J2ME 常用组件测试

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import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.TextBox;
import javax.microedition.lcdui.TextField;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
/*
 		注：一个TextBox 必须附加一个命令，否则，用户将不能激发任何行为
 		六种限制类型：TextField.ANY  TextField.EMAILADDR  TextField.NUMERIC  TextField.DECIMAL
 					 TextField.PHONENUMBER  TextField.URL
 			
 *
 *
 */

//组件测试  用户输入数据
public class TextBox_test extends MIDlet implements CommandListener {
	private Display display;
	public TextBox_test(){
		super();
		//初始化对象
		display = Display.getDisplay(this);
	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		
	}

	protected void pauseApp() {
		// TODO Auto-generated method stub
		
	}

	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		//textBox 组件测试
		//四个参数代表的意思：title,默认值，最大程度，类型
		TextBox tb = new TextBox("记事本","",200,TextField.ANY);
		tb.addCommand(new Command("确定",Command.OK,1));
		tb.setCommandListener(this);
		display.setCurrent(tb);
	}

	public void commandAction(Command c, Displayable d) {
		// TODO Auto-generated method stub
		if(c.getLabel().equals("确定")){
			TextBox tb = (TextBox)d;
			int maxValue = tb.getMaxSize();
			String content = tb.getString();
			System.out.println("内容:"+content);
		}
	}

}