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;	}			}