Display the Digital clock using Java Swing

     A digital clock is a format of hours, minutes and seconds. To display the digital clock in java, use the ‘Swing’.

Let us implement the digital clock.

Logic:

• A frame is created.
• Basic settings like title, size,layout, label are set.
• The clock format is displayed in the label.

Java implementation:

The built-in packages javax.swing, java.awt, java.text.SimpleDateFormat  and java.util.Date are included.

• Create a public class which extends JFrame.
• A label object is created.
• In the constructor(), add the following.
• setTitle() – it adds the title.
• setSize() – length and breadth are created.
• setDefaultCloseOperation -it makes the window closing method.
• setLayout – it sets the layout.
• Label object is initialised.
• Label font name,size and Boldness are assigned.
• Make the label set in the center of the border layout.
• A timer is set to update the clock.
• Make the visibility to true.
• To update the clock, make the date format as hour,minute and second.
• Make the timer displayed in the label.
• Finally, create the main() function.
• Call the SwingUtilities.invokeLater() function to display the clock.

Program:

// Built –in packages

import javax.swing.*;

import java.awt.*;

import java.text.SimpleDateFormat;

import java.util.Date;

// public class creation

public class DigitalClockEg extends JFrame {

    private JLabel clockLabel1;

//constructor

    public DigitalClockEg() {

// Basic settings are created.       

        setTitle("DigiClock");

        setSize(250, 100);

        setDefaultCloseOperation(EXIT_ON_CLOSE);

        setLayout(new BorderLayout());

        clockLabel1 = new JLabel("", SwingConstants.CENTER);

        clockLabel1.setFont(new Font("Times New Roman", Font.BOLD, 27));

        clockLabel1.setForeground(Color.RED);

        add(clockLabel1, BorderLayout.CENTER);

        new Timer(1000, e -> updateClock()).start();

        setVisible(true);

    }

  //updateClock() function definition

    private void updateClock() {

        String cTime1 = new SimpleDateFormat("HH:mm:ss").format(new Date());

        clockLabel1.setText(cTime1);

    }

//main() function

    public static void main(String[] args) {

        SwingUtilities.invokeLater(DigitalClockEg::new);

    }

}

Output:

Just Compile and run the program to get the output as follows….

C:\raji\blog>javac DigitalClockEg.java

C:\raji\blog>java DigitalClockEg

This is the way of creating a digital Clock in java Swing. Hope, this code is helpful to you. If you have any queries, drop your comments in the comment section. Keep coding!!!