How to use a Timer without a delay?

Question

I know that:

Thread.sleep(1000)

means delay for exactly one second before executing the code, but it there a way to use a timer to just count the time that past when the program executes without delaying the program? Thanks.

Answer 1

Keep the current time in a variable

long oldTime = System.nanoTime();

At the end of your program, print the current time - the old time and that will be the execution time in nano seconds.

System.out.println((System.nanoTime() - oldTime));