购物车
cn.oop.shopping.dao:数据访问接口
cn.oop.shopping.dao.impl:数据访问接口实现类
cn.oop.shopping.entity:实体类
cn.oop.shopping.test:测试类
/**
*实体类：封装对象，一个Product对象可以描述一个商品
*属性多了可以考虑用类来存
*对象多了可以考虑用集合或数组来存
*/
1.创建菜单
cn.oop.shopping.entity:实体类
public class Product{
private int id;//编号
private String name;//名称
private double price;//价格
private String color;//颜色
private int size;//尺寸
private int stock;//库存
public Product(){//无参构造
super()
}
public Product(int id ,String name,double price, String color,int size,int stock){
this.id =id;//有参构造 this关键字 区分类变量和局部变量
this.name=name;
this.price=price;
this.color= color;
this.size=size;
this.stock;
}
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 getProce(){
return proce;
}
public void setProce(double proce){
this.proce=proce;
}
public String getColor(){
return color;
}
public void setColor(String color){
this.color=color;
}
public int getSize(){
return size;
}
public void setSize(int size){
this.size=size;
}
public int getStock(){
return stock;
}
public void setStock(int stock){
this.stock=stock;
}
public String toString() {
return "Product [id=" + id + ", name=" + name + ", price=" + price + ", color=" + color + ", size=" + size
+ ", stock=" + stock + "]";
}
}
package cn.oop.shopping.dao;
public interface ProductDao{//创建接口
//查看所有商品
public List findAll();//放进一个可扩展的List集合中展示
//根据编号查询商品信息
public Product finById(int id);//Product商品类
//添加商品
public boolean addProduct(Product product);//product 封装了要添加的商品信息
}
package cn.oop.shopping.dao.impl;//包名
import java.util.ArrayList;//使用的工具类
import java.util.List;
import cn.zzsxt.shopping.dao.ProductDao;//引入的包
import cn.zzsxt.shopping.entity.Product;
public class ProductDaoImpl implements ProdusDao{
List<Product> list =new ArrayList<Product>();//成员变量
public ProductDaoImpl(){//构造函数
Product p1=new Product (001,"华为手机",1899,"土豪金",5,500);
Product p2=new Product (002,"小米手机",2499,"白色",6,200);
Product p3=new Product (003,"vivo手机",2100,"黑色",6,300);
list.add(p1);//添加到集合中
list.add(p2);
list.add(p3);
}
public List findAll(){
return list;//输出集合内容
}
public Product findById(int id){
for(Product f:list){//遍历
if(f.getId()==id){
return f;
}
}
return null;
}
public boolean addProduct(Product product){
//判断商品是否存在
for(Product p:list){
if(product.getId()==p.getId()){
return false;
}
}
list.add(product);
return true;
}
}
package cn.oop.shopping.entity;
// CartItem封装购买的一个商品信息及对应的数量
public class CartItem {
private int id;//商品编号
private String name;//商品名称
private double price;//商品价格
private int amount;//购买数量
public CartItem() {
super();
// TODO Auto-generated constructor stub
}
public CartItem(int id, String name, double price, int amount) {
super();
this.id = id;
this.name = name;
this.price = price;
this.amount = amount;
}
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 getAmount() {
return amount;
}
public void setAmount(int amount) {
this.amount = amount;
}
public String toString() {
return "CartItem [id=" + id + ", name=" + name + ", price=" + price + ", amount=" + amount + "]";
}
public int hashCode() {
final int prime = 31;
int result = 1;
result = prime * result + amount;
result = prime * result + id;
result = prime * result + ((name == null) ? 0 : name.hashCode());
long temp;
temp = Double.doubleToLongBits(price);
result = prime * result + (int) (temp ^ (temp >>> 32));
return result;
}
public boolean equals(Object obj) {
if (this == obj)
return true;
if (obj == null)
return false;
if (getClass() != obj.getClass())
return false;
CartItem other = (CartItem) obj;
if (amount != other.amount)
return false;
if (id != other.id)
return false;
if (name == null) {
if (other.name != null)
return false;
} else if (!name.equals(other.name))
return false;
if (Double.doubleToLongBits(price) != Double.doubleToLongBits(other.price))
return false;
return true;
}
}
package cn.oop.shopping.dao;
import java.util.Map;
import cn.oop.shopping.entity.CartItem;
public interface CartItemDao{
//购买记录
public boolean addCartItem(CarItem cartItem);
//查询购物车中商品信息
public Map<Integer,CartItem> showCart();
}
package cn.oop.shopping.dao.impl;
import java.util.LinkedHashMap;
import java.util.Map;
import cn.oop.shopping.dao.CartItemDao;
import cn.oop.shopping.entity.CartItem;
public class CartItemDaoImpl implements CartItemDao{
//购物车:用商品编号做key,利用购物车项(编号,名称,价格,数量)
Map<Integer,CartItem> cart=new LinkedHashMap<Integer,CartItem>();
/**
* 添加购物车
* a.购物车中不存在要添加的商品信息(直接添加)
b.购物车中存在要添加的商品信息(更改数量)
*/
public boolean addCartItem(CartItem cartItem){
//判断该购物车中是否存在要添加的商品信息
if(cart.containsKey(cartItem.getId())){
//购物车中已经存在要添加的商品
//获取新添加到购物车中的商品数量
int newAmount=cartItem.getAmount());
CartItem oldCartItem = cart.get(cartItem.getId());//获取原有购物车中商品的信息
int oldAmount=oldCartItem.getAmount();
int amount =oldAmount+newAmount;
oldCartItem.setAmount(amount);//更改购物车中的商品数量
}else{
//购物车中不存在要购买的商品
cart.put(cartItem.getId(),cartItem);//将商品添加到购物车中
}
return true;
}
//查看购物车
public Map<Integer,CartItem> showCart(){
return cart;
}
}
package cn.oop.shopping.test;
import java.util.Collection;
import java.util.List;
import java.util.Map;
import java.util.Scanner;
import cn.oop.shopping.dao.CartItemDao;
import cn.oop.shopping.dao.ProductDao;
import cn.oop.shopping.dao.impl.CartItemDaoImpl;
import cn.oop.shopping.dao.impl.ProductDaoImpl;
import cn.oop.shopping.entity.CartItem;
import cn.oop.shopping.entity.Product;
public class Test{
ProductDao productDao =new ProductDaoImpl();//向上转型
CartItemDao cartItemDao=new CartItemDaoImpl();
//打印菜单
public void startMenu(){
Scanner input =new Scanner(System.in);
public void startMenu(){
Scanner input = new Scanner(System.in);
do{
System.out.println();
System.out.println("*****欢迎进入京东商城*****");
System.out.println("1.添加商品");
System.out.println("2.查看所有商品");
System.out.println("3.查看指定编号商品");
System.out.println("4.添加到购物车");
System.out.println("5.显示购物车");
System.out.println("6.退出");
System.out.println("***************************");
System.out.println("请选择菜单：");
int choice = input.nextInt();
switch (choice) {
case 1:
// System.out.println("添加商品功能");
addProduct();
break;
case 2:
// System.out.println("查看所有商品功能");
showAll();
break;
case 3:
// System.out.println("查看指定编号商品功能");
showById();
break;
case 4:
// System.out.println("添加到购物车功能");
addCart();//添加购物车
break;
case 5:
// System.out.println("显示购物车功能");
showCart();
break;
case 6:
System.out.println("谢谢使用!");
System.exit(1);//终止菜单
break;
default:
System.out.println("您输入的有误，请输入1~6的数字!");
break;
}
}while(true);
}
}
//获取所有商品信息
public void showAll(){
List<Product>list =productDao.findAll();
System.out.println("编号\t\t商品名称\t\t价格\t\t颜色\t\t尺寸\t\t库存");
for (Product product : list) {
int id = product.getId();
String name=product.getName();
double price = product.getPrice();
String color = product.getColor();
int size = product.getSize();
int stock = product.getStock();
System.out.println(id+"\t\t"+name+"\t\t"+price+"\t\t"+color+"\t\t"+size+"\t\t"+stock);
}
}
//根据用户输入的编号查询信息.
public void showById(){
Scanner input =new Scanner(System.in);
System,out,println("请输入商品编号");
int id=input.newxInt();
Product product=productDao.findById(id);
if(product!=null){
System.out.println("编号\t\t商品名称\t\t价格\t\t颜色\t\t尺寸\t\t库存");
String name=product.getName();
double price = product.getPrice();
String color = product.getColor();
int size = product.getSize();
int stock = product.getStock();
System.out.println(id+"\t\t"+name+"\t\t"+price+"\t\t"+color+"\t\t"+size+"\t\t"+stock);
}else{
System.out.println("商品不存在");
}
}
//添加商品的方法
public void addProduct(){
Scanner input = new Scanner(System.in);
System.out.println("请输入商品编号：");
int id = input.nextInt();
System.out.println("请输入商品名称：");
String name = input.next();
System.out.println("请输入商品价格：");
double price = input.nextDouble();
System.out.println("请输入商品颜色：");
String color = input.next();
System.out.println("请输入商品尺寸：");
int size = input.nextInt();
System.out.println("请输入商品库存：");
int stock = input.nextInt();
Product product =new Product(id,name,price,color,size,stock);
boolean isSucc=productDao.addProduct(product);
if(isSucc){
System.out.println("添加成功!");
}else{
System.out.println("商品无法重复添加!");
}
}
//将要购买的商品添加到购物车中
public void addCart(){
Scanner input =new Scanner(System.in);
System.out.println("请输入商品编号");
int id=input.nextInt();
System.out.println("请输入数量")；
int amount=input.nextInt;
//根据商品编号获取商品信息 CartItem(编号,名称,价格,数量)
Product product=productDao.findById(id);
if(product!=null){
String name=product.getName();
double price =product.getProduct();
//将商品编号，商品名称,价格,数量封装成CartItem
CartItem carItem=new CartItem(id,name.price,amount);
//将cartItem添加到购物车中
cartItemDao.addCartItem(cartItem);
}else{
System.out.println("你输入商品编号有误!");
}
}
//显示购物车
public void showCart(){
double total=0;
//获取商品信息
Map<Integer,CartItem> cartItem=cartItemDao.showCart();
Collection<CartItem> cartValue=cart.value();//获取购物车中的值
System.out.println("编号\t\t商品名称\t\t商品价格\t\t数量\t\t小计");
for (CartItem cartItem : cartValues) {
int id = cartItem.getId();
String name = cartItem.getName();
double price = cartItem.getPrice();
int amount = cartItem.getAmount();
double oneTotal = price*amount;//计算小计金额
total+=oneTotal;//计算总金额
System.out.println(id+"\t\t"+name+"\t\t"+price+"\t\t"+amount+"\t\t"+oneTotal);
}
System.out.println("总计:"+total);
}
public static void main(String[] args) {
Test test = new Test();
test.startMenu();
}
}
