Re: BoxLayout annoyance

Knute Johnson <>
Sun, 17 Aug 2008 20:51:59 -0700
Kenneth P. Turvey wrote:

Why would this line give me an error about sharing the box layout. I
can't possibly be saving it. I don't even have a reference to it.

frame.setLayout(new BoxLayout(frame, BoxLayout.PAGE_AXIS));

I've run into this before and I can't seem to remember what the solution



Apparently you have to pass the content pane as the argument to the
BoxLayout constructor. Passing a JFrame doesn't work. The change to
allow adding components to a JFrame directly, while very handy, has a
few gotchas. There was another one of these the other day that drove me
nuts for a while.

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

public class test extends JFrame {
     public static void createGUI() {
         JFrame f = new JFrame();

         Container c = f.getContentPane();
         f.setLayout(new BoxLayout(c,BoxLayout.Y_AXIS));

         JButton b = new JButton("One");

         b = new JButton("Two");


     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {


Knute Johnson
email s/nospam/knute2008/

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