【Java】购物超市

小明去超市买东西，所有买到的东西都放在了购物车之中，最后到收银台一起结账。

package chapter6;


public class Job6 {

	public static void main(String[] args) {
		// TODO Auto-generated method stub
		ShoppingCart ps = new ShoppingCart(2);
		ps.add(new Phone("iphone5",1,1000));
		ps.add(new Computer("huashuo",2,2000));

		ps.del("huashuo");
		ps.printCart();
		System.out.println(Shop.paymen(ps));
	}
	
	public static Commodity[] delete(int i, Commodity[] c)
	{
		Commodity[] cnew = new Commodity[c.length-1];
		for(int j=0;j<c.length-1;j++)
		{
			if(j<i)
			{
				cnew[j] = c[j];
			}
			else
			{
				cnew[j] = c[j+1];
			}
			
		}
		return cnew;
	}

}
interface Commodity
{
	public String getName();
	public int getAmount();
	public double getPrice();
}

class Phone implements Commodity
{
	private String name;
	private int amount;
	private double price;
	
	public Phone(String name, int amount, double price) {
		super();
		this.name = name;
		this.amount = amount;
		this.price = price;
	}

	public String getName() {
		return name;
	}

	public int getAmount() {
		return amount;
	}

	public double getPrice() {
		return price;
	}
	
}

class Computer implements Commodity
{
	private String name;
	private int amount;
	private double price;
	public Computer(String name, int amount, double price) {
		super();
		this.name = name;
		this.amount = amount;
		this.price = price;
	}
	public String getName() {
		return name;
	}
	public int getAmount() {
		return amount;
	}
	public double getPrice() {
		return price;
	}
	
}


class ShoppingCart
{
	private Commodity[] goods;
	private int foot;
	
	public ShoppingCart(int len)
	{
		if(len>0)
			this.goods = new Commodity[len];
		else 
			this.goods = new Commodity[1];
	}
	public boolean add(Commodity commodity)
	{
		if(this.foot<this.goods.length)
		{
			this.goods[this.foot] = commodity;
			this.foot++;
			return true;
		}
		else
		{
			return false;
		}
	}
	public boolean del(String name)
	{
		int t = 0;
		Commodity[] goodsnew = null;
		for(int i = 0;i<this.goods.length;i++)
		{
			if(this.goods[i]!=null)
			{
				if(this.goods[i].getName().indexOf(name)!=-1)
				{
					goodsnew = Job6.delete(i, this.goods);
					t = 1;
				}
			}
		}
		if(t==1)
		{
			this.goods = goodsnew;
			this.foot--;
			return true;
		}
		else
			return false;
	}

	public void printCart()
	{
		for(int i=0;i<this.goods.length;i++)
		{
			if(this.goods[i]!=null)
				System.out.println(goods[i].getName()+','+goods[i].getAmount()+','+goods[i].getPrice());
		}
	}
	public Commodity[] getGoods() {
		return goods;
	}
	public int getFoot() {
		return foot;
	}

	
}

class Shop
{
	public static  double paymen(ShoppingCart sc)
	{
		double sum  = 0;
		for(int i=0;i<sc.getGoods().length;i++)
		{
			sum += sc.getGoods()[i].getPrice() * sc.getGoods()[i].getAmount();
		}
		return sum;
	}

}