Inner Classes Questions with Answers | Java Programming MCQ | Page 3

In Java Programming, Inner Classes allow you to define a class within another class, enhancing encapsulation and code readability. This topic frequently appears in TCS, Accenture, and Infosys Java interview questions. In this section on Inner Classes questions with answers, you’ll explore member inner classes, static nested classes, anonymous inner classes, and local inner classes. Practicing these Java programming MCQs helps you understand how nested classes interact with outer classes and how they improve object-oriented design. Detailed explanations provided with each question will strengthen your grasp on Java scope, access modifiers, and real-world use cases — making it perfect for technical interview preparation.

Showing 10 of 27 questions

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Q21

Which of the following is true about anonymous inner classes?

A They can have constructors
B They can extend a class and implement multiple interfaces
C They can implement multiple interfaces
D They can extend one class or implement one interface

Answer: Option D

Explanation: Anonymous inner classes can extend one class or implement one interface, but not both.

Q22

What is the bytecode file name for a member inner class?

A InnerClass.class
B OuterClass_InnerClass.class
C OuterClass$InnerClass.class
D OuterClass.InnerClass.class

Answer: Option C

Explanation: Member inner classes have bytecode files named OuterClass$InnerClass.class

Q23

Can we have static methods in a member inner class?

A Yes, they can have static methods
B No, they cannot have static methods
C Only if the outer class is also static
D Only static final variables are allowed

Answer: Option B

Explanation: Member inner classes cannot have static methods because they are associated with outer class instance.

Q24

Which inner class is commonly used for event handling in GUI?

A Static nested class
B Member inner class
C Local inner class
D Anonymous inner class

Answer: Option D

Explanation: Anonymous inner classes are widely used for event handlers in GUI programming.

Q25

Can an outer class access private members of inner class?

A No, never
B Yes, always
C Only if the inner class is static
D Only if the members are protected

Answer: Option B

Explanation: Outer classes can access all members of inner classes, including private ones.

Q26

What happens if you declare an inner class as final?

A It cannot be instantiated
B It cannot be extended
C It becomes immutable
D It cannot access outer class members

Answer: Option B

Explanation: Final inner classes cannot be extended, same as regular final classes.

Q27

Which of the following is NOT a type of inner class in Java?

A Member inner class
B Local inner class
C Abstract inner class
D Anonymous inner class

Answer: Option C

Explanation: Abstract classes are a type of class, not a category of inner class.

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Inner Classes Questions and Answers

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