What dose it mean to declare a vaiable private?

Question

Tutor

Answer 1

That way, you prevent other people who extend your code in the future to make potentially invalid changes to your variable by manipulating the variable directly.

Answer 2

It means that a class that extends the class with the private variable cannot use the private var.

Answer 3

Example:

class A{
private int x=5;
public int y=6;
}
public class Program extends A
{

public static void main(String[] args) {
A a=new A();
System.out.print(a.x);
}
}

//Error .
You cannot access x as it is private