Quiz | Croma Campus

What is the size of an int variable in Java?

4 bytes
2 bytes
8 bytes
16 bytes

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What does the expression 1.0 / 0.0 evaluate to in Java?

0
NaN
Infinity
Runtime Exception

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

TRUE
FALSE
0
1

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Which of these methods is a part of the Object class?

notify(), wait(), sleep()
notify(), wait(), clone()
sleep(), wait(), notifyAll()
sleep(), wait(), getObject()

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Which package contains the Random class?

java.util package
java.lang package
java.awt package
java.io package

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Which operator is used by Java for string concatenation?

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Which of these is a mechanism for naming and visibility control of a class and its content?

Object
Package
Interfaces
None of the mentioned

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Which of the following is not a Java features?

Dynamic
Architecture Neutral
Use of pointers
Object-oriented

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Which of the following is a reserved keyword in Java?

object
strictfp
system
main

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What is the size of int variable in Java?

8 bits
16 bits
32 bits
64 bits

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Which method is used to terminate a thread?

terminate()
end()
stop()
finish()

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Which method must be implemented by all threads?

start()
run()
stop()
main()

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Which exception is thrown when java is out of memory?

MemoryError
OutOfMemoryError
MemoryOutOfBoundsException
MemoryFullException

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What is the default value of an instance variable?

null
0
depends on the type of variable
default values are same as local variables

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Which keyword is used to refer to the current object?

this
super
self
current

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How many times can a constructor be called during the lifetime of the object?

As many times as necessary
Only once
Depends on the type of class
At least once

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Which method is used to schedule a thread for execution?

run()
start()
resume()
yield()

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Which of these classes is not part of Java's collection framework?

ArrayList
LinkedList
HashSet
Hashtable

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Which keyword is used for inheritance in Java?

inherit
extends
implements
inherits

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Which method is the starting point for all Java programs?

start()
main()
init()
run()

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Which keyword is used to declare a constant in Java?

const
final
static
constant

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What is synchronization in reference to a thread?

It?s a process of handling situations when two or more threads need access to a shared resource.
It?s a process by which many threads are able to access same shared resource simultaneously.
It?s a method that allows threads to communicate with each other.
It?s a method of coordinating access to a shared resource.

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Which of these are valid identifiers?

_var
$var
var
All of the mentioned

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What is the default value of a float variable?

0.0d
0.0f
0
0

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Which of the following is a valid long literal?

0xnf024L
ABH8097
L990023
904423

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Which of the following is not a valid way to create an array in Java?

int[] arr = new int[5];
int[] arr = {1, 2, 3, 4, 5};
int arr[] = new int[5];
int arr() = new int[5];

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Which of the following is not an access modifier in Java?

protected
private
public
transient

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Which of these cannot be used for a variable name in Java?

identifier
keyword
variable
constant

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Which class is the superclass of every class in Java?

ArrayList
Abstract class
Object
String

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Which of the following is not an access modifier?

public
protected
void
private

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