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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.

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

  Class result should be declared public.

  Result body is not fully defined.

  Student class is not available.

  Test class is not available.

  Half-n-half Clue
 

2.

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)

  protected

  private

  final

  Half-n-half Clue
 

3.

Which of the following defines a legal abstract class?

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

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

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

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

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

  Half-n-half Clue
 

4.

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
.

  (D)

  (B) & (C)

  (A)

  (A) & (C)

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

  (D) & (E)

  (A), (D) & (E)

  (D)

  (C), (D) & (E)

  Half-n-half Clue
 

7.

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

  private

  protected

  Half-n-half Clue
 


 
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