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Compute the elapsed time of an operation in Java
To compute the elapsed time of an operation 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 Java −
Example
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;
System.out.println(msec + " milliseconds");
// converting it into seconds
float sec= msec/1000F;
System.out.println(sec + " seconds");
// converting it into minutes
float minutes=sec/60F;
System.out.println(minutes + " minutes");
}
}Output
300.0 milliseconds 0.3 seconds 0.0050000004 minutes
Updated on: 26-Jun-2020
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