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package trees;
import java.util.*;

/**
 *
 * @author kvaradar
 */
public interface Tree<E> {
    /* See the textbook for what these methods are supposed to mean*/
    public int size();
    public boolean isEmpty();
    public Iterator<E> iterator();
    public Iterable<Position<E>> positions();
    public E replace(Position<E> v, E e);
    public Position<E> root();
    public Position<E> parent(Position<E> v);
    public Iterable<Position<E>> children(Position<E> v);
    public boolean isInternal(Position<E> v);
    public boolean isExternal(Position<E> v);
    public boolean isRoot(Position<E> v);

}