动态数组ArrayList的使用

1.定义类

 package com.realhope.rmeal.bean;

 /**
  *
  * @author Wucy
  * 菜谱类
  */
 public class Menu{
  private Integer _id;
     private Integer typeID;    // 菜单类型
     private String name;    // 名称
     private String description;   // 菜谱介绍
     private Integer price;    // 价格
     private String unit;    // 单位
     private String pic;        // 图片路径
     private String remark;    // 备注

  public Menu() {
   super();
  }

  public Menu(Integer _id, Integer typeID, String name, String description,
    Integer price, String unit, String pic, String remark) {
   super();
   this._id = _id;
   this.typeID = typeID;
   this.name = name;
   this.description = description;
   this.price = price;
   this.unit = unit;
   this.pic = pic;
   this.remark = remark;
  }

  public String getUnit() {
   return unit;
  }

  public void setUnit(String unit) {
   this.unit = unit;
  }

  public Integer get_id() {
   return _id;
  }
  public void set_id(Integer _id) {
   this._id = _id;
  }
  public Integer getTypeID() {
   return typeID;
  }
  public void setTypeID(Integer typeID) {
   this.typeID = typeID;
  }
  public String getName() {
   return name;
  }
  public void setName(String name) {
   this.name = name;
  }
  public String getDescription() {
   return description;
  }
  public void setDescription(String description) {
   this.description = description;
  }
  public Integer getPrice() {
   return price;
  }
  public void setPrice(Integer price) {
   this.price = price;
  }
  public String getPic() {
   return pic;
  }
  public void setPic(String pic) {
   this.pic = pic;
  }
  public String getRemark() {
   return remark;
  }
  public void setRemark(String remark) {
   this.remark = remark;
  }

 }

2.引入包

import java.util.ArrayList;

3.定义数组

private List<Menu> lstDate = new ArrayList<Menu>();

4.使用实例：

  lstDate.clear();//清空数组
  lstDate = new MenuManager(this).queryMenus(type_id);//实例
  PageCount = (int) Math.ceil(lstDate.size() / PAGE_SIZE);// 数组大小