the first helloworld with j2me

最新推荐文章于 2016-04-09 20:02:00 发布

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本文提供了一个简单的Java MIDP (Mobile Information Device Profile) 应用示例——HelloWorld程序。该程序通过实现CommandListener接口响应退出命令，并展示了如何创建显示'Hello World!'的基本界面。

import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Displayable;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;
import javax.microedition.lcdui.Form;

public class HelloWorld extends MIDlet implements CommandListener {

private Display display;
private Form form;
private Command command;

public HelloWorld() {
  super();
  // TODO Auto-generated constructor stub
  form = new Form("test");
  form.append("Hello World !");
  command = new Command("Exit",Command.EXIT,1);
  form.addCommand(command);
  form.setCommandListener(this);

}

protected void startApp() throws MIDletStateChangeException {
  // TODO Auto-generated method stub
  display = Display.getDisplay(this);
  display.setCurrent(form);
}

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

}

protected void destroyApp(boolean arg0) {
// TODO Auto-generated method stub
form = null;
}

public void commandAction(Command arg0, Displayable arg1) {
  // TODO Auto-generated method stub
  if(arg0 == command){
   destroyApp(true);
   notifyDestroyed();
  }

}