java questions paper

CENTRE FOR DEVELOPMENT OF ADVANCED COMPUTING

Advanced Computing Training School

Template for generation of Questions

Date:

Module Name: java

Question: 1 Which class cannot be a subclass in java

A: abstract classB: parent classC: Final classD: None of above

Question: 2 Why we use array as a parameter of main methodA. it is syntaxB. Can store multiple valuesC. Both of aboveD. None of above

Question: 3 Runnable isA. ClassB. MethodC. VariableD. Interface

Question: 4 Which is a reserved word in the Java programming language? A: method

B: native

C: subclasses

D: reference

Question: 5 What is the stored in the object obj in following lines of code?

box obj;

DASDM Term End Examination



A: Memory address of allocated memory of object.

B: NULL

C: Any arbitrary pointer

D: Garbage

Question: 6 What is the process of defining more than one method in a class

differentiated by method signature?

A: Function overriding

B: Function overloading

C: Function doubling

D: none of the mentioned

Question: 7 Which of the following is a method having same name as that of it’s

class?

A: finalize

B: delete

C: class

D: constructor

Question: 8 Which method can be defined only once in a program?

A: main method

B: finalize method

C: static method

D: private method

Question: 9 Package of drawstring() method isA. java.appletB. java.ioC. javax.swingD. java.awt

Question: 10 Which of these methods can be used to output a sting in an applet?




A: display()

B: print()

C: drawString()

D: transient()

Question: 11 Which method executes only onceA. start() methodB. init() methodC. stop() methodD. destroy() method

Question: 12 A class member declared protected becomes member of subclass

of which type?

A: public member

B: private member

C: protected member

D: static member

Question:13 Thread class is available inA. java.io packageB. java.lang packageC. java.awt packageD. java.util package

Question: 14 Which of this access specifies can be used for a class so that its

members can be accessed by a different class in the same package?

A: Public

B: Protected

C: No Modifier

D: All of the mentioned

Question: 15 Which of these access specifiers must be used for main() method?

A: private

B: public




C: protected

D: None of the mentioned

Question: 16 Minimum threads in a program areA. 1B. 2C. 5D. Many

Question: 17 Which of these keywords is not a part of exception handling?

A: try

B: finally

C: thrown

D: catch

Question: 18 Which of these keywords must be used to monitor for exceptions?

A: try

B: finally

C: throw

D: catch

Question: 19 Which of these keywords must be used to handle the exception

thrown by try block in some rational manner?

A: try

B: finally

C: throw

D: catch




Question: 20 What is the output of this program?

class exception_handling {

public static void main(String args[]) {

try {

System.out.print("Hello" + " " + 1 / 0);

}

catch(ArithmeticException e) {

System.out.print("World");

}

}

}

a) Hello

b) World

c) HelloWorld

d) Hello World

Question: 21 Which of these class is superclass of all other classes?

A: Math

B: Process

C: System

D: Object

Question: 22 If method have same name as class name and method don�t have any return type then it is known as

A. DestructorsB. ObjectC. VariableD. Constructor




Question: 23 Which of these standard collection classes implements a dynamic

array?

A: AbstractList

B: LinkedList

C: ArrayList

D: AbstractSet

Question: 24 Which of these methods can be used to obtain a static array from an

ArrayList object?

a) Array()

b) covertArray()

c) toArray()

d) covertoArray()




Question: 25 Which of these method is used to reduce the capacity of an

ArrayList object?

a) trim()

b) trimSize()

c) trimTosize()

d) trimToSize()

Question: 26 Which of these method is used to add an element to the start of a

LinkedList object?

a) add()

b) first()

c) AddFirst()

d) addFirst()

Question: 27 Which of these methods can be used to delete the last element in a

LinkedList object?

a) remove()

b) delete()

c) removeLast()

d) deleteLast()

Question: 28 Which of these method is used to change an element in a LinkedList

Object?

a) change()

b) set()

c) redo()

d) add()




Question: 29 What is multithreaded programming?

a) It’s a process in which two different processes run simultaneously.

b) It’s a process in which two or more parts of same process run simultaneously.

c) Its a process in which many different process are able to access same information.

d) Its a process in which a single process can access information from many sources.

Question: 30 Methods that have same name, but different Parameter list and different definition known as

A. OverridingB. ConstructorC. OverloadingD. none of these

View Answer

CQuestion: 31 Which of these method of Thread class is used to find out the

priority given to a thread?

a) get()

b) ThreadPriority()

c) getPriority()

d) getThreadPriority()

Question: 32 Which function of pre defined class Thread is used to check weather

current thread being checked is still running?

a) isAlive()

b) Join()

c) isRunning()

d) Alive()

Question: 33 Which of these interface is implemented by Thread class?

a) Runnable

b) Connections




c) Set

d) MapConnections

Question: 34 Which of these statement is incorrect?

a) A thread can be formed by implementing Runnable interface only.

b) A thread can be formed by a class that extends Thread class.

c) start() method is used to begin execution of the thread.

d) run() method is used to begin execution of a thread before start() method in special

cases.

Question: 35 Which of these class contains the methods used to write in a file?

a) FileStream

b) FileInputStream

c) BUfferedOutputStream

d) FileBufferStream

Question: 36 Which of these exception is thrown by close() and read() methods?

a) IOException

b) FileException

c) FileNotFoundException

d) FileInputOutputException

Question: 37 Which of these class is used to read and write bytes in a file?

a) FileReader

b) FileWriter

c) FileInputStream

d) InputStreamReader

Question: 38 Which of these class can be used to implement input stream that

uses a character array as the source?

a) BufferedReader




b) FileReader

c) CharArrayReader

d) FileArrayReader

Question: 39 Package of drawstring() method is

a) java.applet

b) java.io

c) javax.swing

d) java.awt

Question: 40 which one method is used to set the close operation?

A: setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE)

B: SetDefaultCloseOperation(jFrame.EXIT_ON_CLOSE)

C: setDefaultCloseOperation()

D: none

Question: 41 which one method is used to set the visibility of the frame?

A: setVisible(true).

B: setVisible(false).

C: setVisible()

D: none.

Question: Which method is used for getting the language in internationalization?

A: getDisplayLanguage()

B: GetdisplayLanguage()

C: GetDisplayLanguage().

D: none.

Question: 43 which one method used to set the state of the frame ?

A: setExtendedState()

B: SetExtendedState()

C: none




D: can not say

Question: 44 Which of these packages contains all the event handling interfaces?

a) java.lang

b) java.awt

c) java.awt.event

d) java.event

Question: 45 Which of these interfaces handles the event when a component is

added to a container?

a) ComponentListener

b) ContainerListener

c) FocusListener

d) InputListener

Question: 46 Which of these functions is called to display the output of an applet?

a) display()

b) print()

c) displayApplet()

d) PrintApplet()

Question: 47 Which of these methods can be used to output a sting in an applet?

a) display()

b) print()

c) drawString()

d) transient().

Question: 48 Which of these package is used for analyzing code during run-time?

a) java.applet




b) java.awt

c) java.io

d) java.lang.reflect

.

Question: 49 Which of these package is used for handling security related issues

in a program?

a) java.security

b) java.lang.security

c) java.awt.image

d) java.io.security

Question: 50 Which of these class allows us to get real time data about private

and protected member of a class?

a) java.io

b) GetInformation

c) ReflectPermission

d) MembersPermission

Question: 51 Which of these package is used for invoking a method remotely?

a) java.rmi

b) java.awt

c) java.util

d) java.applet

Question: 52 What is the length of the application box made by this program?

import java.awt.*;

import java.applet.*;

public class myapplet extends Applet {

public void paint(Graphics g) {




g.drawString("A Simple Applet", 20, 20);

}

}

a) 20

b) 50

c) 100

d) System dependent.

Question: 53 Which of these class is necessary to implement datagrams?

a) DatagramPacket

b) DatagramSocket

c) Both of the mentioned

d) None of the mentioned

Question: 54 Which of these method of DatagramPacket is used to find the port

number?

a) port()

b) getPort()

c) findPort()

d) recievePort()

Question: 55 Which of these is a protocol for breaking and sending packets to an

address across a network?

a) TCIP/IP

b) DNS

c) Socket

d) Proxy Server

Question: 56 Which of these interface abstractes the output of messages from

httpd?

a) LogMessage




b) LogResponse

c) Httpdserver

d) httpdResponse

Question: 57 Which of these is a standard for communicating multimedia content

over email?

a) http

b) https

c) Mime

d) httpd

Question: 58 Which of these method of MimeHeader is used to return the string

equivalent of the values stores on MimeHeader?

a) string()

b) toString()

c) convertString()

d) getString()

Question: 59 Which of these is an instance variable of class httpd?

a) port

b) cache

c) log

d) All of the mentioned

Question: 60 Which of these is an instance variable of httpd that is a Hashtable?

a) port

b) cache

c) log




d) stopFlag


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