ThreadClass.java

package codingInterview.thread;

//Java program to demonstrate thread states
class thread implements Runnable
{//states : NEW,Runnable, Waiting, blocked,timewaiting, terminated
	public void run()
	{
		// moving thread2 to timed waiting state
		try
		{
			Thread.sleep(1500);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		
		try
		{
			Thread.sleep(1500);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		System.out.println("State of thread1 while it called join() method on thread2 -"+
				ThreadClass.thread1.getState());
		try
		{
			Thread.sleep(200);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}	 
	}
}

public class ThreadClass implements Runnable
{
	public static Thread thread1;
	public static ThreadClass obj;
	
	public static void main(String[] args)
	{
		obj = new ThreadClass();
		thread1 = new Thread(obj);
		
		// thread1 created and is currently in the NEW state.
		System.out.println("State of thread1 after creating it - " + thread1.getState());
		thread1.start();
		
		// thread1 moved to Runnable state
		System.out.println("State of thread1 after calling .start() method on it - " + 
			thread1.getState());
	}
	
	public void run()
	{
		thread myThread = new thread();
		Thread thread2 = new Thread(myThread);
		
		// thread1 created and is currently in the NEW state.
		System.out.println("State of thread2 after creating it - "+ thread2.getState());
		thread2.start();
		
		// thread2 moved to Runnable state
		System.out.println("State of thread2 after calling .start() method on it - " + 
			thread2.getState());
		
		// moving thread1 to timed waiting state
		try
		{
			//moving thread2 to timed waiting state
			Thread.sleep(200);
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		System.out.println("State of thread2 after calling .sleep() method on it - "+ 
			thread2.getState() );
		
		
		try
		{
			// waiting for thread2 to die
			thread2.join();
		} 
		catch (InterruptedException e) 
		{
			e.printStackTrace();
		}
		System.out.println("State of thread2 when it has finished it's execution - " + 
			thread2.getState());
	}
	
}