public class Quiz4 extends LinkedList {
	public Object pop() {
		if (head == null) {
			return null;
		} else {
			Node temp = head;
			head = head.getNext();
			return temp;
		}
	}
	
	public void push(Object obj) {
		Node newNode = new Node(obj, head);
		head = newNode;
	}
	
	public boolean isEmpty() {
		return head == null;
	}
}