Java OCA OCP Practice Question 1714

Question

Given the following source code, which comment line can be uncommented without introducing errors?. 


abstract class MyClass {
  abstract void f();
  final    void g() {}
//final    void h() {}                              // (1)

  protected static int i;
  private          int j;
}

final class MyOtherClass extends MyClass {
//MyOtherClass(int n) { m = n; }                    // (2)

  public static void main(String[] args) {
    MyClass mc = new MyOtherClass();
  }// w w  w.  j a v  a  2 s. co  m

  void f() {}
  void h() {}
//void k() { i++; }                                // (3)
//void l() { j++; }                                // (4)

  int m;
}

Select the one correct answer.

  • (a) (1)
  • (b) (2)
  • (c) (3)
  • (d) (4)


(c)

Note

The line void k() { i++; } can be re-inserted without introducing errors.

Re-inserting line (1) will cause the compilation to fail, since MyOtherClass will try to override a final method.

Re-inserting line (2) will fail, since MyOtherClass will no longer have a default constructor.

The main() method needs to call the default constructor.

Reinserting line (3) will work without any problems, but re-inserting line (4) will fail, since the method will try to access a private member of the superclass.




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