Tell me what's wrong and how to fix it

Main.java

package com.vive.tellmetheanswer;

public class Main {

    public static void main(String[] args) {
        var o = new Child();

        o.i = 1;
        o.j = 2;

        o.display();
    }
}

class Parents {
    public int i;
    private int j;
}

class Child extends Parents {
    void display() {
        super.j = super.i + 1;
        System.out.println(super.i + " " + super.j);
    }
}

I’d like to fix my previous answer.
It’s not allowed to change or get private parameter j directly.

Following is the way to fix it:
To build a private setter for j in class Parents.
To override setter and change the modifier to public in class Child. Inside the public setter, call super.setter and pass the integer.
To substitute o.j = 2 with o.setJ(2).