How to access Child class variable having same name as in Parent class and we have only get method in parent class with no setter method

Question

On running below code i am getting this answer Parent 50 Child 50 Parent 50

But I believe it should return Child 90. I am confused over this:

public class PolySameVar {
    public static void main(String []args)
    {
      Parent par = new Parent();
      par.getx();
      Child chld=new Child();
      chld.getx();
      Parent parchld= new Parent();
      parchld.getx();
    }
}


class Parent {
    private int x;
    Parent(){
        x=50;
    }
public void getx(){
        String className = this.getClass().getName();
        System.out.println(className+" "+this.x);
    }
}
class Child extends Parent{
    private int x;
    Child(){
        x=90;
    }
}