Part 1: Short Answer Questions

1) What is the output of the following code:

class C {
  public void method1() {
    System.out.print("M1_in_C ");
  }
  public void method2() {
    System.out.print("M2_in_C ");
  }
}
class B extends C {
  public String toString() {
    return "B";
  }
  public void method2() {
    System.out.print("M2_in_B ");
    super.method2();
  }
}
class D extends B {
  public void method1() {
    System.out.print("M1_in_D ");
     method2();
  }
}
class A extends B {
  public void method2() {
    System.out.print("M2_in_A ");
    method1();
  }
}

void main() {
  C[] elements = {new A(), new B(), new C(), new D()};
  for (int i = 0; i < elements.length; i++) {
    elements[i].method1();
    elements[i].method2();
    System.out.println();
  }
}

BREAKDOWN:

You're given a class hierarchy with method overriding, inheritance, and a small twist: polymorphism using an array of the base type C. Each object (A, B, C, D) is stored in a C[] array, and the code loops through each one calling method1() and then method2().