import javax.swing.JFrame;
///driver class
public class Stopwatch
{
public static void main(String[] args)
{
JFrame frame = new JFrame("Stopwatch 9.10 Haris Cengic");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.getContentPane().add(new StopWatchPanel());
frame.pack();
frame.setVisible(true);
}
};
//--------------------------------------------------------------//
import javax.swing.JPanel;
import javax.swing.JButton;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import javax.swing.JLabel;
import javax.swing.Timer;
import java.awt.Color;
import java.awt.Font;
import java.awt.Dimension;
import java.awt.Graphics;
public class StopWatchPanel extends JPanel
{
private final int START = 100; //START will be set to 100, keeps the timer accurate
private final int WIDTH = 500, HEIGHT = 110; //size of jpanel
private final int SIZE = 80; // size of the font for the stopwatch
private int second; //shows the current second
private boolean hasstarted; //check if the timer is running
private Timer timer; //new timer
private JButton start, stop, clear; //buttons
private JLabel time; //shows the time in seconds
public StopWatchPanel()
{
timer = new Timer(START, new TimerListener());
second = 0;
hasstarted = true; //set the time to 0 and start the timer
start = new JButton("Start");//new button for start option
start.addActionListener(new ButtonListener());
clear = new JButton("Clear");//new button for clear
clear.addActionListener(new ButtonListener());
time = new JLabel("0.0");
time.setFont(new Font("Arial", Font.ITALIC, SIZE));
add(start);
add(clear);
add(time);
setPreferredSize(new Dimension(WIDTH, HEIGHT));
setBackground(Color.red);
}
public final void paintComponent(Graphics page)
{
super.paintComponent(page); //super.paintCompenent invokes paintComponent and it overwrites whatever is there
final int milli = 10; //base 10, dividing second by 10 and %10 to display the time in seconds AND milliseconds
time.setText(" " + second / milli + "." + second % milli + " ");
}
private class ButtonListener implements ActionListener
{
//this class tells if the timer is running and based
//on that changes the button from 'start' to 'stop'
//also it defines what 'clear' does
public void actionPerformed(ActionEvent event)
{
if (event.getSource() == start)
{
if (hasstarted)
{
hasstarted = false;
timer.start();
start.setText("Stop");
} else
{
hasstarted = true;
timer.stop();
start.setText("Start");
}
} else if (event.getSource() == clear)
{
second = 0;
hasstarted = true;
timer.stop();
start.setText("Start");
}
repaint();
}
}
private class TimerListener implements ActionListener
{
public void actionPerformed(ActionEvent event)
{
second++;
repaint();
}
}
}
//----------------------------------------------------------------------------//
