Demonstrate usage of java Thread.join() method

TestThreadJoin.java

package test.another;

import java.util.concurrent.TimeUnit;


public class TestThreadJoin {
	public static void main(String[] args) throws InterruptedException {
		Thread t1 = new JoinedThread("1");
		t1.start();
		// Thread 2 waits for thread 1 to end
		Thread t2 = new JoinedThread("2",t1);
		t2.start();

		System.out.println("Main thread ends");
	}
}
class JoinedThread extends Thread{
	private String name;
	private Thread waitFor;
	public JoinedThread( String name){
		this(name,null);
	}
	public JoinedThread(String name, Thread waitFor){
		this.name=name;
		this.waitFor=waitFor;
	}
	
	@Override
	public void run() {
		try {
			if(waitFor!=null){
				waitFor.join();
			}
			System.out.println(name+" thread running ...");
			TimeUnit.SECONDS.sleep(3);
		} catch (InterruptedException e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		System.out.println(name+" thread ends.");
	}
	
}