tree.java

package lsbf.fm;

import java.util.Optional;

public class Tree {
  public static void main(String[] args) {
    Node<Integer> root = new Node<>(5);
    root = new Node<>(5, Optional.of(new Node<>(1)), Optional.of(new Node<>(10)));
    System.out.println(root.getLeft().get().getValue());
    System.out.println(root.getRight().get().getValue());
  }
}


class Node<T> {
  private T value;
  private Optional<Node<T>> left;
  private Optional<Node<T>> right;

  public Optional<Node<T>> getLeft() {
    return left;
  }

  public Optional<Node<T>> getRight() {
    return right;
  }

  public T getValue() {
      return value;
  }

  public Node(T value) {
      this.value = value;
      this.left = Optional.empty();
      this.right = Optional.empty();
  }

  public Node(T value, Optional<Node<T>> left, Optional<Node<T>> right) {
      this.value = value;
      this.left = left;
      this.right = right;
  }

}