import java.util.concurrent.locks.Lock;

public class Worker implements Runnable {

	String name = null;
	Lock lock = null;

	public Worker(String name, Lock lock) {
		this.name = name;
		this.lock = lock;
	}

	@Override
	public void run() {
		while (true) {
			lock.lock();
			try {
				Thread.sleep(1000);
			} catch (InterruptedException e) {
				// TODO Auto-generated catch block
				e.printStackTrace();
			}
			System.out.println(name);
			lock.unlock();
		}
	}
}

import java.util.concurrent.locks.Lock;
import java.util.concurrent.locks.ReentrantLock;

public class StartWorkers {

	private void run(int n) {
		Lock lock = new ReentrantLock(true);
		Worker[] workers = new Worker[n];
		for (int i = 0; i < n; ++i) {
			workers[i] = new Worker(String.valueOf(i), lock);
		}

		Thread[] threads = new Thread[n];
		for (int i = 0; i < n; ++i) {
			threads[i] = new Thread(workers[i]);
			threads[i].start();
		}

	}

	public static void main(String[] args) {
		StartWorkers startWorkers = new StartWorkers();
		startWorkers.run(5);

	}
}