class Program04
{
	public static void main(String args[])
	{
		new Thread(new MasikSzal()).start();

		while(true)
		{
			System.out.println("Főszál");
			try
			{
				Thread.sleep(2000);
			}
			catch(InterruptedException e)
			{
				Thread.currentThread().interrupt();
			}
		}

	}
}
class MasikSzal implements Runnable
{
	public void run()
	{
		while(true)
		{
			System.out.println("Másik szál");
			try
			{
				Thread.sleep(4000);
			}
			catch(InterruptedException e)
			{
				Thread.currentThread().interrupt();
			}			
		}
	}	
}