J2me 2D-添加文本例子

import javax.microedition.lcdui.Canvas;   
import javax.microedition.lcdui.Command;   
import javax.microedition.lcdui.CommandListener;   
import javax.microedition.lcdui.Display;   
import javax.microedition.lcdui.Displayable;   
import javax.microedition.lcdui.Font;   
import javax.microedition.lcdui.Graphics;   
import javax.microedition.midlet.MIDlet;   
  
public class TextExampleMIDlet extends MIDlet {   
  private Display display;   
  
  private MyCanvas canvas;   
  
  public TextExampleMIDlet() {   
    display = Display.getDisplay(this);   
    canvas = new MyCanvas(this);   
  }   
  
  protected void startApp() {   
    display.setCurrent(canvas);   
  }   
  
  protected void pauseApp() {   
  }   
  
  protected void destroyApp(boolean unconditional) {   
  }   
  
  public void exitMIDlet() {   
    destroyApp(true);   
    notifyDestroyed();   
  }   
}   
  
class MyCanvas extends Canvas implements CommandListener {   
  private Command exit;   
  
  private TextExampleMIDlet textExample;   
  
  public MyCanvas(TextExampleMIDlet textExample) {   
    this.textExample = textExample;   
    exit = new Command("Exit", Command.EXIT, 1);   
    addCommand(exit);   
    setCommandListener(this);   
  }   
  
  protected void paint(Graphics graphics) {   
    graphics.setColor(255, 255, 255);   
    graphics.fillRect(0, 0, getWidth(), getHeight());   
    graphics.setColor(255, 0, 0);   
    graphics.setFont(Font.getFont(Font.FACE_PROPORTIONAL, Font.STYLE_BOLD, Font.SIZE_SMALL));   
    graphics.drawString("Profound statement.", 50, 10, Graphics.HCENTER | Graphics.BASELINE);   
  }   
  
  public void commandAction(Command command, Displayable displayable) {   
    if (command == exit) {   
      textExample.exitMIDlet();   
    }   
  }   
}