including a java class in another class (extends) error

I've written two files (Node.java and priorityQueue.java) that are in the same directory, and I'm trying to use Node inside priorityQueue by using "extends".

However, I'm getting "error: cannot find symbol" wherever "Node" appears in my priorityQueue.java file.

Node.java:

public class Node {
  private int priority;
  private String name;
  public Node(int priority, String name) {
    this.priority = priority;
    this.name = name;
  }
  // some methods ...
}

priorityQueue.java:

import java.util.ArrayList;

public class priorityQueue extends Node {
  public ArrayList<Node> pq = new ArrayList<Node>();
  // some methods ...
  public static void main(String[] args) {
    priorityQueue p = new priorityQueue();
    Node a = new Node(10, "a");
    p.enqueue(a);
    System.out.println(p.dequeue().getName());
  }
}

This is the first error message:

priorityQueue.java:4: error: cannot find symbol
    public ArrayList<Node> pq = new ArrayList<Node>();
                     ^

I'm more used to c++ and c using imports, but I've been told that extends should work without importing anything as long as the files are in the same directory. What am I missing?

I'm on windows 10, java 14.0.1, and using notepad++ as an IDE.

do you want use priority queue based on node ? if it is as i expect u shouldn't extends the class Node but u will create an Node's object through the Priority Queue class