cartitem.java

IBM提供的购物车

package com.webshop.domain;

import java.io.*;
import java.math.*;

/**
 * @author w
 *
 * To change this generated comment edit the template variable "typecomment":
 * Window>Preferences>Java>Templates.
 * To enable and disable the creation of type comments go to
 * Window>Preferences>Java>Code Generation.
 */
public class CartItem implements Serializable {

  /* 私有字段 */

  private Item item;
  private int quantity;
  private BigDecimal total;

  /* JavaBeans 属性 */
 
  public BigDecimal getTotal() { return total; }

  public Item getItem() { return item; }

  /**设置Item，同时计算总价格**/
  public void setItem(Item item) {
    this.item = item;
    calculateTotal();
  }

  public int getQuantity() { return quantity; }
  
  /**设置数量，同时计算总价格**/
  public void setQuantity(int quantity) {
    this.quantity = quantity;
    calculateTotal();
  }

  /* Public methods */
  /** 增加item的数量**/
  public void incrementQuantity() {
    quantity++;
    calculateTotal();
  }

  /**
   * 计算item的金额
   */

  private void calculateTotal() {
    if (item != null && item.getListPrice() !=0.0f) {
      total = new BigDecimal(item.getListPrice()).multiply(new BigDecimal(quantity));
    } else {
      total = null;
    }
  }

}