incompatible types : java.lang.Object cannot be converted to T

Question

Here is my code:

package datastructures;

import java.util.Iterator;

public class Stack{
    private class Node{
        T data;
        N         


        

Answer 1

You are declaring Node inner type with its own type parameter, so T of Node shadows T of Stack, and they are essentially different types.

Remove declaration of type parameter in your Node type (that's probably what you mean for it)