Learn Java Enums MCQ Questions with answers and solutions.

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Q. What happens when you try to subclass an enum?

(A) It compiles but fails at runtime
(B) It compiles and runs
(C) Compile-time error
(D) It throws an exception

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Q. What type of method is `values()` in an enum?

(A) Static method added by compiler
(B) Instance method
(C) Method from Enum class
(D) Custom method defined by user

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Q. Can an enum be abstract?

(A) Yes, if it has abstract methods
(B) No, enums cannot be abstract
(C) Only in Java 15+
(D) Only if declared inside an interface

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Q. What will this code print?

Code:

enum Test { A, B, C }
System.out.println(Test.A.compareTo(Test.C));

(A) -2
(B) 0
(C) 2
(D) -1

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Q. Is it possible to override `toString()` in an enum?

(A) No
(B) Yes, but only once for all constants
(C) Yes, and even per constant using anonymous classes
(D) Only for enum fields, not constants

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Q. Which enum constant syntax allows defining constant-specific behavior?

(A) NORMAL
(B) SPECIAL()
(C) SPECIAL { @Override method }
(D) static SPECIAL

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Q. What happens if you call `name()` on a null enum reference?

(A) Returns null
(B) Throws NullPointerException
(C) Throws IllegalArgumentException
(D) Returns empty string

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Q. Enums are best used when:

(A) Values may change dynamically
(B) You need a fixed set of constants
(C) You require user input
(D) You are building a REST API

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Q. Which of the following can NOT be done in enum?

(A) Declare fields
(B) Create abstract methods
(C) Use anonymous classes
(D) Inherit another class

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Q. What will this code do?

Code:

enum MyEnum {
  A { void show() { System.out.println("A"); } },
  B { void show() { System.out.println("B"); } };
  abstract void show();
}
MyEnum.A.show();

(A) Compile error
(B) Prints A
(C) Prints B
(D) Throws exception

Java Enums MCQs with answers Page - 5

Q. What happens when you try to subclass an enum?

Q. What type of method is `values()` in an enum?

Q. Can an enum be abstract?

Q. What will this code print?

Q. Is it possible to override `toString()` in an enum?

Q. Which enum constant syntax allows defining constant-specific behavior?

Q. What happens if you call `name()` on a null enum reference?

Q. Enums are best used when:

Q. Which of the following can NOT be done in enum?

Q. What will this code do?

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