item.java

这是一个购物车的源码

package com.tarena.shoppingcart.entity;
import java.io.*;

public class Item implements Serializable {
	private Integer id;
	private Product product;
	private Integer number;
	private double cost;

	public void setNumber(Integer number) {
		this.number = number;
	}
	public Item(Product product, Integer number, double cost) {
		super();
		this.product = product;
		this.number = number;
		this.cost = cost;
	}
	public Item() {
		super();
	}
	public double getCost() {
		return cost;
	}
	public void setCost(double cost) {
		this.cost = cost;
	}
	public Integer getId() {
		return id;
	}
	public void setId(Integer id) {
		this.id = id;
	}
	public Integer getNumber() {
		return number;
	}
	public void setNumber(int number) {
		this.number = number;
	}
	public Product getProduct() {
		return product;
	}
	public void setProduct(Product product) {
		this.product = product;
	}
	@Override
	public int hashCode() {
		final int PRIME = 31;
		int result = 1;
		result = PRIME * result + ((id == null) ? 0 : id.hashCode());
		result = PRIME * result + ((product == null) ? 0 : product.hashCode());
		return result;
	}
	@Override
	public boolean equals(Object obj) {
		if (this == obj)
			return true;
		if (obj == null)
			return false;
		if (getClass() != obj.getClass())
			return false;
		final Item other = (Item) obj;
		if (id == null) {
			if (other.id != null)
				return false;
		} else if (!id.equals(other.id))
			return false;
		if (product == null) {
			if (other.product != null)
				return false;
		} else if (!product.equals(other.product))
			return false;
		return true;
	}
	@Override
	public String toString() {
		
		return product.getName()+":"+product.getDescription()+number+cost;
	}
	
	
	
}