gamescreen.java

手机Java开发教材的源代码：1.商用建构流程(WTK104)

import javax.microedition.lcdui.* ;
public class GameScreen extends Canvas implements CommandListener
{
	private static Displayable instance ;
	synchronized public static Displayable getInstance()
	{
		if(instance == null)
			instance = new GameScreen() ;
		return instance ;
	}
	
	private GameScreen()
	{
		addCommand(new Command("辅助说明",Command.HELP,1)) ;
		addCommand(new Command("返回",Command.BACK,1)) ;
		setCommandListener(this) ;
	}
	public void commandAction(Command c,Displayable s)
	{
		Navigator.flow(c.getLabel()) ;
	}
	public void paint(Graphics g)
	{
		g.setColor(125,125,125) ;
		g.fillRect(0,0,getWidth(),getHeight()) ;
		g.setColor(0,0,0) ;
		g.drawRect(10,10,60,70) ;
	}
}