Stop Watch in Java with GUI

Structure of the Problem Requirements 

In this program we will learn how to make a stop watch in Java with GUI. The stop watch calculate the Nanoseconds, seconds , mints and hours. The GUI provide the start button, stop button and terminate program button. Here is the complete source code of this program which help you in better understanding.

Source Code

import javax.swing.AbstractButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JButton;
import javax.swing.JLabel;
import javax.swing.SwingUtilities;
import java.awt.AWTException;
import java.awt.BorderLayout;
import java.awt.Point;
import java.awt.Robot;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;
import java.awt.event.InputEvent;

public class MainCalss {
  
  //Note: Typically the main method will be in a
  //separate class. As this is a simple one class
  //example it's all in the one class.
  public static void main(String[] args) {
      
      new MainCalss();
  }
  private volatile boolean running = true;
  public MainCalss()
  {
      JFrame guiFrame = new JFrame();
      
      //make sure the program exits when the frame closes
      guiFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
      guiFrame.setTitle("Stopwatch");
      guiFrame.setSize(300,100);
    
      //This will center the JFrame in the middle of the screen
      guiFrame.setLocationRelativeTo(null);
       
      //The first JPanel contains a JLabel and JCombobox
      final JPanel comboPanel = new JPanel();
      JLabel Lbl = new JLabel("Time(day:hrs:min:sec) : ");
      final JLabel timeLbl = new JLabel("");
      
     comboPanel.add(Lbl);
     comboPanel.add(timeLbl);
        
      final JButton startBut = new JButton( "Start");
      JButton stopBut = new JButton( "Stop");
      JButton reStartBut = new JButton( "Re Start");
      
      //The ActionListener class is used to handle the
      //event that happens when the user clicks the button.
      //As there is not a lot that needs to happen we can 
      //define an anonymous inner class to make the code simpler.
      startBut.addActionListener(new ActionListener()
      {
          public void actionPerformed(ActionEvent event)
          {
           
            new Thread(new Runnable()
          {
              public void run()
              {
                  long start = System.currentTimeMillis();
                  while (running)
                  {
                      long time = System.currentTimeMillis() - start;
                      final long seconds = time / 1000;
                      SwingUtilities.invokeLater(new Runnable() {
                           public void run()
                           {
                           int days = (int) seconds/60/60/24;
                         int hours =(int) (seconds/ 60 / 60)%24;
                         int minutes =(int) (seconds / 60) % 60;
                         int sec =(int) seconds % 60;
                            timeLbl.setText(days+" : "
                             +hours+" : "
                            +minutes+" : "
                            +sec+"");
                           }
                      });
                      try { Thread.sleep(100); } catch(Exception e) {}
                  }
              }
          }).start();
           
          }
      });
      stopBut.addActionListener(new ActionListener()
      {
          public void actionPerformed(ActionEvent event)
          {
           try { pauseThread(); } catch(Exception e) {System.out.print("Error: "+e+"\n");}
           
          }
      });
      reStartBut.addActionListener(new ActionListener()
      {
          public void actionPerformed(ActionEvent event)
          {
           try { 
            resumeThread();
            click(startBut,100);
           } catch(Exception e) {System.out.print("Error: "+e+"\n");}
           
          }
      });
      
      //The JFrame uses the BorderLayout layout manager.
      //Put the two JPanels and JButton in different areas.
      guiFrame.add(comboPanel, BorderLayout.NORTH);
      guiFrame.add(startBut,BorderLayout.EAST);
      guiFrame.add(stopBut,BorderLayout.WEST);
      guiFrame.add(reStartBut,BorderLayout.CENTER);
      
      //make sure the JFrame is visible
      guiFrame.setVisible(true);
  }
  public void pauseThread() throws InterruptedException
  {
      running = false;
  }

  public void resumeThread()
  {
      running = true;
  }

  //Simulation of Programmatically clicking a GUI button in Java Swing
  public void click(AbstractButton button, int millis) throws AWTException
  {
      Point p = button.getLocationOnScreen();
      Robot r = new Robot();
      r.mouseMove(p.x + button.getWidth() / 2, p.y + button.getHeight() / 2);
      r.mousePress(InputEvent.BUTTON1_MASK);
      try { Thread.sleep(millis); } catch (Exception e) {}
      r.mouseRelease(InputEvent.BUTTON1_MASK);
  }
}

Output of the Program

Stop Watch in Java with GUI

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Asad Niazi is Software Engineer , Programmer, Web Developers and a young mentor of Tech Solutions Desk and Blogging Solutions . Asad Love to writes about Technology, Programming, Blogging and make money online.