Here you can find the source of createButton(Action action)
public static JButton createButton(Action action)
//package com.java2s; /*//from ww w. j a v a 2 s.co m * Copyright (c) 2000, 2008, Oracle and/or its affiliates. All rights reserved. * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. * * This code is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 only, as * published by the Free Software Foundation. * * This code is distributed in the hope that it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License * version 2 for more details (a copy is included in the LICENSE file that * accompanied this code). * * You should have received a copy of the GNU General Public License version * 2 along with this work; if not, write to the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. * * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA * or visit www.oracle.com if you need additional information or have any * questions. * */ import java.awt.*; import java.awt.event.ActionListener; import javax.swing.*; public class Main { public static Dimension buttonPrefSize = new Dimension(100, 26); public static JButton createButton(Action action) { JButton button = new JButton(action); setButtonSize(button, buttonPrefSize); return button; } public static JButton createButton(String text, ActionListener listener, int mnemonic) { JButton button = new JButton(text); if (listener != null) button.addActionListener(listener); if (mnemonic != -1) button.setMnemonic(mnemonic); setButtonSize(button, buttonPrefSize); return button; } public static JButton createButton(String text, ActionListener listener) { return createButton(text, listener, -1); } private static void setButtonSize(JButton button, Dimension size) { String text = button.getText(); button.setMinimumSize(size); if (text.length() == 0) { button.setPreferredSize(size); } else { Dimension psize = button.getPreferredSize(); if (psize.width < size.width) button.setPreferredSize(size); } } }