IntroExample.java Source code

Introduction

Here is the source code for IntroExample.java

Source

/*
Java Swing, 2nd Edition
By Marc Loy, Robert Eckstein, Dave Wood, James Elliott, Brian Cole
ISBN: 0-596-00408-7
Publisher: O'Reilly 
*/
// IntroExample.java
// An introduction to building menus and menu items. Accelerators and
// mnemonics are added to various items.
//

import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.ButtonGroup;
import javax.swing.ImageIcon;
import javax.swing.JCheckBoxMenuItem;
import javax.swing.JFrame;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;
import javax.swing.JRadioButtonMenuItem;
import javax.swing.KeyStroke;

public class IntroExample extends JMenuBar {

    String[] fileItems = new String[] { "New", "Open", "Save", "Exit" };

    String[] editItems = new String[] { "Undo", "Cut", "Copy", "Paste" };

    char[] fileShortcuts = { 'N', 'O', 'S', 'X' };

    char[] editShortcuts = { 'Z', 'X', 'C', 'V' };

    public IntroExample() {

        JMenu fileMenu = new JMenu("File");
        JMenu editMenu = new JMenu("Edit");
        JMenu otherMenu = new JMenu("Other");
        JMenu subMenu = new JMenu("SubMenu");
        JMenu subMenu2 = new JMenu("SubMenu2");

        //  Assemble the File menus with mnemonics
        ActionListener printListener = new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                System.out.println("Menu item [" + event.getActionCommand() + "] was pressed.");
            }
        };
        for (int i = 0; i < fileItems.length; i++) {
            JMenuItem item = new JMenuItem(fileItems[i], fileShortcuts[i]);
            item.addActionListener(printListener);
            fileMenu.add(item);
        }

        //  Assemble the File menus with keyboard accelerators
        for (int i = 0; i < editItems.length; i++) {
            JMenuItem item = new JMenuItem(editItems[i]);
            item.setAccelerator(KeyStroke.getKeyStroke(editShortcuts[i],
                    Toolkit.getDefaultToolkit().getMenuShortcutKeyMask(), false));
            item.addActionListener(printListener);
            editMenu.add(item);
        }

        //  Insert a separator in the Edit Menu in Position 1 after "Undo"
        editMenu.insertSeparator(1);

        //  Assemble the submenus of the Other Menu
        JMenuItem item;
        subMenu2.add(item = new JMenuItem("Extra 2"));
        item.addActionListener(printListener);
        subMenu.add(item = new JMenuItem("Extra 1"));
        item.addActionListener(printListener);
        subMenu.add(subMenu2);

        //  Assemble the Other Menu itself
        otherMenu.add(subMenu);
        otherMenu.add(item = new JCheckBoxMenuItem("Check Me"));
        item.addActionListener(printListener);
        otherMenu.addSeparator();
        ButtonGroup buttonGroup = new ButtonGroup();
        otherMenu.add(item = new JRadioButtonMenuItem("Radio 1"));
        item.addActionListener(printListener);
        buttonGroup.add(item);
        otherMenu.add(item = new JRadioButtonMenuItem("Radio 2"));
        item.addActionListener(printListener);
        buttonGroup.add(item);
        otherMenu.addSeparator();
        otherMenu.add(item = new JMenuItem("Potted Plant", new ImageIcon("image.gif")));
        item.addActionListener(printListener);

        //  Finally, add all the menus to the menu bar
        add(fileMenu);
        add(editMenu);
        add(otherMenu);
    }

    public static void main(String s[]) {
        JFrame frame = new JFrame("Simple Menu Example");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setJMenuBar(new IntroExample());
        frame.pack();
        frame.setVisible(true);
    }
}