Simple about CountLatch usage

TestHarness.java

package com.xqbase.java;

import java.util.concurrent.CountDownLatch;

/**
 * Simple about how to use Latch {@link java.util.concurrent.CountDownLatch}
 * to control the threads start&stop process.
 *
 * @author Tony He
 */
public class TestHarness {

    private static long timeTasks(int nThreads, final Runnable task) throws InterruptedException {
        final CountDownLatch startGate = new CountDownLatch(1);
        final CountDownLatch endGate = new CountDownLatch(nThreads);

        for (int i = 0; i < nThreads; i++) {
            Thread t = new Thread() {
                @Override
                public void run() {
                    try {
                        startGate.await();

                        try {
                            task.run();
                        } finally {
                            endGate.countDown();
                        }
                    } catch (InterruptedException ignored) {}
                }
            };

            t.start();
        }

        long start = System.nanoTime();
        startGate.countDown();
        endGate.await();
        long end = System.nanoTime();

        return end - start;

    }

    public static void main(String[] args) throws InterruptedException {
        final Runnable runnable = new Runnable() {
            @Override
            public void run() {
                System.out.println("Task start...");
                // do some task
                System.out.println("Task end...");
            }
        };

        System.out.println(timeTasks(5, runnable));
    }
}