Layout is leaving some pixels on the right

[Francisco A Guimaraes]

Hi everybody, I'm having a problem with drawing a "window" inside a JPanel.

This "window" will have a header and a body. The problem is that on the header, there is a space of a couple pixels unused so the header doesn't stay aligned with the body. The header is a JPanel with GridLayout, the "window" uses a BorderLayout and the frame uses a null layout. Below is the test code I wrote.If you run it, you'll see that there's a minimal yellow line after the magenta border, that's the background color, so the panel isn't using all the space. Can anyone help on this?

Francisco

import java.awt.BorderLayout;
import java.awt.Color;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridLayout;
 
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
 
public class Test {

public static void main(String[] args) {
    JFrame frame = new JFrame();
    Container content = frame.getContentPane();
    content.setLayout(null);
    
    JPanel window = new JPanel(new BorderLayout(0,0));
    window.setSize(400,200);
    window.setOpaque(true);
    window.setBackground(Color.WHITE);
        JPanel header = new JPanel(new GridLayout(1,3,0,0));
        header.setBorder(BorderFactory.createLineBorder(Color.RED));
    header.setOpaque(true);
    header.setBackground(Color.YELLOW);
    JPanel panel = new JPanel(new BorderLayout(0,0));
    panel.setBorder(BorderFactory.createLineBorder(Color.MAGENTA));
    panel.add(createLabel("east", Color.CYAN), BorderLayout.CENTER);
    JPanel separator = new JPanel();
    separator.setBackground(Color.BLACK);
    separator.setPreferredSize(new Dimension(1,0));
    panel.add(separator, BorderLayout.EAST);
    header.add(createLabel("west", Color.ORANGE));
    header.add(createLabel("center", Color.GRAY));
    header.add(panel);
    window.add(header, BorderLayout.NORTH);
    content.add(window);
    frame.setBounds(0,0,600, 300);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.show();
}
 
    private static JLabel createLabel(String text, Color color) {
        JLabel label = new JLabel(text);
        label.setOpaque(true);
        label.setBackground(color);
        return label;
    }
}

[ October 14, 2004: Message edited by: Francisco A Guimaraes ]