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Designing a Stopwatch Class

   

Added on  2019-09-16

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/**A stopwatch accumulates time when it is running. You can repeatedly start and stop the stopwatch. You can use astopwatch to measure the running time of a program.*/public class StopWatch{ private long elapsedTime;private long startTime;private boolean isRunning;/**Constructs a stopwatch that is in the stopped stateand has no time accumulated.*/public StopWatch(){ reset();}/**Starts the stopwatch. Time starts accumulating now.*/public void start(){ if (isRunning) { return; }isRunning = true;startTime = System.currentTimeMillis();}/**Stops the stopwatch. Time stops accumulating and isis added to the elapsed time.*/public void stop(){ if (!isRunning) { return; }isRunning = false;long endTime = System.currentTimeMillis();elapsedTime = elapsedTime + endTime - startTime;}/**Returns the total elapsed time.@return the total elapsed time*/public long getElapsedTime(){ if (isRunning) { long endTime = System.currentTimeMillis();return elapsedTime + endTime - startTime;}else{return elapsedTime;}}
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