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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:
class ClassA

  Error. ClassB does not define a no-argument constructor

  Error. ClassA does not define a no-argument constructor

  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)

  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?

  protected

  private

  private OR protected

  public

  Half-n-half Clue
 

3.

A package is a collection of

  interfaces

  classes and interfaces

  editing tools

  classes

  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.

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

  Result body is not fully defined.

  Class result should be declared public.

  Test class is not available.

  Student class is not available.

  Half-n-half Clue
 

6.

Consider the following code:
interface Area

  Interface definition is incomplete

  Method compute() in class Room should be declared public

  Method compute() in interface Area should be declared public

  All of these

  Half-n-half Clue
 

7.

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

  Visible only inside the package.

  Visible only in the class where it is declared.

  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.

  Half-n-half Clue
 


 
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