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Java - System.nanoTime() - what this methods really returns
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System.nanoTime() method returns the current value of the running Java Virtual Machine's high-resolution time source, in nanoseconds. The best application of this time could be measuring how much time took some operations.
System.nanoTime method usage example
long t1 = System.nanoTime();
Thread.sleep(1000);
long t2 = System.nanoTime();
long dt = t2 - t1;
System.out.println("Sleeping time is " + dt + " ns.");Output:
Sleeping time is 1000143702 ns.