Inner Classes in Java Example Program

Java Inner Class Example Codes

import java.awt.*;

import java.awt.event.*;

import java.util.*;

import javax.swing.*;

import javax.swing.Timer;

/**

* This program demonstrates the use of inner classes.

*/

public class InnerClassTest

{

public static void main(String[] args)

{

TalkingClock clock = new TalkingClock(1000, true);

clock.start();

// keep program running until user selects "Ok"

JOptionPane.showMessageDialog(null, "Quit program?");

System.exit(0);

}

}

/**

* A clock that prints the time in regular intervals.

*/

class TalkingClock

{

/**

* Constructs a talking clock

* @param interval the interval between messages (in milliseconds)

* @param beep true if the clock should beep

*/

public TalkingClock(int interval, boolean beep)

{

this.interval = interval;

this.beep = beep;

}

/**

* Starts the clock.

*/

public void start()

{

ActionListener listener = new TimePrinter();

Timer t = new Timer(interval, listener);

t.start();

}

private int interval;

private boolean beep;

public class TimePrinter implements ActionListener

{

public void actionPerformed(ActionEvent event)

{

Date now = new Date();

System.out.println("At the tone, the time is " + now);

if (beep) Toolkit.getDefaultToolkit().beep();

}

}

}

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