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JAVA Quiz

Total Question :- 25

Total Time :- 5 Minute

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Remember: Learning is a continuous process, and every question is an opportunity to expand your knowledge. Best of luck, and may the JAVA be with you! 💡

1 / 25

Q 1 - What is the size of byte variable?

A - 8 bit

B - 16 bit

C - 32 bit

D - 64 bit

2 / 25

Q 2 - Can we have multiple classes in same java file?

True

False

3 / 25

Q 3 - What is the default value of String variable?

A - ""

B - ''

C - null

D - not defined

4 / 25

Q 4 - What is the default value of Object variable?

A - undefined

B - 0

C - null

D - not defined

5 / 25

Q 5 - A class always has a default constructor.

True

False

6 / 25

Q 6 - What is an applet?

A - An applet is a Java program that runs in a Web browser.

B - Applet is a standalone java program.

C - Applet is a tool.

D - Applet is a run time environment.

7 / 25

Q 7 - When static binding occurs?

A - Static binding occurs during Compile time.

B - Static binding occurs during load time.

C - Static binding occurs during runtime.

D - None of the above.

8 / 25

Q 8 - What is a transient variable?

A - A transient variable is a variable which is serialized during Serialization.

B - A transient variable is a variable that may not be serialized during Serialization.

C - A transient variable is a variable which is to be marked as serializable.

D - None of the above.

9 / 25

Q 9 - Can try statements be nested?

True

False

10 / 25

Q 10 - In which case, a program is expected to recover?

A - If an error occurs.

B - If an exception occurs.

C - Both of the above.

D - None of the above.

11 / 25

11. What does JVM stand for?

A. Java Virtual Machine

B. Java Visual Model

C. Java Variable Manager

D. Java Version Manager

12 / 25

12. Which keyword is used to declare a variable that does not change its value?

A. final

B. static

C. const

D. var

13 / 25

13. What is the purpose of the 'main' method in a Java program?

A. It is the starting point of the program.

B. It defines the main variables.

C. It handles exceptions.

D. It is used for memory allocation.

14 / 25

14. Which data type is used to store whole numbers in Java?

A. float

B. double

C. int

D. char

15 / 25

15. What is the result of the expression: 5 + 3 * 2?

A. 16

B. 11

C. 13

D. 26

16 / 25

16. What is the default value of a boolean variable in Java?

A. true

B. false

C. 0

D. 1

17 / 25

17. Which keyword is used to create an object in Java?

A. object

B. new

C. create

D. instance

18 / 25

18. What is the output of the following code snippet: System.out.println("Hello, " + "World!");

A. "Hello, World!"

B. Hello, World!

C. HelloWorld!

D. Error

19 / 25

19. Which loop is used to iterate a block of code a fixed number of times in Java?

A. for loop

B. while loop

C. do-while loop

D. repeat loop

20 / 25

20. What is the purpose of the 'break' statement in Java?

A. To terminate a loop or switch statement

B. To skip the next iteration of a loop

C. To exit a method

D. To print a line break

21 / 25

21. What is the purpose of the 'super' keyword in Java?

A. To access the superclass's members

B. To invoke the constructor of the current class

C. To declare a superclass

D. To specify the superclass in inheritance

22 / 25

22. What is the difference between 'ArrayList' and 'LinkedList' in Java?

A. ArrayList is synchronized, LinkedList is not

B. LinkedList is resizable, ArrayList is not

C. ArrayList allows fast random access, LinkedList allows fast insertion and deletion

D. ArrayList is a generic class, LinkedList is not

23 / 25

23. What is the purpose of the 'this' keyword in Java?

A. To refer to the current instance of the class

B. To create a new instance of the class

C. To invoke the superclass's methods

D. To access static members of the class

24 / 25

24. What is a lambda expression in Java and how is it used?

A. It is used to define anonymous classes

B. It is used to represent a sequence of statements

C. It is used to create instances of functional interfaces concisely

D. It is used for error handling in Java

25 / 25

25. What is the purpose of the 'transient' keyword in Java?

A. To make a variable thread-safe

B. To indicate that a variable should not be serialized

C. To make a variable constant

D. To declare a variable as volatile

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A Brief About JAVA

Java is a computer language that is written in high level with an object-oriented programming language developed by Sun Microsystems (now acquired by Oracle Corporation), was first released in 1995. It has minimal implementation dependencies, and it can do pretty much anything that you want to do, which makes it a great choice for a wide range of application types.

Key Features of Java

Platform Independence:

Java is compiled in bytecode which could be run on any Java Virtual Machine(JVM) supported device. The graphical representation of java is show below image that image shows that java compiler encircle with different operating system and execute the output of java is open with the respect of each operating system and erased that environment ultimately this capability become write once, run anywhere that it makes the java program highly portable.

Object-Oriented:

Java is an object-oriented programming (OOP) language and it has all the OOP concepts like inheritance, polymorphism, encapsulation, and abstraction.

JAVA Quiz (Free Online JAVA Test)

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11. What does JVM stand for?

12. Which keyword is used to declare a variable that does not change its value?

13. What is the purpose of the 'main' method in a Java program?

14. Which data type is used to store whole numbers in Java?

15. What is the result of the expression: 5 + 3 * 2?

16. What is the default value of a boolean variable in Java?

17. Which keyword is used to create an object in Java?

18. What is the output of the following code snippet: System.out.println("Hello, " + "World!");

19. Which loop is used to iterate a block of code a fixed number of times in Java?

20. What is the purpose of the 'break' statement in Java?

21. What is the purpose of the 'super' keyword in Java?

22. What is the difference between 'ArrayList' and 'LinkedList' in Java?

23. What is the purpose of the 'this' keyword in Java?

24. What is a lambda expression in Java and how is it used?

25. What is the purpose of the 'transient' keyword in Java?

NOTE:

1. Click the 'Submit Test' button given in the bottom of this page to Submit your answers.

2. Test will be submitted after time is Expired.

3. Do not refresh the Page.

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