Object Type Casting

class A {
    int x = 10;

    int get() {
        return x;
    }
}

class B extends A {
    int x = 20;

    int get() {
        return x;
    }
}

public class Mains {
    public static void main(String[] args) {
        B b = new B();
        System.out.println(b.get()); //20
        System.out.println(b.x); //20

        A a = new B();
        System.out.println(a.get()); //20
        System.out.println(a.x); //10

        A a1 = new A();
        System.out.println(a1.get()); //10
        System.out.println(a1.x); //10
    }
}