53 lines
1.2 KiB
Java
53 lines
1.2 KiB
Java
package localInnerClass;
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import java.awt.*;
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import java.awt.event.*;
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import java.time.*;
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import javax.swing.*;
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/**
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* This program demonstrates the use of local inner classes.
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* @version 1.02 2017-12-14
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* @author Cay Horstmann
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*/
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public class LocalInnerClassTest
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{
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public static void main(String[] args)
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{
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var clock = new TalkingClock();
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clock.start(1000, true);
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// keep program running until the user selects "Ok"
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JOptionPane.showMessageDialog(null, "Quit program?");
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System.exit(0);
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}
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}
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/**
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* A clock that prints the time in regular intervals.
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*/
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class TalkingClock
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{
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/**
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* Starts the clock.
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* @param interval the interval between messages (in milliseconds)
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* @param beep true if the clock should beep
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*/
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public void start(int interval, boolean beep)
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{
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class TimePrinter implements ActionListener
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{
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public void actionPerformed(ActionEvent event)
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{
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System.out.println("At the tone, the time is "
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+ Instant.ofEpochMilli(event.getWhen()));
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if (beep) Toolkit.getDefaultToolkit().beep();
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}
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}
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var listener = new TimePrinter();
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var timer = new Timer(interval, listener);
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timer.start();
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}
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}
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