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Blog Quizzes Java Language MCQs with Answers

Java Language MCQs with Answers

By: Sanjay Prajapat

Last Updated: April 3rd, 2026

Read Time: 30:00 Minutes

1. Top Java MCQs

2. Your Quiz Result

Preparing for your next Java interview? Well, then this Java MCQ list is a go to source for you. It includes the most asked Java multiple choice interview questions. These will help you test your proficiency and skills as well as find the weak areas.

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Top Java MCQs

1. Which of the following keywords is used to define a class ?

A) void
B) class
C) public
D) static

2. What is the entry point for any Java application?

A) start() method
B) init() method
C) main() method
D) run() method

3. Which of the following is not an old data type ?

A) int
B) float
C) String
D) boolean

4. Which of the following can be declared a constant ?

A) const int MY_CONST = 10;
B) final int MY_CONST = 10;
C) static int MY_CONST = 10;
D) #define MY_CONST 10

5. Which access modifier makes a member accessible only within its own class?

A) public
B) protected
C) default (no modifier)
D) private

6. Why is super keyword used ?

A) To call a method of the current class.
B) To refer to the superclass of a subclass.
C) To define a static method.
D) To create an instance of a class.

7. Which of the following concepts is not part of Object-Oriented Programming (OOP) ?

A) Encapsulation
B) Inheritance
C) Polymorphism
D) Procedural Programming

8. Which of the following keywords will you use to implement an interface ?

A) extends
B) implements
C) uses
D) inherits

9. What is the default value of a boolean variable?

A) true
B) 0
C) false
D) null

10. Which of the following statements is true in terms of arrays?

A) Arrays can store elements of multiple data types.
B) Array size can be changed after declaration.
C) Arrays are objects .
D) Array index starts from 1.

11. Which of the following is correct about method overloading?

A) It can define many methods with the same name and different return types.
B) It can define many methods with the same name as well as a parameter list.
C) It can define many methods with the same name and multiple parameter lists.
D) None of Above.

12. Which of the following is used for compile-time polymorphism?

A) Method Overriding
B) Method Overloading
C) Inheritance
D) Abstraction

13. What is the correct way to create an object of a class MyClass?

A) MyClass obj;
B) new MyClass obj;
C) MyClass obj = new MyClass();
D) object MyClass = new obj();

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

A) 3.33
B) 3
C) 3.0
D) Error

15. Which of the following is a valid comment ?

A) // This is a comment
B) + This is a comment
C) # This is a comment
D) /* This is a comment

16. What is the purpose of the static keyword when applied to a method ?

A) It makes the method abstract, requiring implementation by subclasses.
B) It means the method can be accessed without creating an object of the class.
C) It prevents the method from being overridden by subclasses.
D) It makes the method accessible only within the same package.

17. Which of the following is true about constructors ?

A) Constructors should have a return type.
B) Constructors can be inherited by subclasses.
C) A class can have multiple constructors.
D) Constructors are called automatically when an object is garbage collected.

18. What is the concept of 'Encapsulation' ?

A) The feature of an object that can take on many forms.
B) The method of creating new classes with the help of existing ones.
C) Wrapping methods and data, which operate on the information into a particular unit.
D) None of Above.

19. Which exception is thrown when an attempt is made to divide by zero?

A) IOException
B) NullPointerException
C) ArithmeticException
D) ArrayIndexOutOfBoundsException

20. Which keyword is used for exception handling to define a block of code to be executed regardless of whether an exception occurred?

A) catch
B) try
C) throw
D) finally

21. What is the difference between == and .equals() for objects?

A) == compares content, .equals() compares references.
B) == compares references, .equals() compares content.
C) Both compare content for all types.
D) Both compare references for all types.

22. Which collection class allows you to store unique elements and does not maintain insertion order?

A) ArrayList
B) HashMap
C) HashSet
D) LinkedHashSet

23. What is the purpose of this keyword?

A) Refer to the superclass object.
B) Create a new instance of a class.
C) Refer to the current instance of the class.
D) Declare a static variable.

24. Which of the following is not a valid loop construct ?

A) for loop
B) while loop
C) do-while loop
D) until loop

25. What is the purpose of the break statement ?

A) Skip the current iteration of a loop.
B) Terminate the loop or switch statement immediately.
C) Exit the entire program.
D) Restart a loop from the Starting.

26. Which keyword is used to prevent a method from being overridden?

A) static
B) abstract
C) final
D) private

27. What is the maximum value an int can hold ?

A) 2^15 - 1
B) 2^31 - 1
C) 2^32 - 1
D) Long.MAX_VALUE

28. Which of the following is true regarding Java's String class?

A) String objects are mutable.
B) String is a primitive data type.
C) String objects are stored in the stack.
D) String objects are immutable.

29. What is the purpose of Java Virtual Machine (JVM)?

A) To compile Java source code into bytecode.
B) To run Java bytecode on any platform.
C) To manage Java development tools.
D) To write Java code.

30. Which of the following is a checked exception ?

A) NullPointerException
B) ArrayIndexOutOfBoundsException
C) FileNotFoundException
D) ArithmeticException

31. What is the output of System.out.println(5 + 'A'); ?

A) 5A
B) 70
C) Error
D) A5

32. Which interface should be implemented to sort objects in a custom order ?

A) Serializable
B) Comparable
C) Cloneable
D) Iterable

33. What is the primary benefit of using ArrayList over a raw array ?

A) Faster access time for elements.
B) Fixed size, which saves memory.
C) Dynamic resizing and built-in methods.
D) Can store primitive data types directly.

34. Which keyword is used to call a method in the parent class from the child class?

A) this
B) current
C) super
D) parent

35. What is the concept of 'Abstraction' in OOP?

A) The ability to create multiple objects of the same class.
B) Hiding the implementation details and showing only essential features.
C) The process of converting code into machine language.
D) Inheriting properties from a parent class.

36. Which of the following statements is correct about interfaces ?

A) Interfaces can contain constructors.
B) Interfaces can have concrete (implemented) methods.
C) A class only has the ability to implement one interface.
D) Interfaces define a contract for classes to implement.

37. What is garbage collection ?

A) The process of manually deleting unused objects.
B) The process of freeing up memory by destroying objects that are no longer referenced.
C) The process of optimizing code during compilation.
D) The process of backing up data to prevent loss.

38. Which of the following is a Wrapper Class for int ?

A) Integer
B) Int
C) Number
D) String

39. Which keyword is used to handle an exception that might occur in a method?

A) caught
B) handles
C) throws
D) except

40. Which of the following statements about abstract classes is true?

A) These classes can be started directly.
B) Each class must contain at least a single abstract method.
C) Each class can extend multiple abstract classes.
D) These classes can have constructors.

41. What is the purpose of the default keyword in a Java 8 interface?

A) To make a method abstract and require implementation.
B) To allow an interface method to have an implementation.
C) To declare a static method that cannot be overridden.
D) To define a private method within the interface.

42. Which of the following is used for reading input from the console ?

A) System.out.println()
B) BufferedReader
C) Scanner class
D) FileReader

43. What is the purpose of the instance of operator ?

A) To compare two object references for equality.
B) To check if the object is a type of class or interface.
C) To create a new object of a class.
D) To determine the memory address of an object.

44. Which of the following data structures is typically implemented using a linked list in Java's Collections Framework?

A) ArrayList
B) HashMap
C) LinkedList
D) HashSet

45. What is autoboxing ?

A) The automatic conversion of a primitive type to its corresponding wrapper class.
B) The automatic conversion of a wrapper class object to its corresponding primitive type.
C) The process of converting a String to an int.
D) The manual conversion of a primitive type to its wrapper class.

46. Which of the following is true about static blocks ?

A) They are executed for each object instance created.
B) They are executed before the main() method.
C) They are used for garbage collection.
D) They must be placed inside a method.

47. What is the concept of 'Inheritance' ?

A) The ability to hide internal implementation details.
B) The procedure to build many methods with the exact same name.
C) A process in which a particular class acquires the behaviors and properties of any other class.
D) The capability of an object to possess in multiple forms.

48. Which of the following modifiers ensures that a class cannot be subclassed?

A) static
B) abstract
C) final
D) private

49. Why is the keyword volatile?

A) To make a variable immutable.
B) To ensure that a variable's value is always read from main memory and not from a CPU cache.
C) To declare a method that can be called without an object.
D) To prevent a class from being serialized.

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50. Which package contains the core classes for input/output operations?

A) java.util
B) java.lang
C) java.io
D) java.net

51. Which method is used to start a thread in Java?

A) run()
B) execute()
C) start()
D) begin()

52. What is the purpose of the 'synchronized' keyword in Java?

A) To make a method static
B) To ensure thread safety by allowing only one thread to access a resource
C) To prevent method overriding
D) To optimize memory usage

53. Which of the following is true about the 'transient' keyword?

A) It makes a variable immutable
B) It allows a variable to be accessed without an object
C) It marks a method as abstract
D) It prevents a variable from being serialized

54. What is the default value of an object reference in Java?

A) null
B) 0
C) false
D) undefined

55. Which collection interface is used to represent a key-value pair structure?

A) List
B) Map
C) Set
D) Queue

56. What is the output of System.out.println("Hello".substring(1, 4))?

A) Hell
B) ello
C) ell
D) Hel

57. Which of the following is true about Java’s 'final' class?

A) It can be instantiated but not extended
B) It cannot be instantiated or extended
C) It must contain only static methods
D) It cannot be extended but can be instantiated

58. Which keyword is used to explicitly throw an exception in Java?

A) throws
B) throw
C) try
D) catch

59. What is the purpose of the 'Comparable' interface’s compareTo() method?

A) To define a natural ordering for objects
B) To check if two objects are equal
C) To clone an object
D) To serialize an object

60. Which of the following is a valid declaration of an abstract method?

A) void method() {}
B) abstract void method() {}
C) abstract void method();
D) void abstract method();

61. What is the output of System.out.println(10 + 20 + "30")?

A) 60
B) 3030
C) 102030
D) Error

62. Which class is the superclass of all classes in Java?

A) Class
B) Object
C) System
D) java.lang.Object

63. Which of the following is true about the 'try-with-resources' statement?

A) It automatically closes resources implementing AutoCloseable
B) It can only be used with file operations
C) It requires a finally block
D) It cannot handle exceptions

64. Which method in the Object class is used to create a shallow copy of an object?

A) copy()
B) duplicate()
C) clone()
D) replicate()

65. What is the purpose of the 'strictfp' keyword in Java?

A) To ensure strict type checking
B) To enforce consistent floating-point calculations across platforms
C) To make a method thread-safe
D) To prevent method overriding

66. Which of the following collections maintains insertion order?

A) HashSet
B) HashMap
C) TreeSet
D) LinkedList

67. What is the purpose of the 'super()' call in a constructor?

A) To invoke the superclass’s constructor
B) To initialize instance variables
C) To call a static method
D) To create a new object

68. Which exception is thrown when accessing an invalid array index?

A) NullPointerException
B) ArithmeticException
C) ArrayIndexOutOfBoundsException
D) IllegalArgumentException

69. Which Java keyword is used to define a method that must be implemented by a subclass?

A) final
B) abstract
C) static
D) private

70. What is the purpose of the 'toString()' method in Java?

A) To convert a string to an integer
B) To compare two objects
C) To serialize an object
D) To return a string representation of an object

71. Which Java version introduced Lambda expressions?

A) Java 6
B) Java 8
C) Java 11
D) Java 17

72. Which package contains the Stream API?

A) java.stream
B) java.io.stream
C) java.util.stream
D) java.lang.stream

73. What is the purpose of Optional class?

A) To avoid NullPointerException
B) To make variables constant
C) To create immutable lists
D) To define interfaces

74. Which method is used to create a Stream from a List?

A) List.streamOf()
B) Stream.ofList()
C) createStream()
D) list.stream()

75. Which functional interface represents a function that takes one argument and returns a result?

A) Consumer
B) Function
C) Supplier
D) Predicate

76. Which Java version introduced the var keyword for local variables?

A) Java 8
B) Java 9
C) Java 10
D) Java 11

77. What is a Record in Java?

A) A mutable data class
B) A compact immutable data carrier class
C) A type of interface
D) A special loop structure

78. Which Java version officially introduced Records?

A) Java 16
B) Java 11
C) Java 8
D) Java 14

79. What is the purpose of sealed classes?

A) To prevent object creation
B) To enforce immutability
C) To restrict which classes can extend them
D) To define static methods only

80. Which Java version introduced Virtual Threads (Project Loom)?

A) Java 17
B) Java 19
C) Java 20
D) Java 21

81. Which method is used to filter elements in a Stream?

A) filter()
B) map()
C) reduce()
D) collect()

82. Which Stream method is used to transform elements?

A) filter()
B) map()
C) sorted()
D) limit()

83. Which interface represents a boolean-valued function?

A) Function
B) Consumer
C) Predicate
D) Supplier

84. Which keyword is used in switch expressions (Java 14+)?

A) yield
B) break
C) return
D) continue

85. What is the purpose of the module-info.java file?

A) To define main method
B) To define a Java module
C) To create records
D) To manage threads

86. Which Java feature allows pattern matching in instanceof (Java 16+)?

A) Records
B) Sealed Classes
C) Pattern Matching
D) Virtual Threads

87. Which method is used to combine multiple Streams into one?

A) merge()
B) Stream.concat()
C) join()
D) append()

88. Which Collector is used to convert a Stream into a List?

A) Collectors.map()
B) Collectors.groupingBy()
C) Collectors.counting()
D) Collectors.toList()

89. What does the flatMap() method do in Streams?

A) Flattens nested structures into a single stream
B) Sorts stream elements
C) Filters duplicate values
D) Limits stream size

90. Which method is used to create an immutable List in Java 9+?

A) new ArrayList()
B) Collections.unmodifiableList()
C) List.of()
D) Arrays.asList()

91. Which Java version introduced the HttpClient API?

A) Java 8
B) Java 11
C) Java 15
D) Java 17

92. Which interface represents a supplier of results with no input?

A) Supplier
B) Consumer
C) Function
D) Predicate

93. Which method is used to reduce elements of a Stream to a single value?

A) collect()
B) filter()
C) map()
D) reduce()

94. What is the purpose of text blocks introduced in Java 15?

A) To create secure strings
B) To encrypt text
C) To define multi-line string literals
D) To format numbers

95. Which annotation is used to mark a functional interface?

A) @Override
B) @FunctionalInterface
C) @Lambda
D) @Stream

96. Which method is used to create a completed CompletableFuture?

A) CompletableFuture.completedFuture()
B) CompletableFuture.start()
C) CompletableFuture.init()
D) CompletableFuture.create()

97. Which new feature improves switch statements in Java 14+?

A) Enhanced loops
B) Sealed classes
C) Records
D) Switch expressions

98. Which interface is implemented by lambda expressions?

A) Abstract class
B) Runnable only
C) Functional interface
D) Serializable only

99. Which Java feature simplifies immutable data modeling?

A) Streams
B) Records
C) Switch
D) Threads

100. Which feature improves concurrency performance in Java 21?

A) Virtual Threads
B) Garbage Collector
C) Reflection
D) Serialization

101. Which Java version is the latest LTS release as of 2024?

A) Java 11
B) Java 17
C) Java 21
D) Java 19

102. Which collection allows duplicate elements and maintains insertion order?

A) HashSet
B) ArrayList
C) TreeSet
D) HashMap

103. Which keyword is used to inherit a class in Java?

A) extends
B) implements
C) inherit
D) super

104. Which method is called automatically before an object is garbage collected?

A) destroy()
B) delete()
C) clean()
D) finalize()

105. Which class is used to create immutable date-time objects in Java 8?

A) Date
B) Calendar
C) LocalDate
D) Timestamp

106. Which access modifier provides the widest accessibility?

A) private
B) public
C) protected
D) default

107. Which exception occurs when a null object reference is accessed?

A) NullPointerException
B) IOException
C) SQLException
D) ClassCastException

108. Which interface is used to mark a class as serializable?

A) Cloneable
B) Runnable
C) Serializable
D) Comparable

109. Which collection stores key-value pairs?

A) Set
B) Queue
C) List
D) Map

110. Which operator is used for logical AND?

A) ||
B) &&
C) >>
D) ==

111. Which method returns the number of elements in a Collection?

A) size()
B) length()
C) count()
D) getSize()

112. Which Java feature allows one interface to have multiple implementations?

A) Encapsulation
B) Abstraction
C) Polymorphism
D) Compilation

113. Which keyword is used to define an interface?

A) class
B) abstract
C) package
D) interface

114. Which method is used to compare two strings ignoring case?

A) equals()
B) equalsIgnoreCase()
C) compare()
D) matches()

115. Which loop executes at least once regardless of the condition?

A) do-while
B) while
C) for
D) enhanced for

116. Which keyword is used to create an object?

A) create
B) object
C) new
D) make

117. Which package is imported automatically in every Java program?

A) java.util
B) java.io
C) java.net
D) java.lang

118. What is the size of a char in Java?

A) 16 bits
B) 8 bits
C) 32 bits
D) 64 bits

119. Which exception is a checked exception?

A) NullPointerException
B) IOException
C) ArithmeticException
D) ClassCastException

120. Which JVM component converts bytecode into native machine code at runtime?

A) Class Loader
B) Garbage Collector
C) JIT Compiler
D) Security Manager

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About the Author

Sanjay Prajapat

Sanjay Prajapat is a Data Engineer and technology writer with expertise in Python, SQL, data visualization, and machine learning. He simplifies complex concepts into engaging content, helping beginners and professionals learn effectively while exploring emerging fields like AI, ML, and cybersecurity in today’s evolving tech landscape.

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