custompanel.java

Java语言

// A customized JPanel class.
import java.awt.*;
import javax.swing.*;

public class CustomPanel extends JPanel {
   public final static int CIRCLE = 1, SQUARE = 2;
   private int shape;

   public void paintComponent( Graphics g )
   {
      super.paintComponent( g );

      if ( shape == CIRCLE )
         g.fillOval( 50, 10, 60, 60 );
      else if ( shape == SQUARE )
         g.fillRect( 50, 10, 60, 60 );
   }

   public void draw( int s )
   {
      shape = s;
      repaint();
   }
}