AlgorithmRunningTime.java

public class AlgorithmRunningTime {

    public static void main(String[] args) {

        final int N = 2000000; // test data

        NanoTimer t = new NanoTimer();
        long startTime, runningTime;
        int sum = 0;

        startTime = t.getStartTime();
        for (int i = 1; i < N; i*=2){
            for (int j = 0; j < i; j++){
                sum++;
            } // for j
        } // for i
        runningTime = t.getRunningTime();
        System.out.println(t.toString());
    } // main()

} // class AlgorithmRunningTime


class NanoTimer {

   /*
    *   Class:      NanoTimer.java
    *   Purpose:    Get program running times
    *   Creator:    Chris Clarke
    *   Created:    03.04.2014
    */

    public long startTime = 0, runningTime = 0;

    public long getStartTime() {
        startTime = System.nanoTime();
        return startTime;
    }

    public long getRunningTime() {
        runningTime = System.nanoTime() - startTime;
        return runningTime;
    }

    public String toString() {
        return "Running time: " + runningTime + " ns";
    }

} // end class NanoTimer