Type wildcards in Generic

[gvm]

Hi
I would appreciate if any one would please correct whats wrong in my code. at line // <<<<< ERROR

	////////////////////////////////////////////
	// Type wild cards
	
	class Base<T>
	{
		protected LinkedList<T> items = new LinkedList<T>();
		public void enqueue(T item){
			items.addLast(item);
		}
		public T dequeue(){
			return items.removeFirst();
		}
		
		public boolean isEmply(){
			return (items.size() == 0);
		}
		public void addAll(Collection<? extends T> coll){
			// add all items from coll to the end of the queue
			for(T item : coll)
				enqueue(item);
		}
	} // end of class Base
	
	class A<T> extends Base<T>{
		public void enqueue(T item){
			System.out.println("Class A");
			items.addLast(item);
		}
		public T dequeue(){
			System.out.println("Class A");
			return items.removeFirst();
		}
		
		public boolean isEmply(){
			System.out.println("Class A");
			return (items.size() == 0);
		}
		public void addAll(Collection<? extends T> coll){
			System.out.println("Class A");
			// add all items from coll to the end of the queue
			for(T item : coll)
				enqueue(item);
		}
	} //end of class A
	
	class B<T> extends Base<T>{
		public void enqueue(T item){
			System.out.println("Class B");
			items.addLast(item);
		}
		public T dequeue(){
			System.out.println("Class B");
			return items.removeFirst();
		}
		public boolean isEmpty(){
			System.out.println("Class B");
			return (items.size() == 0);
		}
		public void addAll(Collection<? extends T> coll){
			System.out.println("Class B");
			// add all items of coll to the endof the queue
			for(T item: coll)
				enqueue(item);
		}
	} // endof class B
	
	Base<Integer> intBase = new Base<Integer>();
	A<Integer> intA = new A<Integer>();
	B<Integer> intB = new B<Integer>();
	
	intA.enqueue(10); //<<<<< ERROR

[JosAH]

What was the compiler whining about?

kind regards,

Jos (<--- too lazy to copy/paste, correct and compile)