Java Enums MCQs with answers Page - 4

You will find multiple-choice questions (MCQs) related to #Java Enums here. Go through these questions to prepare effectively for your upcoming exams and interviews.

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A

Admin • 828.03K Points
Coach

Q. Can enum constants have their own method implementations?

  • (A) No, all methods are shared
  • (B) Yes, using anonymous class bodies per constant
  • (C) Only static methods can be overridden
  • (D) Only if the enum is final

D

Dhruva Jagannath • 660 Points
Invincible

Q. Which of the following is the correct way to iterate over an enum in Java?

  • (A) Using a for-each loop on Enum.values()
  • (B) Using a while loop on Enum.length()
  • (C) Using Enum.iterator()
  • (D) Using Enum.getList()

D

Dhruva Jagannath • 660 Points
Invincible

Q. What does the `ordinal()` method of an enum return?

  • (A) The name of the constant
  • (B) The position of the constant in the enum declaration
  • (C) The hashcode of the constant
  • (D) The string value of the enum

D

Dhruva Jagannath • 660 Points
Invincible

Q. What will this code print?

Code: 
enum Level { LOW, MEDIUM, HIGH }
System.out.println(Level.HIGH.ordinal());
  • (A) 1
  • (B) 2
  • (C) HIGH
  • (D) 0

D

Dhruva Jagannath • 660 Points
Invincible

Q. Can enum constants be compared using '=='?

  • (A) No, '==' only works with primitives
  • (B) Yes, enum constants are singleton and can be compared with '=='
  • (C) Only if you override equals()
  • (D) Only in Java 11 and above

D

Dhruva Jagannath • 660 Points
Invincible

Q. What is the default return value of the `toString()` method in enums if not overridden?

  • (A) The ordinal
  • (B) The enum class name
  • (C) The constant name
  • (D) null

D

Dhruva Jagannath • 660 Points
Invincible

Q. What will happen if you use `switch-case` with an enum and forget one constant?

  • (A) Compile-time error
  • (B) Runtime exception
  • (C) Nothing, it will skip unmatched cases
  • (D) The switch will repeat the last matched case

D

Dhruva Jagannath • 660 Points
Invincible

Q. What kind of fields can enums have?

  • (A) Only final fields
  • (B) Only static fields
  • (C) Any type of field
  • (D) Enums cannot have fields

D

Dhruva Jagannath • 660 Points
Invincible

Q. How is an enum constructor called?

  • (A) By new keyword
  • (B) Automatically by the JVM for each constant
  • (C) Manually by the programmer
  • (D) By reflection

D

Dhruva Jagannath • 660 Points
Invincible

Q. Which of these is NOT true about enums in Java?

  • (A) They can implement interfaces
  • (B) They can extend classes
  • (C) They can have methods
  • (D) They are final by default

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