Java - System.nanoTime() Examples

package com.logicbig.example.system;

public class NanoTimeExample {

    public static void main(String... args) {
        long l = System.nanoTime();
        System.out.println(l);

        long l2 = System.currentTimeMillis();
        System.out.println(l2);
    }
}

package com.logicbig.example.system;

public class NanoTimeExample2 {

    public static void main(String... args) throws InterruptedException {
        long startNanos = System.nanoTime();
        long startMillis = System.currentTimeMillis();

        Thread.sleep(100);

        long timeInNanos = System.nanoTime() - startNanos;
        long timeInMillis = System.currentTimeMillis() - startMillis;
        System.out.println("time taken in nanos: " + timeInNanos);
        System.out.println("time taken in mills: " + timeInMillis);
    }
}