TimerDemo.java - Exploiting Anomalies

/*==================================================================================================
  --------------------------------------------------------------------------------------------------
  [TimerDemo.java]
  Exploiting anomalies:
  The code implemented here is proof that no two programmers think alike.

  It is coding convention to have an exception report an error (or anomaly, to be more precise), and
  have you program take relative actions.

  This piece of code is written to reverse the aforementioned-trait however (portray the exception
  as 'normal' operations), and (the catch block) is used to do the 'contemporary' work.

        (c) Damion 'Phr0z3n.dev' Tapper, 2015.
        Email: [email protected]
        Website: http://L337Stuff.Blogspot.com
  --------------------------------------------------------------------------------------------------
  ==================================================================================================*/
import javax.swing.Timer;
import javax.swing.JFrame;
import javax.swing.JButton;
import javax.swing.JMenuBar;
import javax.swing.JMenu;
import javax.swing.JMenuItem;
import java.awt.event.WindowEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

public class TimerDemo extends JFrame implements ActionListener
{
    public static void main(String arg[])
    {
        new TimerDemo();
    }

    public TimerDemo()
    {
        this.addWindowListener(new WinAdapt());

        new Timer(1000 * 1, this).start(); // constructs a timer to pulse at 1 second intervals, and to report the timer pulses to the ActionListener

        buildMenu();
        buildFrame();
        this.setLocation(250, 150);
        this.setVisible(true);
    }

    private void buildFrame() // for aesthetics
    {
        JButton exitButton = new JButton("Exit");

        exitButton.addActionListener(this);

        this.add(exitButton);
        this.setSize(300, 200);

    }

    private void buildMenu()
    {
        JMenuBar    menuBar = new JMenuBar();
        JMenu       fileMenu = new JMenu("File");

        menuBar.add(fileMenu);


        JMenuItem   exitMenuItem = new JMenuItem("Exit");

        exitMenuItem.addActionListener(this);

        fileMenu.add(exitMenuItem);
        this.setJMenuBar(menuBar);
    }

    @Override
    public void actionPerformed(ActionEvent e) // called with each expiration of the timer
    {
        try
        {
            /**
             * NOTE:
             * The command string is null if no user input is done (one was not set).
             *
             * This is the magic bullet that triggers the exception (no pun intended).
             */
            switch(e.getActionCommand())
            {
                case "Exit":
                    System.exit(0);
                    break;
            }
        }
        catch(NullPointerException ex) // a NullPointerException is thrown if 'switch' tries to operate on a null string...
        {
            /**
             * ...and when an exception should be a 'negative thing'...
             */

            System.out.println("Timer fired!"); // I did this cause I can, Yes I did! Yes I did!
        }
    }
}

class WinAdapt extends WindowAdapter
{
    @Override
    public void windowClosing(WindowEvent e)
    {
        super.windowClosing(e);

            if(e.getID() == WindowEvent.WINDOW_CLOSING)
                System.exit(0);
    }
}