Java Language Fundamentals Questions with Answers | Programming Q&A | Page 3

Java Language Fundamentals questions with answers are essential for mastering the building blocks of Java programming. This includes topics like data types, operators, arrays, and control structures. Practicing programming questions and answers with explanations enables students to improve coding accuracy and logical reasoning. These Java MCQs are widely asked in technical interviews and online coding assessments conducted by companies like Infosys, TCS, and Capgemini. Reviewing Java aptitude questions with solutions PDF helps solidify your understanding of syntax and execution flow for placement and certification exams.

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Q21

What is the default value of a boolean variable in Java?

A true
B Explanation: The default value of a boolean variable is false.
C 0
D null

Answer: Option B

Explanation: The default value of a boolean variable is false.

Q22

Which of the following is a valid main method declaration?

A public static void main(String args)
B Explanation: This is the correct syntax and order for the main method.
C void main(String[] args)
D public void static main(String args[])

Answer: Option B

Explanation: This is the correct syntax and order for the main method.

Q23

Which keyword is used to declare a constant in Java?

A static
B constant
C Explanation: The final keyword prevents modification of a variable.
D immutable

Answer: Option C

Explanation: The final keyword prevents modification of a variable.

Q24

Which of the following is a valid Java comment?

A ## Comment
B
C Explanation: // is used for single-line comments in Java.
D ** Comment **

Answer: Option C

Explanation: // is used for single-line comments in Java.

Q25

What is the default value of an object reference variable?

A 0
B empty
C Explanation: Reference variables default to null.
D undefined

Answer: Option C

Explanation: Reference variables default to null.

Q26

Which keyword is used to create an object in Java?

A create
B Explanation: The new keyword allocates memory for an object.
C object
D instance

Answer: Option B

Explanation: The new keyword allocates memory for an object.

Q27

Which operator is used for equality comparison in Java?

A =
B Explanation: == compares primitive values for equality.
C !=
D equals

Answer: Option B

Explanation: == compares primitive values for equality.

Q28

Which of the following is NOT an access modifier in Java?

A public
B protected
C private
D Explanation: Java does not support the internal access modifier.

Answer: Option D

Explanation: Java does not support the internal access modifier.

Q29

Which package is automatically imported in every Java program?

A java.util
B java.io
C Explanation: The java.lang package is imported by default.
D java.net

Answer: Option C

Explanation: The java.lang package is imported by default.

Q30

Which keyword is used for inheritance in Java?

A implements
B inherits
C Explanation: The extends keyword allows a class to inherit another class.
D super

Answer: Option C

Explanation: The extends keyword allows a class to inherit another class.

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