动态数组ArrayList的使用

1.定义类

 1 package com.realhope.rmeal.bean;
 2 
 3 /**
 4  * 
 5  * @author Wucy
 6  * 菜谱类
 7  */
 8 public class Menu{ 
 9  private Integer _id;   
10     private Integer typeID;    // 菜单类型
11     private String name;    // 名称
12     private String description;   // 菜谱介绍
13     private Integer price;    // 价格
14     private String unit;    // 单位
15     private String pic;        // 图片路径
16     private String remark;    // 备注
17     
18     
19  public Menu() {
20   super();
21  }
22  
23 
24 
25  public Menu(Integer _id, Integer typeID, String name, String description,
26    Integer price, String unit, String pic, String remark) {
27   super();
28   this._id = _id;
29   this.typeID = typeID;
30   this.name = name;
31   this.description = description;
32   this.price = price;
33   this.unit = unit;
34   this.pic = pic;
35   this.remark = remark;
36  }
37 
38  public String getUnit() {
39   return unit;
40  }
41 
42  public void setUnit(String unit) {
43   this.unit = unit;
44  }
45 
46  public Integer get_id() {
47   return _id;
48  }
49  public void set_id(Integer _id) {
50   this._id = _id;
51  }
52  public Integer getTypeID() {
53   return typeID;
54  }
55  public void setTypeID(Integer typeID) {
56   this.typeID = typeID;
57  }
58  public String getName() {
59   return name;
60  }
61  public void setName(String name) {
62   this.name = name;
63  }
64  public String getDescription() {
65   return description;
66  }
67  public void setDescription(String description) {
68   this.description = description;
69  }
70  public Integer getPrice() {
71   return price;
72  }
73  public void setPrice(Integer price) {
74   this.price = price;
75  }
76  public String getPic() {
77   return pic;
78  }
79  public void setPic(String pic) {
80   this.pic = pic;
81  }
82  public String getRemark() {
83   return remark;
84  }
85  public void setRemark(String remark) {
86   this.remark = remark;
87  }
88     
89 }

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：

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