JAVA

java execution time

long start = System.currentTimeMillis();
class.method();
long time = System.currentTimeMillis() - start;

java measure execution time

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

java execution time

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

running time of java program

long startTime = System.nanoTime();
.....your program....
long endTime   = System.nanoTime();
long totalTime = endTime - startTime;
System.out.println(totalTime);