The StopWatch class introduces a versatile stopwatch component with enhanced functionality in Java. Extending JLabel and implementing the MouseListener interface, this interactive component not only measures elapsed time but also dynamically updates to display the current time in the format “Hours:Minutes:Seconds:Milliseconds” while running. Clicking on the stopwatch initiates the timer, and subsequent clicks allow users to stop the timer, showing the precise elapsed time. A unique feature includes continuous real-time updates on the label, providing a seamless display of the ongoing time.

This implementation showcases the power of Swing components, event-driven programming, and the use of a javax.swing.Timer to create an engaging and responsive stopwatch experience within a graphical user interface.

The label continuously updates with the current elapsed time while the stopwatch is running. The javax.swing.Timer triggers the updateLabel() method every 100 milliseconds to refresh the displayed time.