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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 are keywords?
(A) switch
(B) integer
(C) default
(D) boolean
(E) object

  (D)

  (E)

  (A) & (C)

  (B) & (C)

  Half-n-half Clue
 

2.

Consider the following code:
class ClassA

  Error. There is no code in the class ClassB

  Will compile and run successfully

  Error. There is no code in the constructor ClassA(int x)

  Error. ClassA does not define a no-argument constructor

  Error. ClassB does not define a no-argument constructor

  Half-n-half Clue
 

3.

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
 

4.

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
 

5.

A package is a collection of

  classes

  interfaces

  editing tools

  classes and interfaces

  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)

  (D)

  (A), (D) & (E)

  Half-n-half Clue
 

7.

The keywords reserved but not used in the initial version of Java are:
(A) union
(B) const
(C) inner
(D) goto
(E) boolean
(F) synchronized

  (A), (C) & (E)

  (B),(C) & (D)

  All of these.

  (C) & (E)

  Half-n-half Clue
 


 
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