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

A) RuntimeException

B) Error

C) Object

D) Throwable

2 / 50

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

A) Both A and B

B) Refers to the current class instance

C) Refers to the parent class instance

D) Cannot be used inside a constructor

3 / 50

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

A) compareTo()

B) All of the above

C) equals()

D) ==

4 / 50

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

A) Scanner

B) BufferedReader

C) FileReader

D) FileInputStream

5 / 50

5) What is the key benefit of using Streams?

A) Parallel execution of operations

B) Better synchronization of threads

C) Easier exception handling

D) Improved data storage

6 / 50

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

A) static final int x = 10;

B) final static int x = 10;

C) Both B and C

D) const int x = 10;

7 / 50

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

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

B) Thread t = new Thread();

C) Thread t = new Runnable();

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

8 / 50

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

A) 2 bytes

B) 8 bytes

C) 16 bytes

D) 4 bytes

9 / 50

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

A) 0

B) 1

C) 2

D) 3

10 / 50

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

A) 3.0

B) 3.33

C) 3

D) 3.333

11 / 50

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

A) 8-bit

B) 16-bit

C) 32-bit

D) 64-bit

12 / 50

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

A) Iterable

B) Set

C) Collection

D) Map

13 / 50

13) What is the difference between HashMap and Hashtable?

A) Both are identical

B) Hashtable allows null keys, HashMap does not

C) HashMap is thread-safe, Hashtable is not

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

14 / 50

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

A) To perform casting

B) To create constructors

C) To define constants

D) To implement anonymous methods

15 / 50

15) 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

16 / 50

16) What is the purpose of the transient keyword?

A) To make variables final

B) To exclude variables from serialization

C) To increase variable visibility

D) To make variables thread-safe

17 / 50

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

A) Replaces the value in the Optional

B) Retrieves the value from the Optional

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

D) Removes the value from the Optional

18 / 50

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

A) switch statement

B) try-catch block

C) if-else statement

D) exception class

19 / 50

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

A) compareTo()

B) compare()

C) equals()

D) equalsIgnoreCase()

20 / 50

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

A) void

B) String

C) long

D) int

21 / 50

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

A) run()

B) execute()

C) start()

D) init()

22 / 50

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

A) The program terminates abruptly

B) The program continues

C) None of the above

D) The program ignores the exception

23 / 50

23) Which collection class does not allow duplicate elements?

A) LinkedList

B) HashSet

C) ArrayList

D) Stack

24 / 50

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

A) Exception

B) null

C) Error

D) 0

25 / 50

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

A) Error

B) Undefined

C) true

D) false

26 / 50

26) What type of inheritance is allowed in Java?

A) Single inheritance

B) Both A and C

C) Multilevel inheritance

D) Multiple inheritance

27 / 50

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

A) 32 bits

B) 8 bits

C) 64 bits

D) 16 bits

28 / 50

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

A) 32Java

B) Java32

C) 5Java

D) Java5

29 / 50

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

A) O(log n)

B) O(n^2)

C) O(n)

D) O(1)

30 / 50

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

A) false

B) null

C) 0

D) true

31 / 50

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

A) TreeSet

B) HashMap

C) Hashtable

D) ArrayList

32 / 50

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

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

B) It can only be used with classes.

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

D) It can only be used with methods.

33 / 50

33) Number of primitive data types in Java are?

A) 8

B) 6

C) 9

D) 7

34 / 50

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

A) remove()

B) pop()

C) clear()

D) delete()

35 / 50

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

A) It runs twice

B) The program crashes

C) It throws an IllegalThreadStateException

D) The second call is ignored

36 / 50

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

A) Runnable

B) Serializable

C) Both a and b

D) Cloneable

37 / 50

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

A) break

B) exit

C) stop

D) continue

38 / 50

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

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

B) Both release the lock

C) Neither releases the lock

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

39 / 50

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

A) _variable

B) $variable

C) variableName

D) 1variable

40 / 50

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

A) Prevents serialization of an object

B) None of the above

C) Prevents object modification

D) Prevents garbage collection of an object

41 / 50

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

A) Java exceptions cannot be thrown explicitly

B) Java exceptions do not support inheritance

C) Java exceptions must always be caught

D) Java exceptions can be either checked or unchecked

42 / 50

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

A) Creates a shallow copy of the object

B) Creates a copy of the object

C) Copies the value of one object into another

D) Both A and C

43 / 50

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

A) Class object = new Class();

B) new Class object();

C) object = new Class();

D) object = Class.new();

44 / 50

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

A) java.io

B) java.math

C) java.lang

D) java.util

45 / 50

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

A) 3

B) 3.0

C) 3.33

D) 3.03

46 / 50

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

A) Thread

B) Math

C) Object

D) Runnable

47 / 50

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

A) ArithmeticException

B) ArrayIndexOutOfBoundsException

C) ClassNotFoundException

D) NullPointerException

48 / 50

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

A) All of the above

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

C) A constructor can be overloaded

D) A constructor has no return type

49 / 50

49) 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(10);

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

50 / 50

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

A) LocalDate

B) Date

C) Calendar

D) All of the above

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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