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