midlet2.java

这是郭克华老师的J2ME视频的源代码

package prj14_1;

import java.util.Random;

import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Display;
import javax.microedition.lcdui.Font;
import javax.microedition.lcdui.Graphics;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MIDlet2 extends MIDlet {
	private NumberCanvas nc = new NumberCanvas();
	private Display dis;
	protected void startApp() throws MIDletStateChangeException {
		dis = Display.getDisplay(this);
		dis.setCurrent(nc);
	}
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

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

	}

	class NumberCanvas extends Canvas implements Runnable{		
		private char rndChar;
		private Random rnd = new Random();
		public NumberCanvas(){
			new Thread(this).start();
		}

		public void paint(Graphics g){
			Font font = Font.getFont(Font.FACE_SYSTEM,Font.STYLE_BOLD,Font.SIZE_LARGE);
			g.setFont(font);
			g.setColor(rnd.nextInt(256),rnd.nextInt(256),rnd.nextInt(256));
			int x = rnd.nextInt(this.getWidth());
			int y = rnd.nextInt(this.getHeight());
			g.drawChar(rndChar, x, y, Graphics.TOP|Graphics.LEFT);
			System.out.println(rndChar);
		}
		public void run(){
			while(true){
				int number = '0' + rnd.nextInt(10);
				//0-9之间的数字，转成字符不是0-9
				rndChar = (char)number;
				repaint();
				try{
					Thread.sleep(100);
				}catch(Exception ex){}
			}
			}
		public void keyPressed(int keyCode){
			//将keyCode和rndChar表示的数字比较，评分
		}
		}
	}