面向对象--购物车

面向对象--购物车

目录

• 面向对象--购物车
  • 代码预览
    • 商品类
    • 商品清单
    • 购物车类（即购物的功能实现）
    • 测试

代码预览

商品类

package ShoppingCart;
public class Product {
	private int id;// 商品编号
	private String name;// 商品名称
	private double price;// 单价

	public Product(int id, String name,double price) {
		this.id = id;
		this.name = name;
		this.price = price;
	}

	@Override
	public String toString() {
		return "Product [id=" + id + ", name=" + name + ", price=" + price + "]";
	}

	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;
	}

	

}

商品清单

package ShoppingCart;
public class ProductItem {
	private Product product;//购买的商品
	private int count;//商品数量

	public ProductItem() {
	}
 
	public ProductItem(Product product, int count) {
		this.product = product;
		this.count = count;
	}
 
	public Product getProduct() {
		return product;
	}
	public void setProduct(Product product) {
		this.product = product;
	}
	public int getCount() {
		return count;
	}
	public void setCount(int count) {
		this.count = count;
	}
	public double totalMoney(){//小计
		double price=product.getPrice();//获取商品单价
		return price*count;
	}


}

购物车类（即购物的功能实现）

package ShoppingCart;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
public class ShoppingCart {
private Map<Integer,ProductItem> map=new LinkedHashMap<Integer,ProductItem>();
	
	public void addProduct(Product p){//添加商品
		int productId=p.getId();
		if(map.containsKey(productId)){ //判断商品编号是否存在
			ProductItem productItem=map.get(productId);
			productItem.setCount(productItem.getCount()+1); //数量增加
		}else{
			map.put(productId, new ProductItem(p,1));//新增商品
		}
	}
	public void showAll(){//查看订单信息
		Collection<ProductItem> productItems = map.values();//获取键值
		Iterator<ProductItem> iterator = productItems.iterator();
		while(iterator.hasNext()){
			ProductItem productItem = iterator.next();
			Product product = productItem.getProduct();
			System.out.println("编号："+product.getId()+",名称："
			+product.getName()+",单价："+product.getPrice()+",数量："+productItem.getCount()
			+",小计："+productItem.totalMoney());
		}
	}
	public boolean deleteProduct(int productId){//删除商品
		if(map.containsKey(productId)){
			map.remove(productId);
			return true;
		}
		return false;
	}
	public boolean modifyProduct(int productId,int count){//修改商品数量
		if(map.containsKey(productId)){
			if(count>=1){
				ProductItem productItem = map.get(productId);
				productItem.setCount(count);
				return true;
			}else if(count==0){//删除某商品
				deleteProduct(productId);
				return true;
			}	
		}
		return false;
	}
	
	public void clearCart(){//清空购物车
		map.clear();
	}
	
	public double totalAllMoney(){//商品总价值
		double total=0;
		Collection<ProductItem> productItems = map.values();
		Iterator<ProductItem> iterator = productItems.iterator();
		while(iterator.hasNext()){
			ProductItem productItem = iterator.next();
			double money=productItem.totalMoney();
			total+=money;
		}
		return total;
	}


}

测试

package ShoppingCart;

import java.util.Scanner;

public class Test {
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		ShoppingCart cart = new ShoppingCart();
		Product p1 = new Product(1, "华硕笔记本", 4599);
		Product p2 = new Product(2, "小米电视机", 2999.9);
		Product p3 = new Product(3, "NIKE外套", 328);// 测试买两件商品的情况
		cart.addProduct(p1);
		cart.addProduct(p2);
		cart.addProduct(p3);
		cart.showAll();
		System.out.println("------------------------");
		System.out.println("请输入你要删除的商品编号:");
		int id=in.nextInt();
		boolean flag = cart.deleteProduct(id);
		if (flag) {
			System.out.println("编号为：" + id + "的商品删除成功！");
		} else {
			System.out.println("删除失败");
		}
		cart.showAll();
		System.out.println("------------------------");
		System.out.println("请输入你要修改的商品编号:");
		int id1=in.nextInt();
		System.out.println("请输入你要修改的商品数量:");
		int count=in.nextInt();
		boolean flag2 = cart.modifyProduct(id1, count);
		if (flag2) {
			System.out.println("编号为：" + id1 + "的商品修改成功！");
		} else {
			System.out.println("修改失败");
		}
		cart.showAll();
		System.out.println("总价为：" + cart.totalAllMoney());
	}

}