j2me HelloWorld

配置好Eclipse + KTW2.2环境后.实现在手机模拟器上显示HelloWorld字样

import javax.microedition.midlet.*;
import javax.microedition.lcdui.*;

//画布类,它实现了显示手机屏幕的内容
class HelloCanvas extends Canvas
{
 public HelloCanvas()
 {
 }

 public void paint(Graphics g)
 {
  g.setColor(255, 255, 255);
  g.fillRect(0, 0, getWidth(), getHeight());
  g.setColor(0, 0, 0);
  g.drawLine(10,10,50,50);
  g.drawString("Hello World!", 0, 0, Graphics.LEFT | Graphics.TOP);
 }
}

//MIDlet程序入口,显示画布
public class HelloWorld extends MIDlet implements CommandListener
{
 private HelloCanvas canvas_;
 private Display display_;

 public HelloWorld()
 {
  canvas_ = new HelloCanvas();
 }

 public void startApp()
 {
  display_ = Display.getDisplay(this);
  display_.setCurrent(canvas_);
  canvas_.repaint();
 }

 public void pauseApp()
 {
 }

 public void destroyApp(boolean unconditional)
 {
 }

 public void commandAction(Command c, Displayable s)
 {
   }
}

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