这是java 2应用开发指南这本书上所有例子的源代码

				import java.awt.*;
				import java.awt.event.*;
				import javax.swing.*;
				 public class copy extends JFrame {
				   public copy (){
				     super( "copy  area " );
				     setSize( 280, 235 );
				     setVisible( true );
				   }
				   public void paint( Graphics g ){
				      super.paint(g);
				      g.setColor( Color.magenta );
				      g.drawOval( 110, 110, 50, 50 );
				      g.copyArea(110,110,60,60,70,0);
				      g.copyArea(110,110,60,60,-70,0);
				      g.copyArea(110,110,60,60,0,-70);
				      g.copyArea(110,110,60,60,0,70);
				 }
				  public static void main( String args[] ){
				    copy app = new copy ();
				    appDefaultCloseOperation(JFrame.EXIT_ON_CLOSE );
				  }
				}