// Fig. 12.6: ShowColors.java
// Demonstrating Colors.
import javax.swing.JFrame;
import java.awt.Graphics;
import java.awt.Color;
import javax.swing.JPanel;

public class ShowColors
{
   // execute application
   public static void main( String[] args )
   {
      // create frame for ColorJPanel
      JFrame frame = new JFrame( "Using colors" );
      frame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );

      ColorJPanel colorJPanel = new ColorJPanel(); // create ColorJPanel
      frame.add( colorJPanel ); // add colorJPanel to frame
      frame.setSize( 400, 180 ); // set frame size
      frame.setVisible( true ); // display frame
   } // end main
} // end class ShowColors

class ColorJPanel extends JPanel 
{
   // draw rectangles and Strings in different colors
   public void paintComponent( Graphics g )
   {
      super.paintComponent( g ); // call superclass's paintComponent

      this.setBackground( Color.WHITE );

      // set new drawing color using integers
      g.setColor( new Color( 255, 0, 0 ) );
      g.fillRect( 15, 25, 100, 20 );
      g.drawString( "Current RGB: " + g.getColor(), 130, 40 );

      // set new drawing color using floats
      g.setColor( new Color( 0.50f, 0.75f, 0.0f ) );
      g.fillRect( 15, 50, 100, 20 );
      g.drawString( "Current RGB: " + g.getColor(), 130, 65 );

      // set new drawing color using static Color objects
      g.setColor( Color.BLUE );
      g.fillRect( 15, 75, 100, 20 );
      g.drawString( "Current RGB: " + g.getColor(), 130, 90 );

      // display individual RGB values
      Color color = Color.MAGENTA;
      g.setColor( color );
      g.fillRect( 15, 100, 100, 20 );
      g.drawString( "RGB values: " + color.getRed() + ", " +
         color.getGreen() + ", " + color.getBlue(), 130, 115 );
   } // end method paintComponent
} // end class ColorJPanel

Results