Quiz | Croma Campus

What is the base class of all classes in Java?

Object
Class
Base
Root

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Which class is used to read characters in Java?

FileReader
FileInputStream
BufferedInputStream
DataInputStream

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Which of the following is a valid declaration of a char in Java?

char ch = 'A';
char ch = "A";
char ch = A;
char ch = 'A"';

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What does JVM stand for in Java?

Java Variable Model
Java Virtual Machine
Java Visual Model
Java Version Machine

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Which of these classes are used by Byte streams for input and output operation?

InputStream
ObjectInputStream
Reader
InputStreamReader

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Which method in the Servlet interface is called once to initialize the servlet?

init()
start()
initServlet()
service()

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Which of the following is true about a constructor in Java?

It can be inherited
It cannot be overloaded
It does not have a return type
It is called explicitly

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When a thread is created and started, what is its initial state?

Ready
Running
Waiting
Sleeping

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Which method is used to return the name of a thread?

getName()
getId()
getThread()
getThreadName()

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Which of the following methods is used to start a thread execution?

execute()
begin()
start()
run()

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Which of the following is true about a static method?

It can access instance variables
It can be overridden
It cannot be called from a static context
It can be called using the class name

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Which of the following is not a Java feature?

Object-oriented
Use of pointers
Portable
Dynamic

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What is the main purpose of the Java ClassLoader?

To load classes at runtime
To compile Java code
To execute bytecode
To interpret Java code

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Which of these methods deletes all the elements from invoking collection?

clear()
reset()
delete()
refresh()

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In which package is the JDBC API included?

javax.swing
java.net
java.sql
java.util

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Which method must be implemented by all threads?

wait()
start()
run()
stop()

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Which of these methods can be used to make the main thread wait for all child threads to finish?

sleep()
isAlive()
join()
stop()

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What is the use of the final keyword in Java?

To mark a class as not extendable
To mark a method as not overridable
To mark a variable as constant
All of the above

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

pkg
Pkg
import
Import

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

Stack
String Pool
Heap memory
Random memory

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Which of the following is not a valid Java keyword?

strictfp
constant
goto
native

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What is the return type of the main method in Java?

void
int
String
float

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Which of these access specifiers can be used for an interface?

public
protected
private
All of the above

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Which of the following is not a valid declaration within an interface?

public int method();
void method();
protected void method();
static int method();

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Which of the following is a checked exception?

NullPointerException
ClassCastException
IOException
ArrayIndexOutOfBoundsException

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Which of these methods form the interface of Runnable?

run()
stop()
start()
runThread()

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Which of the following is not a valid Java keyword?

transient
volatile
const
synchronized

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

int
float
double
long

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Which of these keywords is used to define interfaces in Java?

interface
Interface
intf
Intf

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Which of these packages contains the exception StackOverflowError?

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

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