public class PusteBST<T extends Comparable<T>> extends BST<T> {

	public static PusteBST<?> puste = new PusteBST();

	public static <K extends Comparable<K>> BST<K> createPuste(){
		return (BST<K>) puste;
	}

	private PusteBST(){

	}

	@Override
	public BST<T> dodaj(T w){
		return new BST<T>(w);
	}

	@Override
	public boolean exists(T w){
		return false;
	}
}