Quiz | Croma Campus

What is the output of System.out.println("Hello".charAt(1));?

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What is the size of an int data type in Java?

4 bytes
2 bytes
8 bytes
1 byte

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

new ClassName()
Class.forName("ClassName").newInstance()
ClassName.clone()
ClassName.new()

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Which of the following is used to create a new instance of an array in Java?

new
create
instantiate
allocate

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Which method is used to read a line of text from the console in Java?

readLine()
read()
getLine()
nextLine()

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Which method is used to stop a thread in Java?

stop()
end()
terminate()
kill()

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Which of the following is used to find the absolute value of a number in Java?

Math.abs()
Math.absolute()
Math.absValue()
Math.absoluteValue()

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

TRUE
FALSE
0
null

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Which of the following is not a control statement in Java?

break
continue
exit
return

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Which of the following is used to handle exceptions in Java?

try-catch
if-else
switch-case
for-loop

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

int
float
boolean
String

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Which method must be implemented by all threads in Java?

run()
start()
stop()
sleep()

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What is the output of System.out.println("Hello World".substring(6));?

Hello
World
Hello World
World Hello

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Which of the following is a reserved word in Java?

main
System
new
print

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Which method is used to find the length of a string in Java?

length()
size()
getSize()
getLength()

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Which keyword is used to define a subclass in Java?

subclass
inherits
extends
implements

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What is the output of System.out.println(Math.min(3, 7));?

3
7
0
Error

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What does the static keyword mean in Java?

The variable or method belongs to the instance
The variable or method belongs to the class
The variable or method is private
The variable or method is final

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Which of the following is a marker interface?

Serializable
Cloneable
Remote
All of the above

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Which method is used to get the current date and time in Java?

currentTime()
getTime()
now()
LocalDateTime.now()

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Which of the following is not a keyword in Java?

strictfp
null
instanceof
native

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Which of the following is not a valid Java identifier?

_myVariable
$myVariable
123myVariable
myVariable123

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What does the acronym JVM stand for?

Java Virtual Machine
Java Variable Machine
Java Virtual Method
Java Visual Machine

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Which interface is used to store a collection of elements in Java?

List
Set
Map
All of the above

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Which of the following is not a Java feature?

Object-Oriented
Portable
Dynamic
Use of Pointers

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What is the base class for all exceptions in Java?

Throwable
Exception
RuntimeException
Error

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Which operator is used for comparing two values?

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Which method is used to start a thread execution?

run()
start()
execute()
launch()

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What is the superclass of all classes in Java?

Object
Class
Interface
Base

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Which of the following is true about Java's garbage collection?

It is manual
It is automatic
It is optional
None of the above

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