class TreeNode {
public:
	Object obj;
	TreeNode *leftChild;
	TreeNode *rightChild;

private:
	Object getObject() {
		return obj;
	}

	TreeNode* getleftChild() {
		return leftChild;
	}

	TreeNode* getRightChild() {
		return rightChild;
	}

    void inOrderPrint() {
       if(leftChild != null)
          leftChild.inOrderPrint();
       obj.print();
       if(rightChild != null)
          rightChild.inOrderPrint();
    }

}


class Tree {
private:
    TreeNode *root;

public:
    TreeNode* getRoot() {return root};
    void inOrderPrint() {root.inOrderPrint()};

};

...

Tree *t = ...;
//insertions
t->inOrderPrint();