Want to protect your cyber security and still get fast solutions? Ask a secure question today.Go Premium

x
  • Status: Solved
  • Priority: Medium
  • Security: Public
  • Views: 645
  • Last Modified:

trying to change the background color of a JPanel but it has no effect

any ideas why i can set the back ground color for a frame but not for an individual panel? setting the panel color inside its constructor has no effect...

i can change the color of the frame but not the panel itself...
0
wrynn
Asked:
wrynn
2 Solutions
 
for_yanCommented:
I don't think JPanel has a constructor with the specified Color
0
 
for_yanCommented:
If you first create JPanel and then setBackground like

JPanel p = new JPanel();
p.setBackground(Color.RED);

I think this should work; did you try it this way?
0
 
CEHJCommented:
Make sure you call setOpaque(true) on it
0
Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
wrynnAuthor Commented:
ya i've already tried both of those..
0
 
for_yanCommented:
This simple code (see below) runs for me and shows whatever
color I set to JPanel.
Please, run this one - I'm sure it will run for you.
If it runs then post your code which does not show color to you.

import javax.swing.*;
import java.awt.*;

public class JPanelColor extends JFrame {
    JPanel p;

    public JPanelColor(){
        p = new JPanel();
        p.setBackground(Color.BLUE);
        this.getContentPane().add(p);
        this.setSize(100,100);
        this.show();
    }

    public static void main(String [] args){
        new JPanelColor();
    }

}

0
 
objectsCommented:
you will need to also set the background colour of any non transparent components you add to the panel as they are painted over the panel
or if you are not adding any to it make sure the layout manager you are using actually gives the panel the size that you expect.
0
 
wrynnAuthor Commented:
I figured it out.  The problem was that I was using the repaint() method inside of my panel to draw on the panel using a double buffer graphics object and that was overriding my call to setBackground with its own background.
0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Tackle projects and never again get stuck behind a technical roadblock.
Join Now