Quiz | Croma Campus

What is the size of an int variable in Java?

4 bytes
8 bytes
2 bytes
1 byte

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Which package is directly available to our class without importing it?

java.util
java.lang
java.io
java.net

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What is the default encoding for an InputStreamReader?

UTF-8
ASCII
ISO-8859-1
UTF-16

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Which of these data types is used to store text in Java?

int
float
char
String

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Which of the following is used to create a package in Java?

package
import
include
namespace

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Which method is used to write bytes to an output stream?

read()
write()
print()
display()

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

int
float
double
real

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Which method of the String class can be used to test if two strings are equal?

equals()
isEqual()
same()
matches()

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Which of these exceptions is thrown when the servlet is not initialized properly?

IOException
ServletException
NullPointerException
IllegalStateException

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Which of the following is true about Java?

Java is platform-independent
Java is a procedural language
Java does not support multithreading
Java is not object-oriented

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Which of the following is not a valid method of the HashMap class in Java?

put()
get()
size()
length()

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Which of the following is not a type of loop in Java?

for
while
do-while
repeat-until

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

package
import
extends
implements

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Which is not a valid way to declare an array in Java?

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

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Which method is used to perform some action when an object is to be destroyed?

finalize()
delete()
remove()
destructor()

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Which of these is not a valid component of the Android architecture?

Intent
Activity
Services
Action

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Which of the following is a marker interface?

Serializable
Cloneable
Remote
All of the above

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Which of the following is used to create a synchronized block in Java?

synchronized
sync
lock
thread

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Which method is used to compare two strings in Java?

equals()
compare()
compareTo()
equalsIgnoreCase()

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What is the return type of the hashCode() method in the Object class?

Object
int
long
void

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

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

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Which of the following is used to create a thread in Java?

Runnable interface
Thread class
Both A and B
None of the above

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Which method is used to start a thread in Java?

run()
start()
begin()
init()

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What does JVM stand for?

Java Very Machine
Java Virtual Machine
Java Verified Machine
Java Variable Machine

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Which operator is used for concatenation of strings in Java?

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

try-catch
throw
throws
All of the above

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Which of the following is not a valid method of the Stack class in Java?

push()
pop()
size()
length()

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What does the 'static' keyword mean in Java?

The variable or method is specific to an instance of a class
The variable or method is specific to the class
The variable or method can be accessed anywhere
None of the above

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What is the use of the 'final' keyword in Java?

To define constants
To prevent method overriding
To prevent inheritance
All of the above

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Which of these is a correct interface not used in the Collection framework?

Set
SortedList
List
Map

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