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1 Hour

Mid - Level

450+ Students Certified

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1 Hr

Mid - Level

450+ Certified

1000 Rs
Special Offer

/50

Java Exam

1 / 50

1) In which package is the Scanner class located in Java?

A) java.lang

B) java.io

C) java.math

D) java.util

2 / 50

2) Which of the following interfaces does Java’s List interface extend?

A) Set

B) Collection

C) Map

D) Iterable

3 / 50

3) What does the isPresent() method do in Optional?

A) Retrieves the value from the Optional

B) Replaces the value in the Optional

C) Checks if the Optional contains a non-null value

D) Removes the value from the Optional

4 / 50

4) What is the purpose of the ‘clone()’ method in Java?

A) Both A and C

B) Copies the value of one object into another

C) Creates a copy of the object

D) Creates a shallow copy of the object

5 / 50

5) What is the result of the following expression in Java: 10 / 3?

A) 3.333

B) 3.0

C) 3

D) 3.33

6 / 50

6) What is the difference between equals() and ==?

A) == compares values, equals() compares references

B) Both compare references

C) Both compare values

D) equals() compares values, == compares references

7 / 50

7) Which of the following collections is thread-safe in Java?

A) ArrayList

B) HashMap

C) TreeSet

D) Hashtable

8 / 50

8) Which of the following is true about constructors in Java?

A) A constructor can be overloaded

B) A constructor has no return type

C) A constructor name must be the same as the class name

D) All of the above

9 / 50

9) What is the result of the expression 3 + 2 + "Java"?

A) 5Java

B) 32Java

C) Java5

D) Java32

10 / 50

10) What is the size of a char in Java?

A) 8-bit

B) 32-bit

C) 64-bit

D) 16-bit

11 / 50

11) Which of the following is the correct syntax to create an object of a class in Java?

A) object = new Class();

B) Class object = new Class();

C) object = Class.new();

D) new Class object();

12 / 50

12) Which of the following is a marker interface in Java?

A) Serializable

B) Both a and b

C) Cloneable

D) Runnable

13 / 50

13) What is the output of the following code?
int[] arr = new int[5];
System.out.println(arr[0]);

A) Exception

B) 0

C) Error

D) null

14 / 50

14) What is the size of an ‘int’ data type in Java?

A) 32 bits

B) 16 bits

C) 64 bits

D) 8 bits

15 / 50

15) Which method is used to remove an element from the end of a stack in Java?

A) delete()

B) clear()

C) pop()

D) remove()

16 / 50

16) What will be the output of the following code?
System.out.println(10 / 3);

A) 3.03

B) 3

C) 3.33

D) 3.0

17 / 50

17) Which method is used to compare two strings in Java?

A) equalsIgnoreCase()

B) compare()

C) compareTo()

D) equals()

18 / 50

18) Which of the following is the correct way to create a thread in Java?

A) Thread t = new Runnable();

B) Thread t = new Thread(); t.run();

C) Thread t = new Runnable(); t.start();

D) Thread t = new Thread();

19 / 50

19) What is the difference between HashMap and Hashtable?

A) Both are identical

B) HashMap is faster and not thread-safe, Hashtable is slower but thread-safe

C) HashMap is thread-safe, Hashtable is not

D) Hashtable allows null keys, HashMap does not

20 / 50

20) What is the default value of a boolean variable in Java?

A) false

B) null

C) 0

D) true

21 / 50

21) Which of the following statements is used to terminate a loop in Java?

A) continue

B) break

C) stop

D) exit

22 / 50

22) What is the result of the expression 5 > 3 && 2 < 4 in Java?

A) true

B) Undefined

C) Error

D) false

23 / 50

23) Which exception is thrown when an object is used before initialization?

A) ArrayIndexOutOfBoundsException

B) NullPointerException

C) ArithmeticException

D) ClassNotFoundException

24 / 50

24) Which class is used to read input from the console in Java?

A) FileInputStream

B) BufferedReader

C) Scanner

D) FileReader

25 / 50

25) Which of the following is not a valid Java identifier?

A) _variable

B) $variable

C) 1variable

D) variableName

26 / 50

26) Which class provides the method sleep() in Java?

A) Object

B) Thread

C) Runnable

D) Math

27 / 50

27) What is the key benefit of using Streams?

A) Easier exception handling

B) Parallel execution of operations

C) Better synchronization of threads

D) Improved data storage

28 / 50

28) Which method is used to start a thread in Java?

A) start()

B) execute()

C) init()

D) run()

29 / 50

29) What is the size of a float variable in Java?

A) 16 bytes

B) 8 bytes

C) 2 bytes

D) 4 bytes

30 / 50

30) Which of the following statements about Java exceptions is true?

A) Java exceptions can be either checked or unchecked

B) Java exceptions must always be caught

C) Java exceptions do not support inheritance

D) Java exceptions cannot be thrown explicitly

31 / 50

31) Which of the following is the parent class of the Exception class in Java?

A) Object

B) Error

C) Throwable

D) RuntimeException

32 / 50

32) Which of the following classes are used to represent date and time in Java?

A) LocalDate

B) All of the above

C) Date

D) Calendar

33 / 50

33) Number of primitive data types in Java are?

A) 8

B) 7

C) 9

D) 6

34 / 50

34) Which of the following statements is true about the ‘this’ keyword in Java?

A) Both A and B

B) Cannot be used inside a constructor

C) Refers to the parent class instance

D) Refers to the current class instance

35 / 50

35) What is the difference between wait() and sleep() methods?

A) Both release the lock

B) sleep() releases the lock, wait() does not

C) Neither releases the lock

D) wait() releases the lock, sleep() does not

36 / 50

36) Which of the following is used to handle errors in Java?

A) exception class

B) if-else statement

C) switch statement

D) try-catch block

37 / 50

37) Which of the following is true about the final keyword in Java?

A) It can only be used with methods.

B) It can only be used with classes.

C) It can be used with variables, methods, and classes.

D) It can be used only with methods and variables.

38 / 50

38) What happens if a thread’s start() method is called twice?

A) It runs twice

B) It throws an IllegalThreadStateException

C) The program crashes

D) The second call is ignored

39 / 50

39) Which collection class does not allow duplicate elements?

A) LinkedList

B) ArrayList

C) Stack

D) HashSet

40 / 50

40) What is the result of the following operation in Java: 5 % 2?

A) 2

B) 1

C) 0

D) 3

41 / 50

41) Which of the following is the correct declaration of a constant in Java?

A) static final int x = 10;

B) Both B and C

C) const int x = 10;

D) final static int x = 10;

42 / 50

42) What happens when an exception is not caught in Java?

A) The program terminates abruptly

B) None of the above

C) The program ignores the exception

D) The program continues

43 / 50

43) What is the return type of the hashCode() method in Java?

A) int

B) long

C) String

D) void

44 / 50

44) Which of the following is a valid constructor for an ArrayList?

A) All of the above

B) ArrayList<String> list = new ArrayList<String>();

C) ArrayList<String> list = new ArrayList();

D) ArrayList<String> list = new ArrayList(10);

45 / 50

45) Which of the following operators can be used to compare two objects for equality in Java?

A) equals()

B) All of the above

C) ==

D) compareTo()

46 / 50

46) What is the time complexity of retrieving a value from a HashMap?

A) O(n)

B) O(1)

C) O(log n)

D) O(n^2)

47 / 50

47) What is the purpose of the transient keyword?

A) To make variables thread-safe

B) To exclude variables from serialization

C) To make variables final

D) To increase variable visibility

48 / 50

48) What is the purpose of a lambda expression in Java?

A) To create constructors

B) To perform casting

C) To define constants

D) To implement anonymous methods

49 / 50

49) What type of inheritance is allowed in Java?

A) Multilevel inheritance

B) Single inheritance

C) Multiple inheritance

D) Both A and C

50 / 50

50) What is the purpose of the ‘transient’ keyword in Java?

A) Prevents garbage collection of an object

B) None of the above

C) Prevents object modification

D) Prevents serialization of an object

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Benefits of Enrolling in Java Exam

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Target Audience

➤ Students and beginners looking to enhance their Java skills.
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Course Objectives

➤ Can understand the basics concepts and principles
➤ Can identify areas for improvement in your Java skills
➤ Earn a recognized assessment of your Java expertise
➤ Can identify and fix common errors
➤ Earn a completion certificate

Advance Your Skills with Java Exam Online with Certification

1 Hour

Mid - Level

450+ Students Certified

1000 Rs - Special Offer

1 Hr

Mid - Level

450+ Certified

1000 Rs
Special Offer

Process to Earn Certificate

Additional Details (Caution)

Benefits of Enrolling in Java Exam

Target Audience

Course Objectives

About Us

Our Popular Exams

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Advance Your Skills with Java Exam Online with Certification

1 Hour

Mid - Level

450+ Students Certified

1000 Rs - Special Offer

1 Hr

Mid - Level

450+ Certified

1000 Rs Special Offer

Process to Earn Certificate

Additional Details (Caution)

Benefits of Enrolling in Java Exam

Target Audience

Course Objectives

About Us

Our Popular Exams

Quick Links

Social Links

1000 Rs
Special Offer