Change the sizes of all the passed buttons to be the size of the largest one. : SwingUtilities « Swing « Java Tutorial

 * Copyright (C) 2001-2004 Colin Bell
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * Lesser General Public License for more details.
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.FontMetrics;
import java.awt.Frame;
import java.awt.GraphicsConfiguration;
import java.awt.GraphicsDevice;
import java.awt.GraphicsEnvironment;
import java.awt.Insets;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.Toolkit;
import java.awt.Window;
import java.awt.geom.Rectangle2D;
import java.beans.PropertyVetoException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JInternalFrame;
import javax.swing.SwingUtilities;

 * Common GUI utilities accessed via static methods.
 * @author <A HREF="">Colin Bell</A>
public class GUIUtils {

   * Change the sizes of all the passed buttons to be the size of the largest
   * one.
   * @param btns
   *          Array of buttons to eb resized.
   * @throws IllegalArgumentException
   *           If <TT>btns</TT> is <TT>null</TT>.
  public static void setJButtonSizesTheSame(JButton[] btns) {
    if (btns == null) {
      throw new IllegalArgumentException("null JButton[] passed");

    // Get the largest width and height
    final Dimension maxSize = new Dimension(0, 0);
    for (int i = 0; i < btns.length; ++i) {
      final JButton btn = btns[i];
      final FontMetrics fm = btn.getFontMetrics(btn.getFont());
      Rectangle2D bounds = fm.getStringBounds(btn.getText(), btn.getGraphics());
      int boundsHeight = (int) bounds.getHeight();
      int boundsWidth = (int) bounds.getWidth();
      maxSize.width = boundsWidth > maxSize.width ? boundsWidth : maxSize.width;
      maxSize.height = boundsHeight > maxSize.height ? boundsHeight : maxSize.height;

    Insets insets = btns[0].getInsets();
    maxSize.width += insets.left + insets.right;
    maxSize.height += + insets.bottom;

    for (int i = 0; i < btns.length; ++i) {
      JButton btn = btns[i];

14.127.1.Getting the JFrame of a Component
14.127.2.Convert a coordinate relative to a component's bounds to screen coordinates
14.127.3.Convert a coordinate on a screen to a coordinate relative to a component's bounds
14.127.4.Handle long-running tasks in a Swing application
14.127.5.Get the JFrame by getting the root of a component
14.127.6.Positions the specified frame at a relative position in the screen, where 50% is considered to be the center of the screen.
14.127.7.Positions the specified frame in the middle of the screen.
14.127.8.Positions the specified frame at a random location on the screen while ensuring that the
14.127.9.Get Window from a component
14.127.10.Center that window on the given desktop.
14.127.11.Get All Components in a container
14.127.12.Get Point For Centering
14.127.13.Is Within Parent
14.127.14.Show the given frame as modal to the specified owner
14.127.15.Change the sizes of all the passed buttons to be the size of the largest one.
14.127.16.Get Screen Bounds For
14.127.17.Returns the offset of the bracket matching the one at the specified offset of the document