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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.

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

  private

  public

  protected

  Half-n-half Clue
 

2.

Which of the following defines a legal abstract class?

  abstract class Vehicle {<br>
              abstract void display(); {<br>
                System.out.println("Car"); }}

  abstract class Vehicle {<br>
              abstract void display(); }

  class abstract Vehicle {<br>
              abstract void display(); }

  abstract Vehicle {<br>
              abstract void display(); }

  class Vehicle {<br>
              abstract void display(); }

  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 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
 

4.

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

  (E)

  (B) & (C)

  (D)

  (A) & (C)

  Half-n-half Clue
 

5.

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

  (A) & (C)

  (A)

  (D)

  (B) & (C)

  Half-n-half Clue
 

6.

Which of the following statements are true?
(A) An abstract class may not have any final methods.
(B) A final class may not have any abstract methods.
(C) An inner class may be declared with any accessibility keyword.
(D) Transient variables must be static
.

  (B) & (C)

  (A) & (C)

  (A)

  (D)

  Half-n-half Clue
 

7.

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

  Class result should be declared public.

  Student class is not available.

  Result body is not fully defined.

  Test class is not available.

  Half-n-half Clue
 


 
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