JAVA中實作透明窗體

package  sample;

import  java.awt. * ;

import  java.awt.Robot;

import  javax.swing. * ;

public   final   class  Test  extends  JApplet  ... {

   JPanel jp;

   Image Background;

   Point p0;

   Point p1;

   public Test() ...{

       jp = new JPanel();

       this.getContentPane().add(jp);

    //擷取整個螢幕圖像

       try ...{

           Robot r = new Robot();

           Toolkit tk =Toolkit.getDefaultToolkit();

           Dimension dm = tk.getScreenSize();

           Background = r.createScreenCapture(new Rectangle(0,0,(int)dm.getWidth(), (int)dm.getHeight()));

       } catch(Exception e) ...{

           e.printStackTrace();

       }

       this.resize(600, 600);

       this.setVisible(true);

   }

   public void paint(Graphics g) ...{

       p0 = this.getLocationOnScreen();

       p1 = new Point(-p0.x, -p0.y);

       g.drawImage(Background, p1.x, p1.y, null);

       repaint();

   }

}