By Alvin Alexander. Last updated: June 6, 2016
The following source code comes from Sun Microsystems, and shows various things related to showing and clicking a JButton
, including using the JButton
class, ActionListener
, ActionEvent
, setMnemonic
, and actionPerformed
.
jbutton, actionperformed, actionlistener, actionevent, setmnemonic, java, swing, jframe, jpanel
/** * Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * -Redistribution of source code must retain the above copyright notice, this * list of conditions and the following disclaimer. * * -Redistribution in binary form must reproduce the above copyright notice, * this list of conditions and the following disclaimer in the documentation * and/or other materials provided with the distribution. * * Neither the name of Sun Microsystems, Inc. or the names of contributors may * be used to endorse or promote products derived from this software without * specific prior written permission. * * This software is provided "AS IS," without a warranty of any kind. ALL * EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES, INCLUDING * ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE * OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN MIDROSYSTEMS, INC. ("SUN") * AND ITS LICENSORS SHALL NOT BE LIABLE FOR ANY DAMAGES SUFFERED BY LICENSEE * AS A RESULT OF USING, MODIFYING OR DISTRIBUTING THIS SOFTWARE OR ITS * DERIVATIVES. IN NO EVENT WILL SUN OR ITS LICENSORS BE LIABLE FOR ANY LOST * REVENUE, PROFIT OR DATA, OR FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, * INCIDENTAL OR PUNITIVE DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY * OF LIABILITY, ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, * EVEN IF SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. * * You acknowledge that this software is not designed, licensed or intended * for use in the design, construction, operation or maintenance of any * nuclear facility. */ // v 1.3 import java.awt.BorderLayout; import java.awt.Component; import java.awt.GridLayout; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyEvent; import javax.swing.BorderFactory; import javax.swing.JButton; import javax.swing.JFrame; import javax.swing.JLabel; import javax.swing.JPanel; import javax.swing.UIManager; public class SwingApplication { private static String labelPrefix = "Number of button clicks: "; private int numClicks = 0; public Component createComponents() { final JLabel label = new JLabel(labelPrefix + "0 "); JButton button = new JButton("I'm a Swing button!"); button.setMnemonic(KeyEvent.VK_I); button.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { numClicks++; label.setText(labelPrefix + numClicks); } }); label.setLabelFor(button); /** * An easy way to put space between a top-level container and its * contents is to put the contents in a JPanel that has an "empty" * border. */ JPanel pane = new JPanel(); pane.setBorder(BorderFactory.createEmptyBorder(30, //top 30, //left 10, //bottom 30) //right ); pane.setLayout(new GridLayout(0, 1)); pane.add(button); pane.add(label); return pane; } public static void main(String[] args) { try { UIManager.setLookAndFeel(UIManager .getCrossPlatformLookAndFeelClassName()); } catch (Exception e) { } //Create the top-level container and add contents to it. JFrame frame = new JFrame("SwingApplication"); SwingApplication app = new SwingApplication(); Component contents = app.createComponents(); frame.getContentPane().add(contents, BorderLayout.CENTER); frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.pack(); frame.setVisible(true); } }