Quiz | Croma Campus

Which of the following is not a feature of Java?

Object-oriented
Use of pointers
Portable
Dynamic

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

identifier
keyword
letter
underscore

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Which of the following is not a Java keyword?

class
interface
extends
pointer

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Which method of the class String is used to obtain length of String object?

get()
Sizeof()
lengthof()
length()

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Which of these can be used to create an object in Java?

new
malloc
alloc
create

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Which method must be implemented by all threads?

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

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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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In which memory a String is stored, when we create a string using new operator?

Stack
String memory
Heap
Random memory

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Which operator is used to perform the modulo operation?

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Which of these methods is used to read a string from the input stream?

get()
getLine()
read()
readLine()

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Which of the following is not an OOP concept in Java?

Inheritance
Encapsulation
Polymorphism
Compilation

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What is the size of a byte variable in Java?

8 bits
16 bits
32 bits
64 bits

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Which of these is returned by the operator '&'?

Character
Integer
Boolean
Float

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Which of these classes are thread-safe in Java?

Vector
ArrayList
LinkedList
None of the above

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Which of these are selection statements in Java?

break, continue
for, do, while
if, switch
try, catch

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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 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 keyword is used to create a new object?

malloc
alloc
new
create

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What is the use of the "instanceof" keyword?

Compare two objects
Check if object is of a particular class
Typecast object
None of the mentioned

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Which operator is used to test if a particular property exists or not?

in
instanceof
typeof
None of the mentioned

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Which of the following is a valid long literal?

0xnf024L
ABH8097
L990023
904423

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Which exception is thrown when java is out of memory?

MemoryError
OutOfMemoryError
MemoryOutOfBoundsException
MemoryFullException

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Which of these packages contains the exception StackOverflowError?

java.io
java.system
java.lang
java.util

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Which keyword is used to declare a constant in Java?

const
final
static
constant

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

ArrayList
Abstract class
Object class
String class

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Which method is the entry point for a Java application?

main
start
init
run

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

TRUE
FALSE
0
1

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What is the default value of the Boolean variable?

TRUE
FALSE
null
not defined

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

package
import
extends
implements

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