Hi, everyone!
			

			

			

			I have only noticed that notifyAll and wait are
			

			invoked in a class that extents the thread class
			

			or implements runable interface.
			

			

			

			But there is a piece of code like the following,
			

			

			--------
			

			//class A is not a class that extends thread or
			

			//implements runable
			

			class A
			

			{
			

			private static resourceC;
			

			

			public void methodB(String someargs)
			

			{
			

			//check the status of resourceC
			

			wait(some time);
			

			//do some business with resourceC
			

			}
			

			

			public void methodD(String someargs)
			

			{
			

			//check the status of resourceC
			

			notifyAll();
			

			//do some business with resourceC
			

			}
			

			

			}
			

			--------
			

			

			

			I wondered whether we can call notifyAll or wait
			

			method outside a class that is not extended from
			

			thread or implemented from runable?
			

			

			BTW: The above class is a class that is invoked by some
			

			servlets of a web server.
			

			

			Who can give me a simple explanation?
			

			

			

			Thanks in advance,
			

			George