//method in class Nodo
public Integer eachNodeHeight(){

    if(this.left == null && this.right == null){

        return 0;
    }
    if(this.left != null && this.right != null){
        if(this.left.eachNodeHeight() > this.right.eachNodeHeight()){
            this.height = this.left.eachNodeHeight() + 1;
            return this.height;
        }
        else{
            this.height = this.right.eachNodeHeight() + 1;
            return this.height;
        }
    }

    if(this.left != null && this.right == null){
        this.height = this.left.eachNodeHeight() + 1;
        return this.height;
    }
    else{
        this.height = this.right.eachNodeHeight() + 1;
        return this.height;

    }

}

//method in class BinaryTree
public Integer eachNodeHeight(){
    if(this.root == null)
        return 0;
    else
        return this.root.eachNodeHeight();

}