Name: chT40241 Date: 06/12/98


The bug is that the background of the Button created looks gray, but it's really inheriting white from the Frame it is contained in. When the background color is queried from the Button it returns white, but it should return lightgray. This is confusing since the button background color shows up as white (actually it's the WINDOW SystemColor, which is white on my machine) in the property sheet but is gray in the button.

Here's the output of the program :

Button background color is of type : java.awt.Color
Button background color is : java.awt.Color[r=255,g=255,b=255]
Button background color RGB is : -1
Button background color is of type : java.awt.Color
Button background color is : java.awt.Color[r=255,g=255,b=255]
Button background color RGB is : -1

Here is the code:

import java.awt.Button;
import java.awt.FlowLayout;
import java.awt.Frame;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class Bug {
   public static void main( String[] args ) {
      Frame frame = new Frame();
      frame.setLayout( new FlowLayout() );

      Button button =
        new Button( "Press me to find out my background color" );
      button.addActionListener( new ActionHandler( button ) );
      frame.add( button );

      frame.pack();
      frame.setVisible(true);
   }
}

class ActionHandler implements ActionListener
{
   Button button;

   public ActionHandler( Button button ) {
      this.button = button;
   }

   public void actionPerformed( ActionEvent event ) {
      System.out.println( "Button background color is of type : :"
                + button.getBackground().getClass().getName() );
      System.out.println( "Button background color is : " +
                button.getBackground() );
      System.out.println( "Button background color RGB is : " +
                button.getBackground().getRGB() );
   }
}

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