Stopwatch

import java.awt.event.ActionListener;
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;
    String seconds_string = String.format("%02d",seconds);
    String minutes_string = String.format("%02d",minutes);
    String hours_string = String.format("%02d",hours);

    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(100,200,100,50);
        startButton.setFont(new Font("Ink Free",Font.PLAIN,20));
        startButton.setFocusable(false);
        startButton.addActionListener(this);

        resetButton.setBounds(200,200,100,50);
        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(450,450);
        frame.setLayout(null);
        frame.setVisible(true);
    }
    @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();
        }
    }

    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);
    }
}