AboutDialog.java Source code

Introduction

Here is the source code for AboutDialog.java

Source

import java.awt.Dimension;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;

import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JMenu;
import javax.swing.JMenuBar;
import javax.swing.JMenuItem;

class AboutDialog extends JDialog {
    public AboutDialog() {
        setTitle("About");
        setLayout(new BoxLayout(getContentPane(), BoxLayout.Y_AXIS));

        add(Box.createRigidArea(new Dimension(0, 10)));

        JLabel name = new JLabel("Notes");
        name.setAlignmentX(0.5f);
        add(name);

        add(Box.createRigidArea(new Dimension(0, 100)));

        JButton close = new JButton("Close");
        close.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                dispose();
            }
        });

        close.setAlignmentX(0.5f);
        add(close);
        setModalityType(ModalityType.APPLICATION_MODAL);
        setDefaultCloseOperation(DISPOSE_ON_CLOSE);
        setSize(300, 200);
    }
}

public class SimpleDialog {

    public static void main(String[] args) {
        JMenuBar menubar = new JMenuBar();

        JMenu file = new JMenu("File");
        file.setMnemonic(KeyEvent.VK_F);

        JMenu help = new JMenu("Help");
        help.setMnemonic(KeyEvent.VK_H);

        JMenuItem about = new JMenuItem("About");
        help.add(about);

        about.addActionListener(new ActionListener() {
            public void actionPerformed(ActionEvent event) {
                AboutDialog ad = new AboutDialog();
                ad.setVisible(true);
            }
        });

        menubar.add(file);
        menubar.add(help);
        JFrame f = new JFrame();
        f.setJMenuBar(menubar);

        f.setSize(300, 200);
        f.setLocationRelativeTo(null);
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        f.setVisible(true);
    }
}