需求
模拟购物车模块功能，需要实现添加商品到购物车中去，同时需要提供
修改商品的购买数量，结算商品价格功能（请用面向对象编程实现）
分析
购物车中的每个商品都是一个对象，需要定义一个商品类
购物车本身也是个对象：可以使用数组对象代表
完成界面架构，让用户选择操作功能public class Goods {
int id;
String name;
double price;
int numGoods;
}import java.util.Scanner;
public class Test {
public static void main(String[] args) {
//1、定义商品类，用于创建商品对象
//2、定义购物车对象：使用数组对象来表示
Goods[] shopCar = new Goods[100];//[null,null,...]//数组对象
//3、搭建构架
OUT:
while (true) {
System.out.println("请您选择以下指令进行操作：");
System.out.println("添加商品到购物车：add");
System.out.println("查询购物车的商品：query");
System.out.println("修改购买商品数量：update");
System.out.println("结算购物商品价格：pay");
System.out.println("退出购物车：out");
System.out.println("请您输入指令：");
Scanner sc = new Scanner(System.in);
String command = sc.next();
switch (command) {
case "add":
addGoods(shopCar, sc);
break;
case "query":
queryGoods(shopCar);
break;
case "update":
updateGoods(shopCar, sc);
break;
case "pay":
payGoods(shopCar);
break;
case "out":
break OUT;
default:
System.out.println("您输入的指令有误！");
break;
}
}
}
//结算购物车商品购买价格
//商品价格 * 商品数量
private static void payGoods(Goods[] shopCar) {
queryGoods(shopCar);
double prices = 0;
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] != null) {
prices += shopCar[i].price * shopCar[i].numGoods;
} else {
break;
}
}
System.out.println("结算金额：" + prices);
}
//修改购物车商品的数量
//分析：按照商品的编码去查找商品，将这个查找商品的过程使用方法实现
private static void updateGoods(Goods[] shopCar, Scanner sc) {
while (true) {
System.out.println("请输入您要修改商品数量的编号：");
int numGoods = sc.nextInt();
Goods g = getGoods(shopCar, numGoods);//查找需要修改的数组对象
if (g == null) {
System.out.println("购物车没有此商品");
} else {
System.out.println("请输入" + g.name + "商品修改的数量：");
g.numGoods = sc.nextInt();
System.out.println("修改完成！");
queryGoods(shopCar);
break;
}
}
}
//查询购物车
private static void queryGoods(Goods[] shopCar) {
//shopCar[i]=[g1,g2,...];
System.out.println("---------------购物车商品---------------");
System.out.println("编号" + "\t\t\t" + "名称" + "\t\t\t" + "价格" + "\t\t\t" + "数量");
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] != null) {
System.out.println(shopCar[i].id + "\t\t\t" + shopCar[i].name + "\t\t\t" + shopCar[i].price + "\t\t\t" + shopCar[i].numGoods);
} else {
break;
}
}
}
//添加商品到购物车
private static void addGoods(Goods[] shopCar, Scanner sc) {
Goods g = new Goods();
//录入商品信息
System.out.println("请输入添加商品的编号：");
g.id = sc.nextInt();
System.out.println("请输入添加商品的名称：");
g.name = sc.next();
System.out.println("请输入添加商品的价格：");
g.price = sc.nextDouble();
System.out.println("请输入添加商品的数量：");
g.numGoods = sc.nextInt();
//将这个商品信息封装成一个商品对象放进数组对象
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] == null) {
shopCar[i] = g;//将这个商品对象的地址给数组
break;
}
}
System.out.println("您的商品" + g.name + "成功添加进购物车!");
}
//根据编号查找商品信息
public static Goods getGoods(Goods[] shopCar, int num) {
for (int i = 0; i < shopCar.length; i++) {
//Goods g = shopCar[i];
if (shopCar[i] != null) {
if (num == shopCar[i].id) {
return shopCar[i];
}
} else {
return null;
}
}
return null;
}
}使用JavaBean改造购物车
public class Goods {
private int id;
private String name;
private double price;
private int numGoods;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getNumGoods() {
return numGoods;
}
public void setNumGoods(int numGoods) {
this.numGoods = numGoods;
}
}import java.util.Scanner;
public class Test {
public static void main(String[] args) {
//1、定义商品类，用于创建商品对象
//2、定义购物车对象：使用数组对象来表示
Goods[] shopCar = new Goods[100];//[null,null,...]//数组对象
//3、搭建构架
OUT:
while (true) {
System.out.println("请您选择以下指令进行操作：");
System.out.println("添加商品到购物车：add");
System.out.println("查询购物车的商品：query");
System.out.println("修改购买商品数量：update");
System.out.println("结算购物商品价格：pay");
System.out.println("退出购物车：out");
System.out.println("请您输入指令：");
Scanner sc = new Scanner(System.in);
String command = sc.next();
switch (command) {
case "add":
addGoods(shopCar, sc);
break;
case "query":
queryGoods(shopCar);
break;
case "update":
updateGoods(shopCar, sc);
break;
case "pay":
payGoods(shopCar);
break;
case "out":
break OUT;
default:
System.out.println("您输入的指令有误！");
break;
}
}
}
//结算购物车商品购买价格
//商品价格 * 商品数量
private static void payGoods(Goods[] shopCar) {
queryGoods(shopCar);
double prices = 0;
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] != null) {
prices += shopCar[i].getPrice() * shopCar[i].getNumGoods();
} else {
break;
}
}
System.out.println("结算金额：" + prices);
}
//修改购物车商品的数量
//分析：按照商品的编码去查找商品，将这个查找商品的过程使用方法实现
private static void updateGoods(Goods[] shopCar, Scanner sc) {
while (true) {
System.out.println("请输入您要修改商品数量的编号：");
int numGoods = sc.nextInt();
Goods g = getGoods(shopCar, numGoods);//查找需要修改的数组对象
if (g == null) {
System.out.println("购物车没有此商品");
} else {
System.out.println("请输入" + g.getName() + "商品修改的数量：");
g.setNumGoods(sc.nextInt());
System.out.println("修改完成！");
queryGoods(shopCar);
break;
}
}
}
//查询购物车
private static void queryGoods(Goods[] shopCar) {
//shopCar[i]=[g1,g2,...];
System.out.println("---------------购物车商品---------------");
System.out.println("编号" + "\t\t\t" + "名称" + "\t\t\t" + "价格" + "\t\t\t" + "数量");
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] != null) {
System.out.println(shopCar[i].getId() + "\t\t\t" + shopCar[i].getName() + "\t\t\t" + shopCar[i].getPrice() + "\t\t\t" + shopCar[i].getNumGoods());
} else {
break;
}
}
}
//添加商品到购物车
private static void addGoods(Goods[] shopCar, Scanner sc) {
Goods g = new Goods();
//录入商品信息
System.out.println("请输入添加商品的编号：");
g.setId(sc.nextInt());
System.out.println("请输入添加商品的名称：");
g.setName(sc.next());
System.out.println("请输入添加商品的价格：");
g.setPrice(sc.nextDouble());
System.out.println("请输入添加商品的数量：");
g.setNumGoods(sc.nextInt());
//将这个商品信息封装成一个商品对象放进数组对象
for (int i = 0; i < shopCar.length; i++) {
if (shopCar[i] == null) {
shopCar[i] = g;//将这个商品对象的地址给数组
break;
}
}
System.out.println("您的商品" + g.getName() + "成功添加进购物车!");
}
//根据编号查找商品信息
public static Goods getGoods(Goods[] shopCar, int num) {
for (int i = 0; i < shopCar.length; i++) {
//Goods g = shopCar[i];
if (shopCar[i] != null) {
if (num == shopCar[i].getId()) {
return shopCar[i];
}
} else {
return null;
}
}
return null;
}
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