Stopwatch Utility

Write a StopwatchUtility class that includes a startStop method, a getTimeElapsed method, and a reset method. Think about what each of those behaviors means for the time that we're recording.

You can use the Java call System.currentTimeMillis() to get the current time in milliseconds (expressed as a long type). This time represents the number of milliseconds that have passed since Jan 1, 1970.

The final version of your stopwatch should be able to:

• start the watch, stop the watch, and view time elapsed
• start the watch, and view the current time elapsed without having to stop the watch
• start the watch, stop the watch, wait a moment, then start the watch again. The watch's time elapsed should only include the amount of time that has passed when the watch was running.