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Java Quizzes, Questions & Answers

Recent Java Quizzes

Some Important Over Java Basics Questions

Questions: 6 | Attempts: 132 | Last updated: May 6, 2025

Sample Question
Java is

A island

An object oriented programming language

A binary language

An assembler

Computer Science Java Quiz

Questions: 23 | Attempts: 1624 | Last updated: Jan 17, 2025

Sample Question
Refer to the following variable declaration for this question: int[] numbers = {1,2,3,4,5,6,7,8,9,10}; Which of the following is a valid conclusion based on this variable declaration?

Int[8] numbers = 9;

Numbers[2] = 2;

Int[9] numbers = 10;

Numbers[5] = 6;

Both a and c

Advanced Java Quiz

Questions: 22 | Attempts: 12409 | Last updated: Sep 1, 2025

Sample Question
Which method in the HttpServlet class services the HTTP POST request? (Select one)

DoPost(ServletRequest, ServletResponse)

DoPOST(ServletRequest, ServletResponse)

ServicePost(HttpServletRequest, HttpServletResponse)

DoPost(HttpServletRequest, HttpServletResponse)

Questions: 30 | Attempts: 230 | Last updated: Jul 12, 2025

Sample Question
Consider the following code: public class TestOne { public static void main(String args[]) { byte x = 3; byte y = 5; System.out.print((y%x) + ", "); System.out.println(y == ((y/x) *x +(y%x))); } } Which of the following gives the valid output for above?

Prints 2, false

Prints: 1, true

Prints: 2, true

Prints: 1, true

Java Core Mock Test 4

Questions: 40 | Attempts: 96 | Last updated: Oct 7, 2025

Sample Question
Under which of the following scenarios a checked exception is thrown? (Choose 2)

A. Given username and password is checked with database and found invalid

B. 5th element of an array is accessed, whose size is 3

C. length() method is called on a String object, that is assigned to null

D. A file that actually does not exist, is opened for reading

E. An attempt to connect to the database is made but failed.

Core Java Test 4

Questions: 40 | Attempts: 656 | Last updated: Sep 7, 2025

Sample Question
Which statements are true about comparing two instances of the same class,given that the equals() and hashCode() methods have been properly overridden? (choose all that apply)

If the equals()methood returns true,the hashCode() comparison==might return false.

If the equals()methood returns false,the hashCode() comparison==might return true.

If the hashCode() comparison==returns true,the equals() method must return true

If the hashCode() comparison==returns true,the equals() method might return true

If the hashCode() comparison!=returns true,the equals() method must return true

Java Core Mock Test-3

Questions: 35 | Attempts: 144 | Last updated: Aug 6, 2025

Sample Question
Which access modifier have almost identical behaviour as that of default.?

Protected

Public

Private

Both public and protected

Core Java Hardest Test: Trivia Quiz!

Questions: 40 | Attempts: 148 | Last updated: Mar 21, 2025

Sample Question
Choose the possible constructor arguments of the Float wrapper class.

Float

Double

String

Int

Byte

Core Java Mock Test-3

Questions: 45 | Attempts: 684 | Last updated: Sep 5, 2025

Sample Question
Consider the following code: 1. class Test { 2. public static void main(String args[]) { 3. double d = 12.3; 4. Dec dec = new Dec(); 5. dec.dec(d); 6. System.out.println(d); 7. } 8. } 9. class Dec{ 10. public void dec(double d) { d = d - 2.0d; } 11. } Which of the following gives the correct value printed at line 6?

Prints: 12.3

Prints: -2.0

Prints: 10.3

Prints: 0.0

Java Programming Competition I

Questions: 50 | Attempts: 1759 | Last updated: Jul 4, 2025

Sample Question
What is the range of an int data type in Java?

–2^15 to 2^15 – 1

0 to 2^15

–2^31 to 2^31 – 1

0 to 2^31

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