MIDlet畫圖程序

下面是在MIDlet中畫圖的一個例子，用到了幾個方法，如drawLine,setColor,drawRect,drawRoundRect,fillRect，其中drawRoundRect的後兩個參數分別表示要畫矩形的園角的橫向和縱向直徑：

import Javax.microedition.lcdui.*;
import Javax.microedition.midlet.*;
public class GraphicsMidlet extends MIDlet
{
 Display dis;
 MyCanvas c;
 public GraphicsMidlet()
 {
  dis = Display.getDisplay(this);
  c = new MyCanvas();
  dis.setCurrent(c);
 }
 public void startApp()
 {
 }
 public void pauseApp()
 {
 }
 public void destroyApp(boolean unconditional)
 {
 }
}
class MyCanvas extends Canvas
{
 public void paint(Graphics g)
 {
  int h = this.getHeight();
  int w = this.getWidth();
  g.setColor(255,255,255);
  g.fillRect(0,0,w,h);
  g.setColor(255,0,255);
  g.drawLine(0,0,w,h);
  g.setColor(0,255,255);
  g.drawLine(0,h,w,0);
  g.setColor(0,0,0);
  g.drawRoundRect(w/2 - 20,h/2 -20,40,40,20,20);
  
 }
}