Design a class named StopWatch.
The class contains:
- Private data fields startTime and endTime with getter methods.
- A no-arg constructor that initializes startTime with the current time.
- A method named start() that resets the startTime to the cur- rent time.
- A method named stop() that sets the endTime to the current time. A method named getElapsedTime() that returns the elapsed time for the stopwatch in milliseconds.
- The System.currentTimeMillis() method returns the current number of milliseconds. (Refer to Section 2.12 for further details.)
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