Java Quiz ( Beginner ) - All Questions

This beginner-level Java quiz is perfect for learners who are new to Java programming. It covers Java basics such as syntax, data types, variables, operators, control statements, OOP fundamentals, and core concepts commonly asked in entry-level exams and interviews.

Question 1: What is Java?

An operating system
A programming language
A database
A web browser

Explanation: Java is a high-level programming language.

Question 2: Who developed Java?

Google
Sun Microsystems
Microsoft
IBM

Explanation: Java was developed by Sun Microsystems.

Question 3: Which file extension is used for Java source files?

.class
.java
.jar
.js

Explanation: Java source files use the .java extension.

Question 4: Which component executes Java bytecode?

JDK
JRE
JVM
Compiler

Explanation: JVM executes Java bytecode.

Question 5: What does JDK stand for?

Java Deployment Kit
Java Development Kit
Java Design Kit
Java Debug Kit

Explanation: JDK stands for Java Development Kit.

Question 6: Which keyword is used to define a class in Java?

define
struct
class
object

Explanation: The class keyword is used to define a class.

Question 7: Which method is the entry point of a Java program?

start()
run()
main()
init()

Explanation: main() is the entry point of a Java program.

Question 8: Which keyword is used to create an object?

create
object
new
alloc

Explanation: Objects are created using the new keyword.

Question 9: Which data type is used to store whole numbers?

float
double
int
boolean

Explanation: int stores whole numbers.

Question 10: Which data type stores true or false values?

int
char
boolean
String

Explanation: boolean stores true or false values.

Question 11: Which data type stores a single character?

String
char
int
boolean

Explanation: char stores a single character.

Question 12: Which keyword is used for inheritance?

inherits
extends
implements
super

Explanation: extends is used for class inheritance.

Question 13: Which concept allows code reuse?

Encapsulation
Inheritance
Abstraction
Compilation

Explanation: Inheritance allows code reuse.

Question 14: Which keyword is used to implement an interface?

extends
implements
interface
inherits

Explanation: implements is used to implement interfaces.

Question 15: Which loop executes at least once?

for
while
do-while
foreach

Explanation: do-while executes at least once.

Question 16: Which loop is best when number of iterations is known?

while
do-while
for
if

Explanation: for loop is best when iterations are known.

Question 17: Which statement is used for decision making?

for
switch
break
continue

Explanation: switch is used for decision making.

Question 18: Which keyword exits a loop immediately?

exit
stop
break
continue

Explanation: break exits the loop.

Question 19: Which keyword skips the current loop iteration?

skip
continue
break
pass

Explanation: continue skips the current iteration.

Question 20: Which operator checks equality?

Explanation: == checks equality.

Question 21: Which operator performs logical AND?

Explanation: && is logical AND.

Question 22: Which keyword refers to the current object?

self
current
this
super

Explanation: this refers to the current object.

Question 23: Which keyword refers to the parent class?

this
base
parent
super

Explanation: super refers to the parent class.

Question 24: Which keyword prevents inheritance?

static
final
private
const

Explanation: final prevents inheritance.

Question 25: Which keyword prevents method overriding?

abstract
static
final
private

Explanation: final methods cannot be overridden.

Question 26: Which keyword is used to define constants?

static
const
final
immutable

Explanation: final is used to define constants.

Question 27: Which OOP concept hides internal details?

Inheritance
Encapsulation
Polymorphism
Compilation

Explanation: Encapsulation hides internal details.

Question 28: Which feature allows multiple methods with same name?

Inheritance
Overloading
Overriding
Encapsulation

Explanation: Overloading allows same method name.

Question 29: Which feature allows redefining parent methods?

Overloading
Overriding
Encapsulation
Abstraction

Explanation: Overriding redefines parent methods.

Question 30: Which keyword defines an abstract class?

interface
virtual
abstract
extends

Explanation: abstract defines an abstract class.

Question 31: Can we create an object of an abstract class?

Yes
No
Only once
Only in main

Explanation: Abstract classes cannot be instantiated.

Question 32: Which keyword defines an interface?

class
abstract
interface
implements

Explanation: interface keyword defines an interface.

Question 33: Which package is automatically imported?

java.util
java.io
java.lang
java.net

Explanation: java.lang is imported by default.

Question 34: Which class is the parent of all classes?

Main
Base
Object
Class

Explanation: Object is the root class.

Question 35: Which keyword is used to handle exceptions?

error
catch
throw
exception

Explanation: catch handles exceptions.

Question 36: Which block always executes?

try
catch
throw
finally

Explanation: finally always executes.

Question 37: Which keyword throws an exception explicitly?

throws
throw
catch
final

Explanation: throw explicitly throws exceptions.

Question 38: Which keyword declares exceptions?

throw
throws
catch
exception

Explanation: throws declares exceptions.

Question 39: Which feature makes Java platform-independent?

Compiler
JVM
JDK
JRE

Explanation: JVM enables platform independence.

Question 40: Which memory area stores objects?

Stack
Heap
Method area
Register

Explanation: Objects are stored in heap memory.

Question 41: Which memory area stores local variables?

Heap
Stack
Method area
Class loader

Explanation: Local variables are stored in stack.

Question 42: Which mechanism frees unused memory automatically?

Destructor
Garbage Collection
Manual delete
Heap cleanup

Explanation: Garbage Collection frees unused memory.

Question 43: Which method requests garbage collection?

gc()
finalize()
System.gc()
clean()

Explanation: System.gc() requests garbage collection.

Question 44: Which collection does not allow duplicates?

List
ArrayList
Set
Map

Explanation: Set does not allow duplicate values.

Question 45: Which collection allows duplicate elements?

Set
Map
List
None

Explanation: List allows duplicate elements.

Question 46: Which keyword is used to create immutable variables?

static
private
final
const

Explanation: final creates immutable variables.

Question 47: Which Java feature supports object-oriented programming?

Pointers
Classes and objects
Macros
Structures

Explanation: Java uses classes and objects.

Question 48: What is the main goal of learning Java?

UI design
Build scalable applications
Database management
Network setup

Explanation: Java is used to build scalable applications.

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Java Quiz ( Beginner )

Questions

~15

Minutes

Min Limit