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1 Hour

Mid - Level

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1 Hr

Mid - Level

450+ Certified

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/50

Java Exam

1 / 50

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

A) Error

B) null

C) 0

D) Exception

2 / 50

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

A) The program crashes

B) It runs twice

C) It throws an IllegalThreadStateException

D) The second call is ignored

3 / 50

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

A) Prevents object modification

B) None of the above

C) Prevents serialization of an object

D) Prevents garbage collection of an object

4 / 50

4) 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

5 / 50

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

A) Error

B) Undefined

C) false

D) true

6 / 50

6) Number of primitive data types in Java are?

A) 8

B) 9

C) 7

D) 6

7 / 50

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

A) 3.33

B) 3.0

C) 3.333

D) 3

8 / 50

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

A) Runnable

B) Thread

C) Math

D) Object

9 / 50

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

A) 0

B) 2

C) 3

D) 1

10 / 50

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

A) FileReader

B) Scanner

C) BufferedReader

D) FileInputStream

11 / 50

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

A) ArithmeticException

B) ClassNotFoundException

C) NullPointerException

D) ArrayIndexOutOfBoundsException

12 / 50

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

A) start()

B) run()

C) init()

D) execute()

13 / 50

13) What is the purpose of the transient keyword?

A) To exclude variables from serialization

B) To make variables final

C) To increase variable visibility

D) To make variables thread-safe

14 / 50

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

A) 4 bytes

B) 8 bytes

C) 2 bytes

D) 16 bytes

15 / 50

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

A) Map

B) Iterable

C) Collection

D) Set

16 / 50

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

A) int

B) long

C) void

D) String

17 / 50

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

A) 3

B) 3.33

C) 3.0

D) 3.03

18 / 50

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

A) java.lang

B) java.util

C) java.math

D) java.io

19 / 50

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

A) To perform casting

B) To implement anonymous methods

C) To create constructors

D) To define constants

20 / 50

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

A) null

B) false

C) 0

D) true

21 / 50

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

A) pop()

B) remove()

C) clear()

D) delete()

22 / 50

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

A) 1variable

B) _variable

C) $variable

D) variableName

23 / 50

23) What type of inheritance is allowed in Java?

A) Multiple inheritance

B) Single inheritance

C) Both A and C

D) Multilevel inheritance

24 / 50

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

A) Both A and B

B) Refers to the parent class instance

C) Cannot be used inside a constructor

D) Refers to the current class instance

25 / 50

25) 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

26 / 50

26) 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 Runnable(); t.start();

C) Thread t = new Runnable();

D) Thread t = new Thread();

27 / 50

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

A) Both a and b

B) Cloneable

C) Serializable

D) Runnable

28 / 50

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

A) Throwable

B) Error

C) RuntimeException

D) Object

29 / 50

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

A) compareTo()

B) equals()

C) ==

D) All of the above

30 / 50

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

A) 32-bit

B) 16-bit

C) 64-bit

D) 8-bit

31 / 50

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

A) Retrieves the value from the Optional

B) Replaces the value in the Optional

C) Removes the value from the Optional

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

32 / 50

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

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

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

C) Neither releases the lock

D) Both release the lock

33 / 50

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

A) O(n)

B) O(n^2)

C) O(1)

D) O(log n)

34 / 50

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

A) Copies the value of one object into another

B) Creates a copy of the object

C) Both A and C

D) Creates a shallow copy of the object

35 / 50

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

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

B) Both compare values

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

D) Both compare references

36 / 50

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

A) compare()

B) equals()

C) equalsIgnoreCase()

D) compareTo()

37 / 50

37) 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) const int x = 10;

D) Both B and C

38 / 50

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

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

B) All of the above

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

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

39 / 50

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

A) 64 bits

B) 32 bits

C) 8 bits

D) 16 bits

40 / 50

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

A) object = Class.new();

B) Class object = new Class();

C) new Class object();

D) object = new Class();

41 / 50

41) 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

42 / 50

42) Which collection class does not allow duplicate elements?

A) LinkedList

B) HashSet

C) ArrayList

D) Stack

43 / 50

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

A) Hashtable

B) ArrayList

C) HashMap

D) TreeSet

44 / 50

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

A) 32Java

B) Java32

C) Java5

D) 5Java

45 / 50

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

A) The program continues

B) The program ignores the exception

C) The program terminates abruptly

D) None of the above

46 / 50

46) What is the key benefit of using Streams?

A) Better synchronization of threads

B) Improved data storage

C) Parallel execution of operations

D) Easier exception handling

47 / 50

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

A) Java exceptions do not support inheritance

B) Java exceptions can be either checked or unchecked

C) Java exceptions cannot be thrown explicitly

D) Java exceptions must always be caught

48 / 50

48) 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.

49 / 50

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

A) stop

B) continue

C) break

D) exit

50 / 50

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

A) Date

B) Calendar

C) LocalDate

D) All of the above

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Benefits of Enrolling in Java Exam

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Target Audience

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Course Objectives

➤ Can understand the basics concepts and principles
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➤ Earn a recognized assessment of your Java expertise
➤ Can identify and fix common errors
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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

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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