Java MCQ Questions and Answers for Practice

Java Multiple Choice Questions (MCQs) are essential practice tools for students and exam aspirants to test and enhance their understanding of Java programming concepts.

About Java MCQ Questions

Java MCQs cover a wide range of topics, from basic syntax and data types to advanced concepts like multithreading, exceptions, and collections. These questions are designed to assess your knowledge and application skills in Java programming.

Why Practice Java Objective Questions?

Practicing Java objective questions helps you prepare for exams, interviews, and concept revision. It enhances your problem-solving skills, improves your understanding of core Java concepts, and builds your confidence in tackling real-world programming challenges.

Who Should Use These MCQs?

Students preparing for school or college exams
Competitive exam aspirants
Candidates preparing for interviews

Java MCQ Questions for Practice

1. Which of the following is TRUE?

In java, an instance field declared public generates a compilation error
int is the name of a class available in the package java.lang
Instance variable na mes may only contain letters and digits
A class has always a constructor (possibly automatically supplied by the java compiler).

2. A constructor

must have the same name as the class it is declared within.
is used to create objects.
may be declared private
A, B and C

3. Which of the following may be part of a class definition?

instance variables
instance methods
constructors
all of the above

4. What is different between a Java applet and a Java application?

An application can in general be trusted whereas an applet cant
An applet must be executed in a browser environment
An applet is not able to access the files of the computer it runs on
A, B, and C

5. What is byte code in the context of Java?

The type of code generated by a Java compiler
The type of code generated by a Java Virtual Machine
It is another name for a Java source file
It is the code written within the instance methods of a class

6. What is garbage collection in the context of Java?

The operating system periodically deletes all of the java files available on the system
Any package imported in a program and not used is automatically deleted.
When all references to an object are gone, the memory used by the object is automatically reclaimed
The JVM checks the output of any Java program and deletes anything that doesnt make sense

7. JDK stands for

Java Debugging Kit
Java Developers Kit
None of these
Java Decompilation Kit

8. JVM is a

Debugger
Assembler
Interpreter
Compiler

9. Bytecode is given as input to

JRE
linker
JVM
Assembler

10. Output of Java Compiler is

Non executable code
Executable code

11. Output of Java Compiler is executable

true
false

12. Bytecode is a set of highly optimizable code. True or false

true
false

13. The JVM needs to be implemented for each platform

true
false

14. JVM will differ from platform to platform but still all understand the Same Java Bytecode

true
false

15. The compiler and other java development tools reside in _________ sub-folder.

jre
bin
docs
demo