Re: How to align swing buttons vertically ?

Knute Johnson <>
Sun, 13 Nov 2011 11:01:24 -0800
On 11/13/2011 9:28 AM, Olivier Scalbert wrote:

On 11/13/2011 03:38 PM, Martin Gregorie wrote:

That's nothing to do with the layout. It aligns the objects you're laying
out by doing its best with the sizes of the objects you created.

JButton inherits size setting methods (setMaximumSize, setMinimumSize,
setPreferredSize) from JComponent. Use them to control button size.

Perhaps I have not understand, but with the following code, buttons are
not well aligned:

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

public class TestViewer {

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame frame = new ViewerFrame();
                 frame.setSize(800, 600);

class ViewerFrame extends JFrame {

     public ViewerFrame() {
         getContentPane().add(new JPanel(), BorderLayout.CENTER);
         getContentPane().add(createBtnPanel(), BorderLayout.EAST);

     private JPanel createBtnPanel() {
         JPanel btnPanel = new JPanel();

         btnPanel.setLayout(new BoxLayout(btnPanel, BoxLayout.Y_AXIS));

         btnPanel.add(new JButton("Button 1"));
         btnPanel.add(new JButton("Button 2"));
         btnPanel.add(new JButton("Long Button 3"));
         btnPanel.add(new JButton("Button 4"));
         btnPanel.add(new JButton("Button 5"));

         return btnPanel;


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

public class test extends JPanel {
     public test() {
         super(new GridBagLayout());

         GridBagConstraints c = new GridBagConstraints();
         c.fill = GridBagConstraints.HORIZONTAL;
         c.gridy = 0;

         String labels[] = {"Button 1","Button 2",
          "Long Button 3","Button 4","Button 5"};

         for (int i=0; i<labels.length; i++) {
             add(new JButton(labels[i]),c);

     public static void main(String[] args) {
         EventQueue.invokeLater(new Runnable() {
             public void run() {
                 JFrame f = new JFrame();
                 f.add(new test(),BorderLayout.EAST);


Knute Johnson

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