Measure execution time for a Java method [duplicate]

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To be more precise, I would use nanoTime() method rather than currentTimeMillis():

long startTime = System.nanoTime();
myCall(); 
long stopTime = System.nanoTime();
System.out.println(stopTime - startTime);

In Java 8 (output format is ISO-8601): 

Instant start = Instant.now();
Thread.sleep(63553);
Instant end = Instant.now();
System.out.println(Duration.between(start, end)); // prints PT1M3.553S

Guava Stopwatch:

Stopwatch stopwatch = Stopwatch.createStarted();
myCall();
stopwatch.stop(); // optional
System.out.println("Time elapsed: "+ stopwatch.elapsed(TimeUnit.MILLISECONDS));

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