JAVA - Button

 

import javax.swing.AbstractButton;

import javax.swing.JButton;

import javax.swing.JPanel;

import javax.swing.JFrame;

import javax.swing.ImageIcon;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.awt.event.KeyEvent;

/* 

 * ButtonDemo.java requires the following files:

 *   images/right.gif

 *   images/middle.gif

 *   images/left.gif

 */

public class ButtonDemo extends JPanel

                        implements ActionListener {

    protected JButton b1, b2, b3;

    public ButtonDemo() {

        ImageIcon leftButtonIcon = createImageIcon("new.gif");

        ImageIcon middleButtonIcon = createImageIcon("run.png");

        ImageIcon rightButtonIcon = createImageIcon("save.png");

        b1 = new JButton("Disable middle button", leftButtonIcon);

        b1.setVerticalTextPosition(AbstractButton.CENTER);

        b1.setHorizontalTextPosition(AbstractButton.LEADING); //aka LEFT, for left-to-right locales

        b1.setMnemonic(KeyEvent.VK_D);

        b1.setActionCommand("disable");

        b2 = new JButton("Middle button", middleButtonIcon);

        b2.setVerticalTextPosition(AbstractButton.BOTTOM);

        b2.setHorizontalTextPosition(AbstractButton.CENTER);

        b2.setMnemonic(KeyEvent.VK_M);

        b3 = new JButton("Enable middle button", rightButtonIcon);

        //Use the default text position of CENTER, TRAILING (RIGHT).

        b3.setMnemonic(KeyEvent.VK_E);

        b3.setActionCommand("enable");

        b3.setEnabled(false);

        //Listen for actions on buttons 1 and 3.

        b1.addActionListener(this);

        b3.addActionListener(this);

        b1.setToolTipText("Click this button to disable the middle button.");

        b2.setToolTipText("This middle button does nothing when you click it.");

        b3.setToolTipText("Click this button to enable the middle button.");

        //Add Components to this container, using the default FlowLayout.

        add(b1);

        add(b2);

        add(b3);

    }

    public void actionPerformed(ActionEvent e) {

        if ("disable".equals(e.getActionCommand())) {

            b2.setEnabled(false);

            b1.setEnabled(false);

            b3.setEnabled(true);

        } else {

            b2.setEnabled(true);

            b1.setEnabled(true);

            b3.setEnabled(false);

        }

    }

    /** Returns an ImageIcon, or null if the path was invalid. */

    protected static ImageIcon createImageIcon(String path) {

        java.net.URL imgURL = ButtonDemo.class.getResource(path);

        if (imgURL != null) {

            return new ImageIcon(imgURL);

        } else {

            System.err.println("Couldn't find file: " + path);

            return null;

        }

    }

    /**

     * Create the GUI and show it.  For thread safety, 

     * this method should be invoked from the 

     * event-dispatching thread.

     */

    private static void createAndShowGUI() {

        //Create and set up the window.

        JFrame frame = new JFrame("ButtonDemo");

        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.

        ButtonDemo newContentPane = new ButtonDemo();

        newContentPane.setOpaque(true); //content panes must be opaque

        frame.setContentPane(newContentPane);

        //Display the window.

        frame.pack();

        frame.setVisible(true);

    }

    public static void main(String[] args) {

        //Schedule a job for the event-dispatching thread:

        //creating and showing this application's GUI.

        javax.swing.SwingUtilities.invokeLater(new Runnable() {

            public void run() {

                createAndShowGUI(); 

            }

        });

    }

}