paintComponent() problem

[miguel lisboa]

I wrote code for a paintComponent(Graphics g) and this code paints a gradient on a jPanel background;

Using eclipse, i've several panels (each inside a JTabbedPane) and this makes no one show the expected background.
i tried a variety of opaque and non opaque combinations involving JTabbedPane, contentPane and Panels, but without any effect...

Where should i put my method?
How can i have all jPanels have that gradient effect?

TiA

[Craig Wood]

import java.awt.*;
import java.util.Random;
import javax.swing.*;
 
public class GradientTest
{
    Random seed;
 
    public GradientTest()
    {
        seed = new Random();
        JTabbedPane tabbedPane = new JTabbedPane();
        for(int j = 0; j < 3; j++)
            tabbedPane.addTab("tab " + (j+1), getPanel());
        JFrame f = new JFrame();
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.getContentPane().add(tabbedPane);
        f.setSize(400,400);
        f.setLocation(200,200);
        f.setVisible(true);
    }
 
    private JPanel getPanel()
    {
        JPanel panel = new JPanel()
        {
            GradientPaint gp;
 
            protected void paintComponent(Graphics g)
            {
                super.paintComponent(g);
                Graphics2D g2 = (Graphics2D)g;
                int w = getWidth();
                int h = getHeight();
                if(gp == null)
                    gp = new GradientPaint(0, 0, getColor(),
                                           w, h, getColor());
                g2.setPaint(gp);
                g2.fillRect(0, 0, w, h);
            }
        };
        return panel;
    }
 
    private Color getColor()
    {
        return new Color(seed.nextInt(0xffffff));
    }
 
    public static void main(String[] args)
    {
        new GradientTest();
    }
}

[miguel lisboa]

thaks a lot Craig, that really worked!

implementing the refered method as an anonimous inner class and add it a call to super