Java Programming Multiple Choice Questions - Interfaces

This section focuses on the "Interfaces" of the Java programming. These Multiple Choice Questions (mcq) should be practiced to improve the Java programming skills required for various interviews (campus interview, walk-in interview, company interview), placement, entrance exam and other competitive examinations.

1. Which of these keywords is used to define interfaces in Java?

A. interface
B. Interface
C. intf
D. Intf

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2. A java interface can contain _______.

A. Abstract methods(unimplemented) and implemented methods both
B. public Abstract methods
C. public static Final Variables only
D. public static Final Variables and abstract methods both

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3. Which of these access specifiers can be used for an interface?

A. Public
B. private
C. Protected
D. All of the mentioned

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4. Which of the following is a correct interface?

A. abstract interface A { abstract void print(); { }}
B. abstract interface A { print(); }
C. interface A { void print() { } }
D. interface A { void print(); }

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5. Which of the following classes directly implement Set interface?

A. Vector
B. HashSet
C. HashTable
D. LinkedList

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