Master Java Programming Fundamentals: Quizzes and Practice Questions

Question 1

Which of the following is a non-primitive data type in Java?

Accepted Answer

String

Answer

int

Answer

char

Answer

boolean

Question 2

Which keyword defines a class in Java?

Accepted Answer

class

Answer

define

Answer

struct

Answer

object

Question 3

Which control flow statement repeats a block of code?

Accepted Answer

while

Answer

switch

Answer

if

Answer

break

Question 4

What purpose does a method serve in Java?

Accepted Answer

Encapsulate a specific task

Answer

Define a new data type

Answer

Control program flow

Answer

Handle exceptions

Question 5

What is the difference between checked and unchecked exceptions in Java?

Accepted Answer

Checked exceptions must be handled, while unchecked exceptions do not.

Answer

Unchecked exceptions must be handled, while checked exceptions do not.

Answer

There is no difference.

Answer

Checked exceptions occur at compile time, while unchecked exceptions occur at runtime.

Question 6

What is the `finally` block used for in Java?

Accepted Answer

Execute code regardless of exceptions.

Answer

Handle exceptions within a `try` block.

Answer

Control program flow after exception handling.

Answer

Define custom exception classes.

Question 7

Which keyword is used for inheritance in Java?

Accepted Answer

extends

Answer

inherits

Answer

implements

Answer

uses

Question 8

What is the output of the following Java code snippet?

`String s = "Java Programming";
s = s.toLowerCase();
System.out.println(s);`

Accepted Answer

java programming

Answer

Java Programming

Answer

JAVA PROGRAMMING

Answer

An error, as the toLowerCase() method returns a new string

Question 9

Which operator is used to compare two values for equality in Java?

Accepted Answer

==

Answer

=

Answer

===

Answer

&&

Question 10

What is the purpose of a 'for' loop in Java?

Accepted Answer

To iterate over a sequence of values

Answer

To execute a block of code a specific number of times

Answer

To handle exceptions

Answer

To store data in an array

Question 11

What is the difference between a class and an object in Java?

Accepted Answer

A class is a blueprint, while an object is an instance of that blueprint

Answer

An object is a blueprint, while a class is an instance of that blueprint

Answer

They are the same thing

Answer

A class is a variable, while an object is a value

Question 12

What is the purpose of the 'try-catch' block in Java?

Accepted Answer

To handle potential exceptions

Answer

To prevent exceptions from occurring

Answer

To store error messages

Answer

To ignore exceptions

Question 13

Which of the following is a valid file extension for a Java source file?

Accepted Answer

.java

Answer

.js

Answer

.py

Answer

.c

Question 14

What is the purpose of the 'Scanner' class in Java?

Accepted Answer

To read input from the console

Answer

To write data to a file

Answer

To create new objects

Answer

To handle exceptions

Question 15

In Java, what is the primary purpose of the 'new' keyword?

Accepted Answer

Create a new instance of an object

Answer

Declare a variable that references an object

Answer

Set default values for an object's properties

Answer

Allow access to an object's methods

Question 16

In Java, what is the main purpose of the 'extends' keyword?

Accepted Answer

To establish an inheritance relationship between a subclass and a superclass

Answer

To create a new instance of a class

Answer

To implement an interface in a class

Question 17

When an unhandled exception occurs during the execution of a Java program, what is the anticipated outcome?

Accepted Answer

The program abruptly terminates, displaying an error message related to the exception.

Answer

The program proceeds as if the exception did not occur.

Answer

The program enters an endless loop, repeatedly attempting to handle the unhandled exception.

Answer

The program pauses execution, displays a warning message, and resumes after acknowledging the warning.

Question 18

Which of the following is a valid primitive data type in Java?

Accepted Answer

int

Answer

bool

Answer

float32

Answer

String

Question 19

What is the primary purpose of the 'this' keyword in Java?

Accepted Answer

To refer to the current object

Answer

To access static members

Answer

To cast an object to a subclass

Answer

To create a new object

Question 20

Which of the following control flow statements is used to iterate over the elements of an array?

Accepted Answer

for-each

Answer

if-else

Answer

while

Answer

switch

Question 21

What is the primary purpose of the 'super' keyword in Java?

Accepted Answer

To invoke the constructor of the parent class

Answer

To cast an object to a parent class

Answer

To access the private members of the parent class

Question 22

Consider the following Java code snippet: 
 public class Test { 
 public static void main(String[] args) { 
 int x = 5; 
 x += 3; 
 System.out.println(x); 
 } 
 } 
 What will be the output of this code snippet?

Accepted Answer

8

Answer

5

Answer

10

Answer

3