Btree.java

package myBtree;

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

public abstract class Btree<T extends Comparable<T>> {

  public abstract void display(Consumer<T> func);
  public abstract Btree<T> add(T data);
  public abstract Optional<Btree<T>> find(T data);
  public abstract boolean isEmpty();
  public abstract Btree<T> remove(T data);

}