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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.

Which of the following keywords are used to control access to a class member?
(A) default
(B) abstract
(C) protected
(D) interface
(E) public

  All of these.

  (A), (C) & (E)

  (B), (C) & (E)

  (C) & (E)

  Half-n-half Clue
 

2.

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 where it is declared.

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

  Visible only inside the package.

  Half-n-half Clue
 

3.

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
 

4.

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
 

5.

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

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

  private

  final

  protected

  Half-n-half Clue
 

6.

Which of the following are not keywords?
(A) NULL
(B) implements
(C) protected
(D) extended
(E) string

  (C), (D) & (E)

  (D) & (E)

  (A), (D) & (E)

  (D)

  Half-n-half Clue
 

7.

Which of the following are keywords?
(A) switch
(B) integer
(C) default
(D) boolean
(E) object

  (B) & (C)

  (D)

  (A) & (C)

  (E)

  Half-n-half Clue
 

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