OnJava8-Examples/onjava/Timer.java

// onjava/Timer.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
package onjava;
import static java.util.concurrent.TimeUnit.*;

public class Timer {
  private long start = System.nanoTime();
  public long duration() {
    return NANOSECONDS.toMillis(
      System.nanoTime() - start);
  }
  public static long duration(Runnable test) {
    Timer timer = new Timer();
    test.run();
    return timer.duration();
  }
}