The document presents a compilation of the top 50 multiple choice questions (MCQs) focusing on various aspects of Java programming, aimed at helping developers and students prepare for exams and interviews. It covers topics such as object-oriented programming, syntax, control structures, and core Java concepts, providing both questions and answers for practice. Additionally, the document suggests study strategies like solving coding problems and reviewing past interview questions to improve proficiency in Java.

1. Top 50 Java MCQ Questions
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09 Jul 2024
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Java Preparation
Java MCQs are a good way to practice and become a master in Java programming. Java is a high-level object-oriented
programming language. It is easy to understand and used to develop programs. For the preparation of the Java
Interview or exam, Java developers and students should go through the multiple choice questions and answers of
Java once in a lifetime
A.Object-oriented
B.Platform-independent
C.Compiled
D.Interpreted language
Read More: Top 12 Features of Java
So, In this Java tutorial,I brought some multiple choice questions and answers on Java programming language only
for you It will help you to prepare well for your exams or interviews. So let's explore the top 50 Java MCQ questions and
answers. Let's see one by one
1. Which of these is not a feature of Java?
Answer: C Compiled

2. 7. What is multithreaded programming?
5. In Java, how should class names be written?
6. How do I comment on a block of code in Java?
3. What is the purpose of the PATH environment variable in Java?
2. Which component of Java is responsible for running the compiled Java
bytecode?
4. Which feature of Java makes it possible to run a Java program on different
platforms?
A.JDK
B.JVM
C.JRE
D.JIT
A.camelCase
B.snake_case
C.PascalCase
D.kebab-case
A./*comment*/
B.//comment
C.!--comment--
D.%comment
A.Object-Oriented
B.Platform-Independent
C.Syntax
D.Memory Management
A.To locate Java libraries
B.To store Java bytecode
C. To Locate the exe files (.exe)
D.To optimize Java code
A. It’s a process in which two different processes run simultaneously
B. It’s a process in which two or more parts of the same process run simultaneously
Answer: B.JVM
Answer: C.PascalCase
Answer: A./*comment*/
Answer: B.Platform-Independent
Answer: C. To Locate the exe files (.exe)

3. A.10
A.true
B.false
C.0
D.null
A.final
B.static
C.const
D.immutable
A.7
B.7.9
C.8
D.Syntax Error
A.-32768 to 32767
B.-128 to 127
C.-2147483648 to 2147483647
D.0 to 65535
C.It’s a process in which many different process are able to access the same information
D. It’s a process in which a single process can access information from many sources
Answer: A.7
Answer: A.final
Answer: B.false
Answer: A.-32768 to 32767
Answer: B. Multithreaded programming is a process in which two or more parts of the same
process run simultaneously.
9. What is the result of this operation in Java?
11. What is the range of the short data type in Java?
8. What is the default value of a boolean variable in Java?
12. What will be the output of the following code snippet?
10. Which keyword is used to define a constant variable in Java?
(int)(7.9)
int a = 10; int b = 20;
System.out.println(a + b);

4. B.20
C.30
D.Erro
r
A.true
B.false
C.Error
D.null
A.Greater
B.Lesser
C.Error
D.No output
A. Java is object-oriented and interpreted
B. Java is efficient and faster than C
C. Java is the choice of everyone.
D. Java is not robust.
Answer: C.30
Answer: B.false
Answer: A.Greater
Answer: A. Java is object-oriented and interpreted
13. Identify the output.
16. Evaluate this pseudocode.
15. What is the output of this pseudocode?
14. Which one of the following is true for Java
SET x = 10 IF x > 5
THEN PRINT
"Greater"
ELSE PRINT "Lesser"
boolean isJavaFun = true;
SET a = 3 SET b = 4 PRINT a * b
System.out.println(!isJavaFun);

5. A.Even
B.Odd
C.Error
D.No output
A.Infinite loop
B.Syntax error
C.No error
D.Prints 0
A.7
B.12
C.Error.
D.None of the above
A.Array index out of bounds
B.Incorrect array declaration
C.No error
D.Syntax error
Answer: B.12
17. Determine the output.
Answer: A.Even
18. Identify the error in this code.
Answer:C.No error
20. Which control structure is used to execute a block of code multiple times?
Answer: A.Array index out of bounds
19. Spot the mistake in this code snippet.
int[] nums = new int[2];
nums[0] = 1; nums[1] = 2;
nums[2] = 3;
int i = 0; while(i < 5) { i++; } System.out.println(i);
SET num = 4 IF num MOD 2 = 0 THEN PRINT "Even" ELSE PRINT "Odd"

6. A.break
B.continue
C.exit
D.stop
A.True
B.False
C.Error
D.No Output
A.if
B.switch-case
C.for
D.try-catch
A. To pause the execution
B. To terminate the case block
C. To skip to the next case
D. To repeat the case block
A.Syntax only
B. The 'do-while' loop executes at least once
C.Execution speed
D.No difference
Answer: C.for
21. What will be the output of the following code snippet.
Answer: B.False
22. In a 'switch-case' statement, what is the role of the 'break' keyword?
Answer: A.break
25. What will the following loop print?
Answer: B.To terminate the case block
23. What is the difference between 'while' and 'do-while' loops in Java?
Answer:B. The 'do-while' loop executes at least once
24. Which keyword is used to exit a loop prematurely in Java?
for(int i = 0; i < 4; i++)
{
if(false){ System.out.println("True"); } else{ System.out.println("False"); }

7. A.0 1 2
B.1 2 3
C.0 1 2
3
D.None
A.1 2 3
B.2 3 4
C.1 2 3
4 D.1
A.5 4 3 2 1
B.5
C.1 2 3 4 5
D.None
Answer: A.0 1 2
26. What is the output of this code?
Answer: A.1 2 3
27. What will this pseudocode output?
Answer: A.5 4 3 2 1
28. Analyze this pseudocode.
SET count = 5
DO PRINT
count
COUNTDOWN
count
SET num = 0
WHILE num <= 5
IF num MOD 2 = 0
THEN PRINT num END
IF INCREMENT num
System.out.println(i);
}
int x = 1;
while(x < 4)
{
System.out.println(x);
x++;
}

8. A.0 2 4
B.0 1 2 3 4 5
C.2 4
D.0 2 4 6
A.Loop never terminates
B.Counter not incremented
C.No error
D.Print statement incorrect
A.Syntax error outside the loop
B.No error
C.Variable i not accessible outside loop
D.Infinite loop
Answer: A.0 2 4
29. Identify the error.
Answer:C.No error
31. Find the error in this code.
Answer: C.Variable i not accessible outside the loop
30. Spot the mistake.
for(int i=0; i<=5; i++)
{
System.out.println(i);
}
System.out.println(i);
int num = 1;
do{
System.out.println(num);
num++;
} while(num <= 3);
System.out.println(num);
int counter = 0;
while(counter < 5)
{
counter++;
}
System.out.println("Count: " + counter);

9. A.0
B.null
C.1
D.-1
A.arr[2]
B.arr[3]
C.arr(2)
D.arr(3)
A.Scanner
B.InputStream
C.BufferedReader
D.FileReader
A.Infinite loop
B.Syntax error
C.Prints wrong values
D.No error
A.Faster input reading
B.Input from file only
C.Different data types
D.Graphical interface
A.Compile-time error
B.Runtime error: ArrayIndexOutOfBoundsException
C.No error
D.Logical error
Answer: A.0
34. What does 'BufferedReader' in Java provide that 'Scanner' does not?
Answer:A.arr[2]
36. How do you access the third element in an array named 'arr'?
Answer:D.No error
32. Which class is commonly used for simple keyboard input in Java?
Answer: A.Scanner
33. In Java, what is the default value of an array of integers?
Answer: A.Faster input reading
35. How do you access the third element in an array named 'arr'?
Answer: B.Runtime error: ArrayIndexOutOfBoundsException

10. 41. What does this Java code do?
40. What will the following code output?
37. What is the purpose of the 'length' attribute in a Java array?
38. Which of these is not a valid way to instantiate an array in Java?
39. In a multi-dimensional array, how do you access the element in the second row
and third column of an array named 'matrix'?
A.1 2 3
B.123
C.Error
D.None
A.matrix[1]
[2]
B.matrix[2]
[3]
C.matrix[2]
[2]
D.matrix[1]
[3]
A.int[] arr = new int[5];
B.int arr[] = new int[5];
C.int arr[] = {1, 2, 3, 4,
5}; D.int arr[] = int[5];
A. To determine the size of the array
B. To modify the size of the array
C. To sort the array
D. To initialize the array
Answer: A.1 2 3
Answer:A.matrix[1][2]
Answer:int arr[] = int[5];
Answer: A.To determine the size of the array
int[] arr = {1, 2, 3};
for(int num : arr)
{
System.out.println(num);
}
int[][] arr = {{1, 2}, {3, 4}};
for(int i = 0; i < arr.length; i++)
{

11. A.4
B.5
C.6
D.Erro
r
A.0
B.10
C.Error
D.None
A.1 2 3
B.123
C.Error
D.None
A.Prints a 2D array in matrix form
B.Prints only the first row of the array
C.Prints the sum of the array elements
D.Gives an error
Answer: C.6
43. Analyze this code.
Answer: B.10
44. What will this pseudocode output?
Answer: A.Prints a 2D array in matrix form
42. What will be the result of executing this code snippet?
int[] nums = new int[3];
nums[1] = 10;
int x = nums[1] + nums[0];
System.out.println(x);
for(int j = 0; j < arr[i].length; j++)
{
System.out.print(arr[i][j] + " ");
}
System.out.println(); }
String[] names = {"Java", "Python", "C++"};
System.out.println(names[1].length());
SET arr = [1, 2, 3] FOR EACH num IN arr PRINT num

12. Answer: B.2
47. Identify the issue in this code snippet.
Answer: A.60
46. What will be the result of this pseudocode?
Answer: A.1 2 3
45. Determine the output of this pseudocode.
Answer: A.Out-of-bounds array access
48. Spot the mistake in this code.
A.1
B.2
C.3
D.
4
A.60
B.1020 30
C.Error
D.None
A.Out of bounds array access
B.No issue
C.Syntax error
D.Logic error
int[] numbers = new int[5];
for(int i = 0;
i <= numbers.length;i++) {
SET matrix = [[1, 2], [3, 4]]
PRINT matrix[0][1]
System.out.println(numbers[i]);
}
String[] names = {"Java", "Python", "C"};
for(int i = 0;
i < names.length;
i++) {
SET arr = [10, 20, 30] SET sum = 0 FOR i = 0 TO LENGTH(arr) - 1 INCREMENT sum BY arr[i] PRINT sum

13. A.public
B.private
A.static
B.final
C. abstract
D.sealed
A.Negative array size
B.Syntax error
C.No error
D.Logic error
A.Prints incorrect lengths
B.No error
C.Syntax error
D.Logic error
A.Prints incorrect value
B.No error
C.Syntax error
D.Missing initialization for matrix[1][1]
Answer: B. final
52. Which of the following is not a Java access modifier?
Answer:B.No error
49. Find the error in this Java code.
Answer: A.Negative array size
51. Which keyword is used to prevent a class from being subclassed in Java?
Answer: D.Missing initialization for matrix[1][1]
50. Identify the flaw in this Java code.
char[] chars = new char[-1];
int[][] matrix = new int[2][2];
matrix[0][0] = 1; matrix[0][1] = 2;
matrix[1][0] = 3;
System.out.println(matrix[1][1]);
System.out.println(names[i].length());
}

14. A.star t()
B. run()
C. init()
D.execute()
C. protected
D.package
A.length()
B.size()
C.getSize()
D.getLength()
A.0
B.null
C. Undefined
D.Compiler error
A.NullPointerException
B.ClassCastException
C. IOException
D.ArithmeticException
A. InterruptedException
B.IOException
C.SQLException
D.ArithmeticException
Answer: B. run()
55. Which of the following is a checked exception in Java?
Answer: A. length()
Answer: D. package
53. Which exception is thrown when a thread is waiting, sleeping, or otherwise
occupied, and the thread is interrupted?
Answer: C. IOException
56. What is the default value of a local variable in Java?
Answer: D. Compiler error.
57. Which method is used to find the length of a string in Java?
Answer: A. InterruptedException
54. Which method must be implemented by all threads in Java?

15. 58. Which operator is used to concatenate two strings in Java?
59. Which of the following is a superclass of every class in Java?
60. Which of the following methods can be used to start a new thread in Java?
A.+
B. &
C.&&
D.
++
A. start()
B.run()
C.execute()
D. init()
A.Object
B.Class
C. Interface
D.Super
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Java Multiple Choice Questions (MCQs) and answers are an important resource for testing Java programming
expertise. We covered various Java concepts, including multithreading and memory management which will help you in
interviews and exams. For a more understanding of Java refer to our Java Certification Program.
Answer: A. +
Answer: A. Object
Answer: A. start()
Conclusion:

16. To effectively prepare for Java MCQ questions:
James Gosling is considered the father of Java.
JAVA stands for Just Another Virtual Accelerator.
Top 50 Java 8 Interview Questions and Answers
Java Multithreading Interview Questions and Answers 2024
It functions as a virtual machine, translating Java bytecode into machine language.
1. Review Core Concepts: Focus on key topics such as OOP, collections, exceptions, multithreading, and Java 8+
features.
2. Practice Coding: Solve coding problems on platforms like LeetCode or HackerRank to reinforce your
understanding.
3. Use Online Resources: Take advantage of Java quizzes and MCQ practice tests available online.
4. Study Past Papers: Go through previous interview questions to identify common patterns.
5. Read Documentation: Familiarize yourself with Java documentation for detailed explanations and examples.
. Join Study Groups: Engage with peers to discuss concepts and solve problems together.
7. Utilize Flashcards: Create flashcards for quick revision of important concepts and syntax.
By combining these strategies, you'll build a strong foundation and improve your confidence in tackling Java MCQs.
Overlooking Details, Confusing Similar Concepts, Neglecting Syntax, Skipping Basics, Not Practicing Enough,
Ignoring Time Management , Relying on Memory
We should focus on various concepts such as Basic Syntax and Data Types, Operators Control Structures (if-else,
switch, loops), Arrays and Strings, Object-Oriented Programming (OOP), Exception Handling, Collections
Framework, Java Memory Management, Java I/O and NIO
To stand out in a Java interview, consider developing additional skills such as ,Advanced Java Features Spring
Framework, Hibernate, Microservices, Design Patterns, Testing, integration testing, test-driven development (TDD),
FAQs
Q1. Who is the godfather of Java?
Q2. What is Java full form?
Q3. Why is Java called JVM?
Q5. How can I effectively prepare for Java MCQ questions?
Q4. What concepts should I focus on for Java MCQ interviews?
Q7. What additional Java skills can make me stand out in an interview?
Q6. What are some common mistakes to avoid in Java MCQ interviews?
DevOps Tools, and also soft skills