To get the elapsed time of an operation in hours in Java, we use the System.currentTimeMillis() method. The java.lang.System.currentTimeMillis() returns the current time in milliseconds.
Declaration −The java.lang.System.currentTimeMillis() is declared as follows −
public static long currentTimeMillis()
The method returns time difference in milliseconds between the current time and midnight, January 1, 1970 (UTC or epoch time).
Let us see a program to compute the elapsed time of an operation in hours in Java −
public class Example { public static void main(String[] args) throws Exception { // finding the time before the operation is executed long start = System.currentTimeMillis(); for (int i = 0; i <5; i++) { Thread.sleep(60); } // finding the time after the operation is executed long end = System.currentTimeMillis(); // finding the time difference float msec = end - start; // converting it into seconds float sec= msec/1000F; // converting it into minutes float minutes=sec/60F; // converting it into hours float hours=minutes/60F; System.out.println(hours + " hours"); } }
8.333334E-5 hours