {

if (g.getGoodsId().equals("s01")) {

goods = g;

break;

}

}

}else if(!gm.goodsSet.contains(this.getStr())) {

System.out.println("你输入的商品编号不存在");

}

//break;

}

//修改购物车中的商品数量

public void updateNumInCart() {

}

//显示购物车中的所有商品

public void displayAllInCart() {

Set<Entry<String, GoodsIntCart>> e=mapcart.entrySet();

for(Entry<String, GoodsIntCart> ey:e) {

System.out.println(ey.getValue().getGoods());

}

}

//结算

public void settleAccounts() {

}

//构造方法

public ShoppingCart() {

}

//setter getter方法

public Map<String, GoodsIntCart> getMapcart() {

return mapcart;

}

public void setMapcart(Map<String, GoodsIntCart> mapcart) {

this.mapcart = mapcart;

}

public String getStr() {

return str;

}

public void setStr(String str) {

this.str=str;

}

public int getNum() {

return num;

}

public void setNum(int num) {

this.num = num;

}

}

import java.util.Scanner;

public class TestDemo {

//主菜单

public void menu() {

System.out.println("********************* ");

System.out.println("*     **主菜单**      * ");

System.out.println("*     1--商品管理             *");

System.out.println("*     2--购物车                 *");

System.out.println("*     0--退出                     *");

System.out.println("**********************");

}

//商品管理菜单

public void manage() {

System.out.println("***********************");

System.out.println("     **商品管理**        ");

System.out.println("     1--商品信息导入              ");

System.out.println("     2--显示所有商品信息       ");

System.out.println("     9--返回上一级菜单           ");

System.out.println("***********************");

} 

//购物车管理菜单

public void cartManage() {

System.out.println("********************************");

System.out.println("     **购物车管理**                ");

System.out.println("     1--添加商品到购物车                              ");

System.out.println("     2--修改购物车中的商品数量                    ");

System.out.println("     3--显示购物车中所有商品的信息             ");

System.out.println("     4--结算                                                    ");

System.out.println("     9--返回上一级菜单                                  ");

System.out.println("********************************");

} 

public static void main(String[] args) {

Scanner sc=new Scanner(System.in);

TestDemo menuuse=new TestDemo();

Goods goods=null;

ShoppingCart spc=new ShoppingCart();

//1--商品信息导入  

GoodsManage gmuse=new GoodsManage();

//2--显示所有商品信息

gmuse.displayAllGoods(gmuse);

//添加商品到购物车

System.out.println("请输入商品编号：");

spc.setStr(sc.next());

System.out.println("请输入商品数量：");

spc.setNum(sc.nextInt());

spc.addGoodsToCart(gmuse);

//3--显示购物车中所有商品的信息

//spc.displayAllInCart();

}

}