Main thread continues until worker thread finishes

CountDownLatchDemo.java

import java.util.concurrent.CountDownLatch;
import java.util.concurrent.TimeUnit;

public class CountDownLatchDemo {
	public static void main(String args[]) throws InterruptedException {
		CountDownLatch latch = new CountDownLatch(1);

		Worker first = new Worker(10, latch, "1st-Worker");
		first.start();

		int i = 0;
		while (true) {
			System.out.println("Number:"+i++);
			if (latch.await(1, TimeUnit.SECONDS)) {
				break;
			}
		}
	}

	static class Worker extends Thread {
		private int delay; 
		private CountDownLatch latch; 
  
		public Worker(int delay, CountDownLatch latch, 
					  String name) 
		{ 
			super(name); 
			this.delay = delay; 
			this.latch = latch; 
		} 
  
		@Override
		public void run() 
		{ 
			try
			{ 
				TimeUnit.SECONDS.sleep(delay);
				latch.countDown(); 
				System.out.println(Thread.currentThread().getName() 
								   + " finished"); 
			} 
			catch (InterruptedException e) 
			{ 
				e.printStackTrace(); 
			} 
		} 
	}
}