Free Java MCQ Questions (2025) – Online Quiz and Answers
Free Java MCQ Questions with Answers (2025) | Online Java Quiz
Welcome to the Intense Practice Academy **Java Quiz Online**.
Here you can practice **free Java MCQ questions with detailed answers**, topic-wise quizzes, and interview-based questions.
This Java quiz is perfect for:
✔ Freshers
✔ College students
✔ IT job seekers
✔ Java beginners preparing for placement exams
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Java MCQ Quiz – Start Practicing
What You Will Learn from This Java MCQ Test
• Understanding Java basics
• OOPs concepts and rules
• Data types and operators
• String handling
• Constructors and inheritance
• Exception handling basics
• Java logic-building approach
Top Java MCQ Questions with Answers
Q1. Which of the following is NOT a Java keyword?
a) static
b) new
c) Boolean
d) this
Answer: c) Boolean
Explanation: Boolean is a wrapper class, not a keyword.
Q2. What does JVM stand for?
a) Java Virtual Machine
b) Java Variable Manager
c) Java Value Module
d) Java Version Manager
Answer: a) Java Virtual Machine
Explanation: JVM executes Java bytecode.
Q3. Which OOP concept supports code reusability?
a) Encapsulation
b) Inheritance
c) Abstraction
d) Polymorphism
Answer: b) Inheritance
Explanation: Inheritance allows one class to use properties of another.
Q4. Which method is the entry point of any Java application?
a) start()
b) init()
c) main()
d) run()
Answer: c) main()
Explanation: main() is required to run a Java program.
Q5. Which data type is used to store decimal values?
a) int
b) char
c) float
d) boolean
Answer: float
Explanation: float and double store decimal values.
Q6. What is the default value of an int variable in Java?
a) 1
b) 0
c) null
d) undefined
Answer: b) 0
Explanation: int default value is always zero.
Q7. Which of these is used to create an object in Java?
a) this
b) new
c) super
d) class
Answer: b) new
Explanation: new keyword allocates memory for an object.
Q8. Which package contains the Scanner class?
a) java.io
b) java.util
c) java.text
d) java.lang
Answer: b) java.util
Explanation: Scanner is inside java.util package.
Q9. Which operator is used for comparing two values?
a) =
b) ==
c) ===
d) :=
Answer: b) ==
Explanation: == checks equality between two values.
Q10. Which is not an OOP concept in Java?
a) Inheritance
b) Compilation
c) Polymorphism
d) Encapsulation
Answer: b) Compilation
Explanation: Compilation is not an OOP concept.
Java Interview Questions and Answers (Important)
1. What is the difference between JDK, JRE, and JVM?
JDK is used for developing Java applications.
JRE provides the environment to run Java programs.
JVM executes Java bytecode.
2. What is Object-Oriented Programming (OOP)?
OOP is a programming model based on classes and objects. It includes concepts like inheritance, polymorphism, encapsulation, and abstraction.
3. What is the difference between == and equals()?
== compares memory addresses or references.
equals() compares the actual content of objects.
4. What is a constructor in Java?
A constructor is a special method that is called when an object is created. It has no return type and the same name as the class.
5. What is method overloading?
Method overloading means defining multiple methods with the same name but different parameters.
6. What is method overriding?
Method overriding occurs when a subclass provides its own implementation of a method already defined in the parent class.
7. What is an interface in Java?
An interface is a blueprint of a class. It contains abstract methods and constants.
8. What is an abstract class?
An abstract class cannot be instantiated and can contain both abstract and non-abstract methods.
9. What is the difference between String, StringBuilder, and StringBuffer?
String is immutable.
StringBuilder is mutable and faster.
StringBuffer is mutable and thread-safe.
10. What is a package in Java?
A package is a group of related classes and interfaces. Example: java.util, java.io.
Java Quiz – Frequently Asked Questions (FAQ)
Q1. Is this Java quiz free?
Yes, all Java MCQ questions on this page are completely free to practice.
Q2. Can I use this quiz for interview preparation?
Yes, these Java questions are useful for college exams, freshers, and placement interviews.
Q3. Do I need to register to attend the quiz?
No registration is required. You can directly start the quiz.
Q4. How many Java MCQs are available?
There are more than 100 Java MCQs with answers, and new questions are added regularly.
Q5. Is this Java quiz suitable for beginners?
Yes, the quiz starts from basic-level questions and gradually moves to intermediate difficulty.
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