Question

How to calculate execution time in Java

Answer 1

public class MyClass {
    public static void m(int num) {
        long sum = 0;
        for (int i = 0; i < num; i++)
            sum += i;
    }
    public static void main(String args[]) {
        long start = System.nanoTime();

        m(1000);
        
        long end = System.nanoTime();

        System.out.println("Execution time: " + (end - start) + " nanoseconds");
    }
}




/*
run:

Execution time: 15118 nanoseconds

*/

 

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