There are two ways to syanchronize access to an object 

1st one is using synchronized keyword for example 
	
	Synchronized type methodname(arg-list)
		{
			//synchrinized method body
		}

2nd way s using synchronized block

	synchronized(object)
	{
		//synchronized statement

	}

bu using thread in your main program

The way you can synchronize the block is:-

synchronized(dummy object)
	{
		//synchronized statement

	}
In dummy object you can use this or u can create a dummy 
object by using new Keyword.

What answer Vikki is posted as the first one is not the way 
of synchronizing the block but it's a way to synchronizing 
a method.