java把图片处理成圆形将任何一张图片处理成圆形的图片。求源JAVA代码？

import java.awt.*;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;


import javax.swing.JFrame;
import javax.swing.JPanel;

class PaintovalPane extends JPanel
{
public void paintComponent(Graphics g)
{
  super.paintComponent(g);
  g.setColor(Color.pink);
  g.fillOval(100, 100, 200, 200);
 
}
}
class PaintovalFrame. extends JFrame
{
public PaintovalFrame()
{
  setTitle("lamp");
  setSize(500,500);
  addWindowListener(
  new WindowAdapter()
  {
   public void WindowClosing(WindowEvent e)
   {
    System.exit(0);
   }
  });
  Container contentPane = getContentPane();
  contentPane.add(new PaintovalPane());
}
}
public class Paintoval {
public static void main(String[] args) {
  JFrame. f = new PaintovalFrame();
  f.show();

}

}