hellomidlet.java

用Java/C#开发手机程序及移动应用光盘代码。J2ME核心类及MIDlet类；基于Java开发MIDlet程序；图形处理及低级事件处理；多线程编程；即时消息传送；I/O及网络编程；数据库编程；多媒体

//HelloMIDlet.java
import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;
import org.spruce.midp.SpruceFloat;

public class HelloMIDlet extends MIDlet implements CommandListener
{
	private Command exitCommand;
	private Display display;
	SpruceFloat a = new SpruceFloat("3.14");
	public HelloMIDlet()
	{
		display = Display.getDisplay(this);
		exitCommand = new Command("Exit", Command.SCREEN, 2);
	}
	public void startApp()
	{
		TextBox t = new TextBox("Hello MIDlet", "Mobile世界你好", 256, 0);
		t.addCommand(exitCommand);
		t.setCommandListener(this);
		display.setCurrent(t);
	}
	public void pauseApp()
	{ }
	public void destroyApp(boolean unconditional)
	{ }
	public void commandAction(Command c, Displayable s)
	{
		if (c == exitCommand)
		{
			destroyApp(false);
			notifyDestroyed();
		}
	}
}