JAVA MCQ

Soopro Pathshala provides JAVA MCQ(Multiple Choice Questions)

1. What is the extension of java code files?

a) .js

b) .txt

c) .class

d) .java

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2. Which of the following is not a Java features?

a) Dynamic

b) Architecture Neutral

c) Use of pointers

d) Object-oriented

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3. _____ is used to find and fix bugs in the Java programs.

a) JVM

b) JRE

c) JDK

d) JDB

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4. What is the extension of compiled java classes?

a) .txt

b) .js

c) .class

d) .java

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5. Which exception is thrown when java is out of memory?

a) MemoryError

b) OutOfMemoryError

c) MemoryOutOfBoundsException

d) MemoryFullException

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6. Which of these are selection statements in Java?

a) break

b) continue

c) for()

d) if()

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7. Which of the following is a superclass of every class in Java?

a) ArrayList

b) Abstract class

c) Object class

d) String

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8. What is the numerical range of a char data type in Java?

a) 0 to 256

b) -128 to 127

c) 0 to 65535

d) 0 to 32767

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9. Which of the following is true about the anonymous inner class?

a) It has only methods

b) objects can't be created

c) it has a fixed class name

d) it has not class name

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10. Arrays in java are___

a) object references

b) objects

c) primitive data type

d) none

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11. When is the object created with new keyword?

a) at compile time

b) at runtime

c) depends on the code

d) none

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12. In which of the following is toString() method defined?

a) java.lang.object

b) java.lang.string

c) java.lang.util

d) none

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13. What is false about constructor?

a) Constructors cannot be synchronized in Java

b) Java does not provide default copy constructor

c) Constructor can have a return type

d) “this” and “super” can be used in a constructor

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14. Which keyword is used for accessing the features of a package?

a) package

b) import

c) extends

d) export

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15. In java, jar stands for___

a) Java Archive Runner

b) Java Application Resource

c) Java Application Runner

d) none of the above

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16. On which platforms java runs?

a) Windows

b) Mac OS

c) UNIX

d) all of these

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17. Which one of the following is an Unary operator in Java?

a) ()

b) *

c) +

d) ++

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18. Which of the following operator has more precedence?

a) ()

b) ++

c) *

d) >=

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19. Which of the following is not an operator in Java?

a) |

b) ^

c) ~

d) <->

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20. What was the original name for Java?

a) C++

b) Oak

c) Pine

d) Maple

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21. What does JVM stand for?

a) Java version machine

b) Java Virtual mechanism

c) Java Verfified Module

d) Java Virtual Machine

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22. What does JDK include?

a) Only a compiler

b) only a runtime environment

c) both a compiler and a runtime environment

d) none of the above

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23. Which of the following is NOT a part of the JRE?

a) Bytecode verifier

b) class loader

c) Java Compiler

d) Java API classes

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24. What is the primary function of JRE?

a) Compilation

b) Debugging

c) Execution

d) Development

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25. Can you run a Java without JRE?

a) Yes

b) No

c) cant say

d) none of these

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26. Is JVM platform-independent?

a) Yes

b) No

c) cant say

d) none of these

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27. What operator is used to perform bitwise "AND" operation?

a) &&

b) &

c) |

d) ||

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28. What does the == operator compare in Java objects?

a) Values

b) References

c) Hash codes

d) Fields

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29. Which operator is used for logical "AND" operation?

a) &&

b) &

c) ||

d) |

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30. Which of the following is not a primitive data type in Java?

a) byte

b) String

c) double

d) short

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31. What is the default value of the int data type?

a) 0

b) 1

c) null

d) undefined

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32. Which of the following data types can store a floating-point number?

a) int

b) byte

c) double

d) char

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33. Which data type can store a single character?

a) String

b) byte

c) char

d) int

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34. How many bits does the long data type use?

a) 8

b) 16

c) 32

d) 64

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35. What is an infinite loop?

a) A loop that executes only once

b) A loop that never terminates naturally

c) A loop that contains an unreachable code block

d) A loop that uses the continue statement

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36. Which statement is used to exit a loop prematurely?

a) return statement

b) continue statement

c) break statement

d) exit statement

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37. How do you declare an array in Java?

a) int arrayName;

b) int [] arrayName

c) int arrayName[];

d) both b and c

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38. Which of the following has the highest memory requirement?

a) Heap

b) Stack

c) JVM

d) Class

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39. Which of these can be overloaded?

a) Methods

b) Constructors

c) all of the mentioned

d) none of the mentioned

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40. Which of the following is a mutable class in java?

a) java.lang.string

b) java.lang.byte

c) java.lang.object

d) java.lang.stringbuilder

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