Java inheritance fields [duplicate]

Answer 1

In java you cannot override an instance variable. The output you are getting is expected. In Java you can only override instance methods and not instance variables.

If you want 20 as an output you may use getter methods over those instance variables.

 class A {
    int i = 10;

    int getI() {
        return i;
    }
}

class B extends A {
    int i = 20;

    int getI() {
        return i;
    }
}

public class MainClass {
    public static void main(String[] args) {
        A a = new B();

        System.out.println(a.getI());
    }
}