Stack in Java Generic

Main.java

import java.util.Scanner;  // Import the Scanner class


public class Main {
  public static void main(String[] args){
    int n;
    int buff;
    Scanner scanner = new Scanner(System.in);  // Create a Scanner object

    Stack<Integer> myStack = new Stack<Integer>();
    System.out.println("Ingrese la cantidad de datos que va a adicionar al stack");
    n = scanner.nextInt();

    for(int i=0; i < n; i++){
      buff = scanner.nextInt();
      myStack.push(buff);
    }

    while(!myStack.empty()){
      buff = myStack.top();
      myStack.pop();
      System.out.println(buff);
    }

    // int n;
    // String buff;
    // Scanner scanner = new Scanner(System.in);  // Create a Scanner object
    //
    // Stack<String> myStack = new Stack<String>();
    // System.out.println("Ingrese la cantidad de datos que va a adicionar al stack");
    // n = scanner.nextInt();
    //
    // for(int i=0; i < n; i++){
    //   buff = scanner.next();
    //   myStack.push(buff);
    // }
    //
    // while(!myStack.empty()){
    //   buff = myStack.top();
    //   myStack.pop();
    //   System.out.println(buff);
    // }
  }
}

Node.java

class Node<T extends Comparable<T>> {
    private T value;
    private Node next;

    public Node(T value, Node next) {
        this.value = value;
        this.next = next;
    }

    public Node(T value) {
        this.value = value;
        this.next = null;
    }

    public Node() {
        this.value = null;
        this.next = null;
    }

    public T getValue() { return this.value; }
    public Node getNext() { return this.next; }

    public void setValue(T value) { this.value = value; }
    public void setNext(Node next) { this.next = next; }
}

Stack.java

class Stack<T extends Comparable<T>> {
  private Node<T> head;

  public Stack() {
    this.head = null;
  }

  public void push(T value) {
    Node<T> n_node = new Node<T>(value, this.head);
    this.head = n_node;
  }

  public void pop() {
    if (this.head != null) {
      this.head = this.head.getNext();
    }
  }

  public boolean empty(){
    if (this.head == null) return true;
    else return false;
  }

  public T top(){
    return this.head.getValue();
  }
}