Java MCQ Questions and Answers for BCA, MCA, and GATE Exam

byPratap Solution Published:September 12, 2024

1. Which of these packages contains all the collection classes?

java.lang
java.util
java.net
java.awt

2. Which of these classes is not part of Java’s collection framework?

Map
ArrayException
Stack
Queue

3. Which of this interface is not a part of Java’s collection framework?

List
Set
SortedMap
SortedList

4. Which of these methods deletes all the elements from the invoking collection?

clear()
reset()
delete()
refresh()

5. What is a Collection in Java?

A group of classes
A group of interfaces
A group of objects
None

6. Which collection does not allow duplicate elements?

List
Set
Map
All of the mentioned

7. Which collection allows you to retrieve elements in the order they were inserted?

HashSet
TreeMap
LinkedHashMap
PriorityQueue

8. What is the implementation of the List interface?

HashMap
HashSet
LinkedList
LinkedHashSet

9. What are not the implementation classes of the List interface?

ArrayList
HashSet
LinkedList
Vector

10. Which class is a resizable array implementation?

LinkedList
ArrayList
HashSet
ArrayQueue

11. What is multithreaded programming?

It’s a process in which two different processes run simultaneously
It’s a process in which two or more parts of the same process run simultaneously
It’s a process in which many different processes are able to access the same information
It’s a process in which a single process can access information from many sources

12. Which of these are types of multitasking?

Process-based
Thread-based
Both
None

13. Thread priority in Java is?

Integer
Float
Double
Long

14. What will happen if two threads of the same priority are called to be processed simultaneously?

Anyone will be executed first lexicographically
Both of them will be executed simultaneously
None of them will be executed
It is dependent on the operating system

15. Which of these statements is incorrect?

A thread can exist only in two states, running and blocked
By multithreading CPU idle time is minimized, and we can make maximum use of it
By multitasking CPU idle time is minimized, and we can make maximum use of it
Two threads in Java can have the same priority

16. Which class is used to create a thread in Java?

Thread
Runnable
Process
Executor

17. What is the purpose of the `wait()` method in Java threads?

To pause the execution of a thread
To terminate a thread
To notify other threads to resume execution
To release the lock held by the thread

18. Which method is used to start the execution of a thread?

start()
run()
execute()
begin()

19. What is the purpose of the `join()` method in Java threads?

To interrupt the execution of a thread
To wait for a thread to finish its execution
To schedule the execution of a thread
To notify a thread to stop execution

20. What is the main advantage of multithreading in Java?

Improved program performance
Simplified program structure
Reduced memory usage
Elimination of runtime errors

21. Which does autoboxing or unboxing in Java?

Compiler
Runtime
Third-party tools
None

22. Which Java version introduced the feature Autoboxing and Unboxing?

Java 4
Java 5
Java 6
Java 7

23. What is the need for Autoboxing and Unboxing in Java?

Reduces code to be written by developers to convert from Wrapper to Primitive and vice versa
Compile time is reduced due to fixed methods followed to automatically convert Objects and Primitives
Auto-unboxing improves memory efficiency by converting Wrapper to Primitive and process when the object version is not needed
All of the mentioned

24. Autoboxing or Auto-unboxing works with ___ in Java.

Loops, Switch statements
Ternary Operator
IF ELSE statements
All the above

25. What is Truncation in Java?

Floating-point value assigned to an integer type
Integer value assigned to floating type
Floating-point value assigned to a Floating type
Integer value assigned to an integer type

26. Assert statement is a _____________ statement.

Concurrent and synthesizable
Sequential and synthesizable
Concurrent and Non-synthesizable
Sequential and Non-synthesizable

27. What is the use of assert statement in VHDL?

To print any string
To check the consistency and generate a message
Cause execution of sequential statements to wait
To check if a condition can stop the execution

28. What is the correct syntax for using ASSERT statement?

ASSERT condition [REPORT string] [SEVERITY name];
Condition [REPORT string] [SEVERITY name] ASSERT;
ASSERT condition [SEVERITY name] [REPORT string];
A

29. The assert statement displays a message when the condition is FALSE.

TRUE
FALSE
0
0

30. How many types of severity levels are there for the ASSERT statement?

1
2
3
4

31. The JUnit testing framework is an ____-source tool for Java developers.

Open
Closed
Both a & B
None

32. Code for unit tests ensures that the ____ of a program works as it should.

Logic
Data
Set
Array

33. ____, After, and others are some of the classes and interfaces contained in the org.junit package for JUnit testing.

Assert
Test
Before
All

34. How many types of unit testing are there?

2
3
4
5

35. Which of the following is/are the type(s) of unit testing?

Manual
Automated
Both A & B
None

36. There is a ____ with manual testing.

Time Commitment
Lack of reliability
Both a & B
None

37. The ____ of automated testing are greater.

Speed
Reliability
Both a & B
None

38. In the ____ annotation, the method is specified as a test method.

.@Test
.@Before
.@Test(timeout=1000)
.@After

39. Program logic can be asserted using the ____ class.

Org
Org.junit
org.junit.Assert
None

40. A primitive or object can be checked to be equal by calling ____.

void assertEquals(boolean expected, boolean actual)
void assertTrue(boolean condition)
void assertFalse(boolean condition)
void assertNull(Object obj)

41. Which of the following architecture does the Swing framework use?

MVC
MVP
Layered architecture
Master-Slave architecture

42. Which language is used in the Swing framework?

JavaScript
Java
React
Python

43. A ____ is the abstract foundation class for SWING's non-menu user interface controls.

Container
JComponent
Component
None

44. A ____ is the basic class for all SWING UI components.

Container
JComponent
Component
None

45. A ____ is a one-line input field that allows the user to choose a number or an object value from an ordered sequence.

JTextArea
JTextField
JSpinner
JSlider

46. How many types of events are there?

5
3
2
4

47. What is the feature of JavaFX?

FXML
Scene Builder
CSS-like Styling
All of them

48. The following is not a component of JavaFX.

Prism
Scene Graph
WebView
Browser

49. Prism is _______

an open graphics library
a high-performance hardware-accelerated graphical pipeline
a web engine
a media engine

50. Which class is extended to make any JavaFX application?

Scene
Stage
Group
Application

51. What are the major components of the JDBC?

DriverManager, Driver, Connection, Statement, and ResultSet
DriverManager, Driver, Connection, and Statement
DriverManager, Statement, and ResultSet
DriverManager, Connection, Statement, and ResultSet

52. Select the packages in which JDBC classes are defined?

jdbc and javax.jdbc
rdb and javax.rdb
jdbc and java.jdbc.sql
sql and javax.sql

53. Thin driver is also known as?

Type 3 Driver
Type-2 Driver
Type-4 Driver
Type-1 Driver

54. Which of the following methods is used to perform DML statements in JDBC?

executeResult()
executeQuery()
executeUpdate()
execute()

55. Which methods are required to load a database driver in JDBC?

getConnection()
registerDriver()
forName()
Both b & c

56. Which of the following is not a valid statement in JDBC?

Statement
PreparedStatement
QueryStatement
CallableStatement

57. A good way to debug JDBC-related problems is to enable?

JDBC tracing
Exception handling
Both a & b
Only b

58. JDBC-ODBC driver is also known as?

Type 4
Type 3
Type 1
Type 2

59. How many stages are used by Java programmers while using JDBC in their programs?

3
2
5
6

60. How many ways to register a driver?

2
3
4
5

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