Re: Wrap FlowLayout

Knute Johnson <>
Thu, 01 May 2008 09:20:50 -0700
Jason Cavett wrote:

I'm using a FlowLayout in a JFrame. However, when a user resizes the
JFrame, the components (JCheckBoxes) do not wrap. Instead, they just
disappear completely. Is it possible to have FlowLayout wrap? If so,
what am I doing wrong?

Here is the setup of the JPanel (which is inside my JFrame).

FlowLayout flowLayout = new FlowLayout();
southPropertiesPanel = new JPanel();
southPropertiesPanel.add(getFirstPropertyCheckBox(), null);
southPropertiesPanel.add(getSecondPropertyCheckBox(), null);
southPropertiesPanel.add(getThirdPropertyCheckBox(), null);
southPropertiesPanel.add(getFourthPropertyCheckBox(), null);

You must have the size of the JPanel constrained somehow so that you
can't see the rest of the components. Just out of curiosity what is the
null constraint for in the add?

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

public class test {
     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame();
                 JPanel p = new JPanel(new FlowLayout());

                 JButton b;
                 for (int i=0; i<10; i++) {
                     b = new JButton(Integer.toString(i));


Knute Johnson
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