Question

 public class Node : IComparable

{
    public object element;
    public Node left;
    public Node right;
    public int height;


    public Node(object data, Node L, Node R)
    {

        element = data;
        left = L;
        right = R;
        height = 0;


    }
    public Node(object data)
    {

        element = data;
        left = null;
        right = null;
        height = 0;


    }

    public int CompareTo(object obj)
    {
        return (this.element.CompareTo((Node)obj.element));


    }


}

in this avl tree i want to compare left and right node and other balance methode for it but in start point it doesn’t support in compareto in this line of code

 public int CompareTo(object obj)
    {
        return (this.element.CompareTo((Node)obj.element));


    }

although i used interface Icomaparable..anyone tell what is missing in it it??????????????

Answer 1

Your element property is of type object, so it doesn’t implement IComparable. Instead you could make a generic class with the constraint that the data element of type T must implement IComparable<T>:

public class Node<T> : IComparable<Node<T>> where T: IComparable<T>
{
    public T element;
    public Node<T> left;
    public Node<T> right;
    public int height;


    public Node(T data, Node<T> L, Node<T> R)
    {

        element = data;
        left = L;
        right = R;
        height = 0;


    }
    public Node(T data)
    {

        element = data;
        left = null;
        right = null;
        height = 0;


    }

    public int CompareTo(Node<T> other)
    {
        return element.CompareTo(other.element);
    }
}