PracticalJAVACode 的源码

				0 new #2 
				                      //Create an object of type java.lang.Object
				                      //and push a reference to it(lock).
				3 dup                 //Duplicate the top stack value and push it.
				4 invokespecial #3 
				                      //Pop the object reference(lock), and invoke
				                      //its constructor.
				7 astore_1            //Pop the object reference(lock) and store
				                      //it at index 1 of the local variable table.