Lock2.java

package com.winterbe.java8.samples.concurrent;

import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.locks.ReentrantLock;

/**
 * @author Benjamin Winterberg
 */
public class Lock2 {

    public static void main(String[] args) {
        ExecutorService executor = Executors.newFixedThreadPool(2);

        ReentrantLock lock = new ReentrantLock();

        executor.submit(() -> {
            lock.lock();
            try {
                System.out.println(lock.isLocked());
                TimeUnit.SECONDS.sleep(1);
            }
            catch (InterruptedException e) {
                throw new IllegalStateException(e);
            }
            finally {
                lock.unlock();
            }
        });

        executor.submit(() -> {
            System.out.println("Locked: " + lock.isLocked());
            System.out.println("Held by me: " + lock.isHeldByCurrentThread());
            boolean locked = lock.tryLock();
            System.out.println("Lock acquired: " + locked);
        });

        ConcurrentUtils.stop(executor);
    }

}