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Java Programming : Classes and Keywords: Multiple Choice


Answer the following questions about classes and reserved keywords as used in the Java programming language.

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Multiple choice

Your Performance  

1.

Consider the following code:
interface Area

  All of these

  Interface definition is incomplete

  Method compute() in interface Area should be declared public

  Method compute() in class Room should be declared public

  Half-n-half Clue
 

2.

We would like to make a member of a class visible in all subclasses regardless of what package they are in. Which one of the following keywords would achieve this?

  private OR protected

  public

  protected

  private

  Half-n-half Clue
 

3.

The use of protected keyword to a member in a class will restrict its visibility as follows:

  Visible in all classes in the same package and subclasses in other packages.

  Visible only in the class and its subclass in the same package.

  Visible only inside the package.

  Visible only in the class where it is declared.

  Half-n-half Clue
 

4.

Package p1 contains the following code:
package p1;
public class Student

  Student class is not available.

  Class result should be declared public.

  Result body is not fully defined.

  Test class is not available.

  Half-n-half Clue
 

5.

Which of the following statements about abstract methods/classes in Java are true?
1. An abstract class cannot be instantiated.
2. Constructors cannot be abstract.
3. A subclass of an abstract class must defined the abstract methods.
4. Static methods may be declared abstract.

  Line 1, line 2 and line 3 only

  Line 1 only

  Line 1 and line 2 only

  Line 2 only

  All are true

  Half-n-half Clue
 

6.

Which keyword can protect a class in a package from accessibility by the classes outside the package?

  protected

  private

  final

  don't use any keyword at all (make it default)

  Half-n-half Clue
 

7.

The concept of multiple inheritance is implemented in Java by
(A) extending two or more classes
(B) extending one class and implementing one or more interfaces
(C) implementing two or more interfaces
(D) all of these

  (B) & (C)

  (A)

  (D)

  (A) & (C)

  Half-n-half Clue
 


 
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