J2ME中输入文本TextBox的常用方法练习

 常用方法：insert、delete、setString、getString、getMaxSize、setMaxSize、size

1. /**
2.  * @作者 Jcuckoo
3.  * @创建日期 2008-11-4
4.  * @版本 V 1.0
5.  */
6. public class TextBox2 extends MIDlet implements CommandListener{
7.     //声名一个屏幕管理对象
8.     private Display display;
9.     //声名一个textBox，用来显示信息
10.     private TextBox textBox;
11.     private Command maxCommand;
12.     private Command addCommand;
13.     private Command getCommand;
14.     private Command insertCommand;
15.     private Command deleteCommand;
16.     private Command exitCommand;
17.     public TextBox2() {
18.         //获取屏幕管理对象
19.         display=Display.getDisplay(this);
20.         //初始化文本框及相关按钮
21.         textBox=new TextBox("TextBox测试","",200,TextField.ANY);
22.         insertCommand=new Command("在第三个位置插入信息",Command.SCREEN,1);
23.         deleteCommand=new Command("从3～6删除",Command.SCREEN,1);
24.         exitCommand=new Command("退出",Command.EXIT,1);
25.         maxCommand=new Command("获取最大容量",Command.SCREEN,1);
26.         addCommand=new Command("容量添加10",Command.SCREEN,1);
27.         getCommand=new Command("获取当前的容量",Command.SCREEN,1);
28.         //将按钮添加到文本框
29.         textBox.addCommand(exitCommand);
30.         textBox.addCommand(insertCommand);
31.         textBox.addCommand(deleteCommand);
32.         textBox.addCommand(maxCommand);
33.         textBox.addCommand(addCommand);
34.         textBox.addCommand(getCommand);
35.         //事件监听注册
36.         textBox.setCommandListener(this);
37.     }
38.     protected void destroyApp(boolean arg0)  {
39.     }
40.     protected void pauseApp() {
41.     }
42.     protected void startApp() throws MIDletStateChangeException {
43.         display.setCurrent(textBox);
44.     }
45.     public void commandAction(Command c, Displayable d) {
46.         //退出判断
47.         if(c==exitCommand){
48.             destroyApp(false);
49.             notifyDestroyed();
50.         }
51.         //insert测试
52.         if(c==insertCommand){
53.             textBox.insert("插入信息测试", 3);
54.         }
55.         //delete测试
56.         if(c==deleteCommand){
57.             textBox.delete(3, 6);
58.         }
59.         //setString与getMaxSize测试
60.         if(c==maxCommand){
61.             textBox.setString("当前最大容量是："+textBox.getMaxSize());
62.         }
63.         //setMaxSize测试
64.         if(c==addCommand){
65.             textBox.setMaxSize(textBox.getMaxSize()+10);
66.             textBox.setString("当前最大容量是："+textBox.getMaxSize());
67.         }
68.         //size测试
69.         if(c==getCommand){
70.             textBox.setString("当前的容量是："+textBox.size());
71.         }
72.     }
73. }