midlet6.java

这是郭克华老师的J2ME视频的源代码

package prj8_1;

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;

public class MIDlet6 extends MIDlet implements CommandListener{

	private TextBox tbx = new TextBox("输入一个数字","",10,TextField.ANY);
	private Display dis;
	private Command cmd = new Command("打印平方",Command.SCREEN,1);
	
	public MIDlet6() {
		// TODO Auto-generated constructor stub
	}
	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		dis = Display.getDisplay(this);
		dis.setCurrent(tbx);
		tbx.addCommand(cmd);
		
		tbx.setCommandListener(this);
	}
	
	public void commandAction(Command c,Displayable d){
		String str = tbx.getString();
		try{
			this.print(str);
		}catch(Exception ex){
			System.out.println("处理异常");
		}
	}
	
	public void print(String str) throws Exception{//表示这个函数可能要抛出异常给客户端
		try{
			int intValue = Integer.parseInt(str);
			int result = intValue * intValue;
			System.out.println("平方是:" + result);
		}
		catch(Exception ex){
			throw ex;	//将ex抛给客户端
		}

	}
	
	
	
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

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

	}



}