Stop Watch Using Java Swing

 Instagram ID - Sritika Manjrekar

Main.java File

public class Main {

public static void main(String[] args) {

// TODO Auto-generated method stub

Stopwatch stopwatch=new Stopwatch();

}

}

Stopwatch.java File

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Stopwatch implements ActionListener {

JFrame frame = new JFrame();

JButton startButton = new JButton("START");

JButton resetButton = new JButton("RESET");

JLabel timeLabel = new JLabel();

int elapsedTime = 0;

int seconds = 0;

int minutes = 0;

int hours = 0;

boolean started = false;

// hold values

String seconds_string = String.format("%02d", seconds);

String minutes_string = String.format("%02d", minutes);

String hours_string = String.format("%02d", hours);

// every one second 1000

Timer timer = new Timer(1000, new ActionListener() {

public void actionPerformed(ActionEvent e) {

elapsedTime = elapsedTime + 1000;

hours = (elapsedTime / 3600000);

minutes = (elapsedTime / 60000) % 60;

seconds = (elapsedTime / 1000) % 60;

seconds_string = String.format("%02d", seconds);

minutes_string = String.format("%02d", minutes);

hours_string = String.format("%02d", hours);

timeLabel.setText(hours_string + ":" + minutes_string + ":" + seconds_string);

}

});

Stopwatch() {

timeLabel.setText(hours_string + ":" + minutes_string + ":" + seconds_string);

timeLabel.setBounds(100, 100, 200, 100);

timeLabel.setFont(new Font("Verdana", Font.PLAIN, 35));

timeLabel.setBorder(BorderFactory.createBevelBorder(1));

timeLabel.setOpaque(true);

timeLabel.setHorizontalAlignment(JTextField.CENTER);

startButton.setBounds(100, 220, 100, 50);

startButton.setFont(new Font("Ink Free", Font.PLAIN, 20));

startButton.setFocusable(false);

startButton.addActionListener(this);

resetButton.setBounds(210, 220, 100, 50);

resetButton.setFont(new Font("Ink Free", Font.PLAIN, 20));

resetButton.setFocusable(false);

resetButton.addActionListener(this);

frame.add(startButton);

frame.add(resetButton);

frame.add(timeLabel);

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(420, 420);

frame.setLayout(null);

frame.setVisible(true);

}

void start() {

timer.start();

}

void stop() {

timer.stop();

}

void reset() {

timer.stop();

elapsedTime=0;

seconds=0;

minutes=0;

hours=0;

seconds_string = String.format("%02d", seconds);

minutes_string = String.format("%02d", minutes);

hours_string = String.format("%02d", hours);

timeLabel.setText(hours_string + ":" + minutes_string + ":" + seconds_string);

}

@Override

public void actionPerformed(ActionEvent e) {

if(e.getSource()==startButton) {

 

if(started==false) {

started=true;

startButton.setText("STOP");

start();

}else {

started=false;

startButton.setText("START");

stop();

}

}

if(e.getSource()==resetButton) {

started=false;

startButton.setText("START");

reset();

}

}

}