添加商品到购物车程序终止了，请老师解答一下
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import java.util.Scanner;
import java.util.Set;
/**
* 购物车类
* @author xiaod
*
*/
public class ShoppingCart {
//属性
Map<String,GoodsInCart> shoppingCart=new HashMap<String,GoodsInCart>();
//构造方法
public void ShoppingCart(Map<String, GoodsInCart> shoppingCart) {
// super();
this.shoppingCart = shoppingCart;
}
//getter和setter方法
public Map<String, GoodsInCart> getShoppingCart() {
return shoppingCart;
}
public void setShoppingCart(Map<String, GoodsInCart> shoppingCart) {
this.shoppingCart = shoppingCart;
}
//添加商品到购物车
public void addGoodsToCart(GoodsManage gm,Set<Goods>goodsSet) {
if(gm.getGoodsSet().size()==0) {
System.out.println("请先导入商品信息！");
}else {
System.out.println("添加商品到购物车：");
System.out.println("所有商品信息为：");
gm.displayAllGoods(goodsSet);
System.out.println("请输入要添加的商品编号：");
Scanner sc=new Scanner(System.in);
String goodsId=sc.next();
Iterator<Goods> it=gm.getGoodsSet().iterator();
boolean flag=false;
Goods goods=null;
while(it.hasNext()) {
goods=it.next();
if(goods.getGoodsId().equals(goodsId)) {
flag=true;
break;
}
}
if(flag) {
System.out.println("请输入要添加的商品数量：");
int num=sc.nextInt();
if(num!=0) {
GoodsInCart gic=new GoodsInCart(goods,num);
shoppingCart.put(goodsId, gic);
}else {
System.out.println("商品数量不为零！");
}
}else {
System.out.println("请输入正确的商品编号！");
}
}
}
//修改购物车中商品的数量
public void updateNumInCart() {
if(shoppingCart.size()==0) {
System.out.println("购物车中暂无商品信息，请先添加商品！");
}else {
System.out.println("修改购物车中商品的数量");
System.out.println("请输入要修改商品的编号");
Scanner sc=new Scanner(System.in);
String goodsId=sc.next();
Iterator<GoodsInCart> itGoodsInCart=shoppingCart.values().iterator();
boolean flag=false;
Goods goods=null;
while(itGoodsInCart.hasNext()) {
goods=itGoodsInCart.next().getGoods();
if(goods.getGoodsId().equals(goodsId)) {
flag=true;
break;
}
}
}
}
//显示购物车中的所有商品
public void displayAllInCart(){
if(shoppingCart.values().size()==0) {
System.out.println("购物车中暂无商品信息，请先添加商品！");
}else {
System.out.println("显示购物车中的所有商品信息");
Iterator<GoodsInCart> itGoodsInCart = shoppingCart.values().iterator();
while(itGoodsInCart.hasNext()) {
System.out.println(itGoodsInCart.next());
}
}
}
//结算
public void settleAccounts() {
System.out.println("结算");
double sum=0;
System.out.println("商品的总价为："+sum);
Iterator<GoodsInCart> it=shoppingCart.values().iterator();
while(it.hasNext()) {
GoodsInCart gic=it.next();
Goods g=gic.getGoods();
System.out.println("商品信息[编号："+g.getGoodsId()+",名称："+g.getGoodsName()+",价格："
+g.getPrice()+",商品描述："+g.getGoodsDesp()+",数量："+gic.getNum()+"]");
double sum1=g.getPrice()*gic.getNum();
sum=sum+sum1;
}
}
}54
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9回答
一叶知秋519
2017-10-22 00:04:55
在addGoodsToCart方法中，对商品库是否为空的判断改为goodsSet.size()==0；将测试类中manageGoods方法中的GoodsManage类的对象去掉，保证前后操作的是同一个GoodsManage；另外你的测试类中，manageShoppingCart方法依旧和manageGoods方法一样，使用递归调用来保证程序的连贯性；即
switch(num) {
case 1:
// goodsManage.displayAllGoods(goodsSet);
shoppingCart.addGoodsToCart(goodsManage,goodsSet);
this.manageShoppingCart();
break;
case 2:
shoppingCart.updateNumInCart();
this.manageShoppingCart();
break;
case 3:
shoppingCart.displayAllInCart();
this.manageShoppingCart();
break;
case 4:
shoppingCart.settleAccounts();
this.manageShoppingCart();
break;
case 9:
mainMenu();
break;
}祝学习愉快～
无厘头的童年
2017-10-21 23:36:38
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
//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;
}
//getter和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()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;
}
//equals()方法
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
Goods other = (Goods) obj;
if (goodsDesp == null) {
if (other.goodsDesp != null)
return false;
} else if (!goodsDesp.equals(other.goodsDesp))
return false;
if (goodsId == null) {
if (other.goodsId != null)
return false;
} else if (!goodsId.equals(other.goodsId))
return false;
if (goodsName == null) {
if (other.goodsName != null)
return false;
} else if (!goodsName.equals(other.goodsName))
return false;
if (Double.doubleToLongBits(price) != Double.doubleToLongBits(other.price))
return false;
return true;
}
@Override
public String toString() {
return "商品信息 [编号：" + goodsId + ", 名称：" + goodsName + ", 价格：" + price + ", 描述："
+ goodsDesp + "]";
}
}
无厘头的童年
2017-10-21 23:36:03
public class GoodsInCart {
//属性
private Goods goods; //商品信息
private int num; //商品数量
//构造方法
public GoodsInCart(Goods goods, int num) {
super();
this.goods = goods;
this.num = num;
}
//getter和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;
}
}
无厘头的童年
2017-10-21 23:35:24
import java.util.HashSet;
import java.util.Scanner;
import java.util.Set;
/**
* 测试类
* @author xiaod
*
*/
public class TestDemo {
private Set<Goods> goodsSet=new HashSet<Goods>();
private ShoppingCart shoppingCart=new ShoppingCart(); //初始化购物车
GoodsManage goodsManage=new GoodsManage();
//商品管理
public void manageGoods() {
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("==============================================");
System.out.println("请输入对应的数字对商品进行管理：");
Scanner src = new Scanner(System.in);
int num = src.nextInt();
GoodsManage goodsManage=new GoodsManage();
//根据商品编号执行操作
switch(num) {
case 1:
goodsManage.importGoods(goodsSet);
this.manageGoods();
break;
case 2:
goodsManage.displayAllGoods(goodsSet);
this.manageGoods();
break;
case 9:
mainMenu();
break;
}
}
//购物车管理
public void manageShoppingCart() {
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--修改购物车中的所有商品数量");
System.out.println("3--显示购物车中的所有商品信息");
System.out.println("4--结算");
System.out.println("9--返回上一级菜单");
System.out.println("==============================================");
System.out.println("请输入对应的数字对购物车进行管理");
Scanner src=new Scanner(System.in);
int num=src.nextInt();
//根据编号执行操作
switch(num) {
case 1:
goodsManage.displayAllGoods(goodsSet);
shoppingCart.addGoodsToCart(goodsManage,goodsSet);
break;
case 2:
shoppingCart.updateNumInCart();
break;
case 3:
shoppingCart.displayAllInCart();
break;
case 4:
shoppingCart.settleAccounts();
break;
case 9:
mainMenu();
break;
}
}
//主菜单方法
public void mainMenu() {
//开始进入点
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("==================");
System.out.println("请输入对应的数字操作：");
Scanner src=new Scanner(System.in);
int num = src.nextInt();
//根据编号执行操作
switch(num) {
case 1:
manageGoods();
break;
case 2:
manageShoppingCart();
break;
case 0:
break;
}
}
public static void main(String[] args) {
TestDemo demo=new TestDemo();
demo.mainMenu();
}
}
无厘头的童年
2017-10-20 19:35:44
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;
/**
* 商品管理类
* @author xiaod
*
*/
public class GoodsManage {
//属性
private Set<Goods> goodsSet=new HashSet<Goods>(); //存放商品的容器
//构造方法
public GoodsManage() {
}
public GoodsManage(Set<Goods> goodsSet) {
super();
this.goodsSet = goodsSet;
}
//getter和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(Set<Goods> goodsSet) {
goodsSet.add(new Goods("goods004","手机",2300,"Android手机"));
goodsSet.add(new Goods("goods002","饮水机",299,"带净化功能的饮水机"));
goodsSet.add(new Goods("goods003","笔记本电脑",4999,"15寸笔记本电脑"));
goodsSet.add(new Goods("goods001","水杯",56, "不锈钢水杯"));
System.out.println("商品信息导入");
System.out.println("导入成功!");
}
//显示所有商品信息
public void displayAllGoods(Set<Goods> goodsSet) {
System.out.println("显示所有商品信息\n所有商品信息为：");
Iterator it=goodsSet.iterator();
while(it.hasNext()) {
System.out.println(it.next());
}
}
}请老师看一下
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