Interfaces and Abstract Classes -Java Programming MCQ Questions and Answers

A. A contract specifying a set of methods that a class must implement

B. A class that cannot be instantiated

C. A class that contains only static methods

D. A subclass of the Object class

A. Interfaces cannot be implemented by classes

B. Only abstract classes can implement interfaces

C. No, a class can only implement one interface

D. Yes, a class can implement multiple interfaces

A. class

B. abstract

C. interface

D. extends

A. To declare abstract methods

B. To provide a base class with common methods and fields

C. To make a class final

D. None of These

A. Only if it is marked as "final"

B. Only if it has a constructor

C. No, an abstract class cannot be instantiated

D. Yes, an abstract class can be instantiated

A. To extend an abstract class

B. To indicate a constructor

C. To create an instance of a class

D. To indicate that a class is implementing an interface

A. Abstract class

B. Interface

C. Concrete class

D. Static class

A. Only if they are marked as "static"

B. Only if they are marked as "private"

C. No, interfaces cannot have fields

D. Yes, an interface can have constant (final) fields

A. To provide a concrete implementation of a method

B. To indicate that the method is static

C. To declare a method without providing an implementation

D. To make the method final

A. void

B. abstract

C. public

D. none of these