Empty.java

package myBtree;

import java.util.function.Consumer;
import java.util.Optional;

final public class Empty<T extends Comparable<T>> extends Btree<T> {

  public Empty() {}

  @Override
  public void display(Consumer<T> func) {}

  @Override
  public Btree<T> add(T data) {
    return new Node<T>(data, this, this);
  }

  @Override
  public Optional<Btree<T>> find(T data) {
    return Optional.empty();
  }

  @Override
  public boolean isEmpty() {
    return true;
  }

  @Override
  public Btree<T> remove(T data) {
    return this;
  }

}