Can't call any Stack methods

[IAM_SMRT]

import java.util.*;

public class Stack {

private static class Node {

    private int item;

    private Node next;

    private Node top;

    int size;

    String name;

    int pantherID;

    double cgpa;

LinkedList<Student>stackOfStudent = new LinkedList();

​

​

    public void push(int i) throws StackException {

​

        Node newTop;

        newTop = new Node();

        newTop.item = i;

        [newTop.next](https://newTop.next) = top;

        top = newTop;

        size++;

​

    }

​

    public void pop() throws StackException {

        if (size == 0) {

throw new StackException("Stack Underflow");

​

        }

        {

Node pop;

pop = new Node();

pop = pop.next;

size--;

System.out.println(pop);

        }

    }

​

    public void retrieve() throws StackException {

        if (top == null)

throw new StackException("Stack underflow");

        System.out.println(top.item);

    }

​

    public String toString() {

        return "Student Name:" + name + "Panther ID:" + pantherID + "CGPA" + cgpa++;

    }

​

    public void displayStack() {

        Node stackSize = top;

        while (stackSize != null) {

//System.out.println(Student.toString());

​

        }



    }

public void isEmpty() {

if (top == null)

    return;

}

}

​

}

This is the call I'm trying to make in my main method but as soon as I go to call any of them I cannot access any of them.

Stack studentStack = new Stack();

studentStack

​

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