Java programming moc test

8/17/2019 Java programming moc test

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1 Consider the following program:

public class ExceptionType {

public static void main(String

args!" { String s # null$

try

{ System%out%println(s%le

ngth(""$

&

catch(Exception e"

{ System%out%println('Excep

tion 1'"$

&

nally { try {

generateExcepti

on("$&

catch(Exception e"

{ System%out%println('Excep

tion )'"$

&

&

&

static void generateException(" throws *llegal+rgumentException{

throw new *llegal+rgumentException("$

&

&

,hich of the following statements are true regarding the above

given program- (Choose ."

+nswer: a% The output 'Exception )' is because of the

exception thrown programmatically

b% The output 'Exception 1' is because of the Exceptionthrown

programmatically

c% The output 'Exception 1' is because of the Exceptionthrown

by /0

d% The Exception thrown by generateException(" methodis an

2nchec3ed Exception


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e% The output 'Exception )' is because of the

Exception thrown by /0

) Consider the followingcode:

public class Except {

private void method1(" throws Exception {

throw new 4untimeException("$

&

public void method)(" {

try {

method1("$

& catch (4untimeException e"

{ System%out%println('Caught

Exception'"$

& catch (Exception e" {

System%out%println('Caught 4untime Exception'"$

&

&


args!" { Except e # newExcept("$

e%method)("$

&

&

,hich of the following gives the correct output for the abovecode-

+nswer: a% 5o output

b% Compile time error

c% 6rints: Caught 4untime

Exception

d% 6rints: Caught Exception


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. ,hich of the following statements are true about String

+rrays- (Choose )" +nswer: a% +rray

index can be a long value

b% +rray index can be a negative

value c% String!! s # new

String7!!$

d% String!! s$

e% +rray decaration: String8!strarray$

9 Consider the following scenario:

The eneric;ruit class defines the following method to return afloat value:

public float calories( float serving " {

which

extends eneric;ruit> proposes to dene the following

overriding method:

public double calories( double serving " {


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parameter list%


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7 Consider the followingprogram:

public class TestStart implements 4unnable {

boolean stoper # true$

public void run(" {

System%out%println ('4un method Executed'"$

&

public static void main

(String! argv" { TestStart

ob=*nt # new TestStart("$

Thread thread? # new

Thread(ob=*nt"$ thread?%start("$

thread?%start("$

&&

,hat will be the output of the above program-

+nswer: a% Compiles and executes

successfully

6rints '4un method executed'

b% Compiles and on execution

6rints '4un method executed'then

throws 4untime exception

c% Compilation Error

d% Compiles and on execution

6rints '4un method executed'

8 Consider the following program:

class + extends Thread {

private int i$

public void run(" {i # 1$&

public static void

main(String! args" { + a #

new +("$

a%start("$

System%out%print(

a%i"$


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&

&


+nswer: a% 6rints @

A Consider the followingcode:

import =ava%util%B$

public class Code1@ {

{

nal 0ector v$

v#new 0ector("$

&

public Code1@(" { &

public void codeethod("

{ System%out%println(v%isE

mpty(""$

&

public static void main(String args!" {

new Code1@("%codeethod("$

&

&

b% 6rints:

@1 c%

6rints: 1@

d% 6rints

1

e% Compiletimeerror

,hich of the following will be the output for theabove code-

+nswer: a% 4untime error:5ull6ointerException


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b% 6rints: false

c% Compilation error: cannot nd the symbol

d% 6rints:

true

e% Compilation error: v is not initialised inside theconstructor

D Consider the following code:

*n the following code method+ has an inner class

1% public class ase {)% private static nal int *F # .$

.% public String name$

9% public void method+( int nn "{

7% nal int serial5 # 11$

8% class inner {

A% void show4esult("{

D% System%out%println( '4slt# ' G ?? "$

H% &

1@% &


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H Consider the following scenario:

+ /ava application needs to stream a video from a movie le%

,hich of the following options gives the correct combination of

stream classes that can be used to implement the above

reJuirement-

+nswer: a% *nputStream4eader and

;ile*nputStream

b% ;ile*nputStream and ;ilter*nputStream

c% Kine*nputStream and uLered*nputStream

d% ;ile4eader and uLered4eader

e% ;ile*nputStream and uffered*nputStream

1@ ,hich of the following options are true about abstractimplementations in

Collections-(choose ."

+nswer: a% *t provides static factory class

b% +ll ma=or implementations li3e Mashtable>

0ectors are supported

c% They provide hoo3s for custom

implementations d% +ll ma=or interfaces

are supported

e% ap is not supported

11 Consider the following code:

class +T1 {

public static void main (String! args" {

byte! a # new byte1!$ long! b # new long1!$


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Noat! c # new float1!$ Ob=ect! d # new

Ob=ect1!$

System%out%print(a@!G'>'Gb@!G'>'Gc@!

G'>'Gd@!"$

&

&

,hich of the following will be the output of the above code-

+nswer: a% 6rints: @>@>@>null

b% 5one of the listed

options

c% 4untime error

d% 6rints: @>@>@%@>null

e% Compiletime error

1) Consider the following code snippet:

interface i1 {

int i # @$&

interface i) {

int i # @$

&

class inter implements i1>

i) { public static void

main(String! a"

{ System%out%println(i"$

&

&

,hich of the following options will be the output of the abovecode snippet-

a% 4untime Error

b% 6rints: @

c% 5o output

d% Compilation Error


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1. The following class denitions are in separate les% 5ote that the

,idget andig,idget classes are in different pac3ages:

1% pac3age conglomo$

)% public class ,idget extends Ob=ect{

.% private int my,idth$

9% ?????? void set,idth( int n " {

7% my,idth # n$

8% &

A% &

used in line 9 instead of

??????> would allow the ig,idget class to access the

set,idth method (as in line 1)"- (Choose )"

+nswer: a% nal

b% default (blan3"> that is> the method declaration

would read void set,idth( int n "

c% protected

d%private

e%public


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19 ,hich of the following statements are true regarding toString("

method-(Choose ."

+nswer: a% Feclared in the Ob=ect

class b% *t is polymorphic

c% Essential for inheriting a

class d% Fened in the

Ob=ect class

e% ives the String representation of anOb=ect

7 *t is possible to create a table using /FC +6*% State True or ;alse%

+nswer: True ;alse

18 Consider the following codesnippet:

import =ava%util%B$

public class TestColD{


argv!"{ TestColD =un3 # new

TestColD("$ =un3%sampleap("$&

public void sampleap("

{ Treeap tm # new

Treeap("$

tm%put('a'>'Mello'"$

tm%put('b'>'/ava'"$


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tm%put('c'>',orld'"$

*terator it #

tm%3eySet("%iterator("$

while(it%has5ext(""

{ System%out%print(it%next("

"$

&

&

&

,hat will be the output of the above code snippet-

+nswer: a% abc

1A Consider the followingprogram:

public class Exp9 {

static String s # 'smileP%%'$

public static void

main(String! args" { new

Exp9("%s1("$

System%out%println(s"$

&

void s1(" {

try {s)("$

&

catch (Exception e" {

s G# 'morning'$

&

&

b% 4untime

error c% M,/

d% Mello/ava,orld

e% Compile error


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void s)(" throws Exception {

s.("$

s G# 'evening'$

s.("$

s G# 'good'$

&

void s.(" throws Exception {

throw new Exception("$

&

&


+nswer: a%

smileP%%morningeveni

ng

b% smileP%%morning

1D Consider the following code snippet:

import =ava%io%B$

class Test {

int a # 1@$&

c% smileP%%

d% smileP%%eveningmorning

e%smileP%%morningeveninggood

class Test) extends Test implements SerialiQable {

int b$

public String toString(" {

return 'a # ' G a G '> ' G 'b # ' G b$

&


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&

public class *OCode7 {

public static void main(String args!" throws

;ile5ot;oundException> *OException>

Class5ot;oundException {

Ob=ectOutputStream out # new Ob=ectOutputStream(new

;ileOutputStream('C:


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)@ Consider the following code:

public class Kabeledrea3) {

public static void main(Stringargs!" {

loop:

for(int =#@$ =R)$ =GG" { for(int

i#@$ iR1@$ iGG" {

if(i ## 7" brea3

loop$

System%out%print(i G ' '"$

&

&

&

&

c% =ava%lang

d%

=ava%lang%annotati

on

e%=ava%sJl

,hich of the following will be the output for the above code-

+nswer: a% @ 1 ) . 9 @ 1 )

. 9

b% @ 1 ) . 9 7

c% @ 1 ) . 9

)1 Consider the following codesnippet:

abstract classFirector {

protected St

ri


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ng name$ d% 1 ) . 9 7

e% *ndenite Koop


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Firector(String name" {

this%name # name$

&

abstract void occupation("$

&

class ;ilmFirector extends

Firector { ;ilmFirector(String

name" { super(name"$

&

void occupation(" {

System%out%println('Firector ' G name G ' directs lms'"$

&

&

public class TestFirector {

public static void main(String! args" {

;ilmFirector fd # new ;ilmFirector('anirathnam'"$

fd%occupation("$

new Firector('anirathnam'" {

void occupation(" {

System%out%println('Firector ' G name G ' also produces lms'"$

&

&%occupation("$&

&

,hich of the following will be the output of the above codesnippet-

+nswer: a% Compilation fails at TestFirector class

b% 6rints: Firector anirathnam also produces

lms

c% 6rints: Firector anirathnam directs lms

Firector anirathnam also produces lms

d% 6rints: Firector anirathnam directs lms


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e% 4untimeError

)) Felimiters themselves be considered as to3ens% State True or;alse%

+nswer: True ;alse

). Consider the following scenario:

+ company decides that it only wants to use the most popular

names for its products% ou have to give the number of

employees against each uniJue rst name%

,hich of the following four core interfaces is bestsuited for

implementing the above scenario-

+nswer: a% ap

b% Set

c% ueue

d% Kist

)9 ,hich of the following modifier cannot be applied to thedeclaration of a eld

(member of a class"-

+nswer: a% protected

b% private

c% nal


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d% public

e% abstract

)7 ,hich of the following class in =ava%sJl pac3age maps the SK

data types to /ava datatypes-

+nswer: a% /FCTypes

b% /FCSKTypes

c% 5o explicit data type mapping% +utomatically mapped

on

uery Call%

d% Types

e% SKTypes

)8 ,hich of the following codes will compile and run properly-

+nswer: a% public class Test1 {public static void main(" {

System%out%println('Test1'"$

&

&

b% public class Test) {

static public void

main(String! in"

{ System%out%println('Test)'

"$

&

&

c% public class Test. {

public static void

main(String args"

{ System%out%println('Test.'

"$

&


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&

d% public class Test9 {

static int main(String args!" {


&

&

e% public class Test7 {

static void main(String! data"{


&

&

)A Consider the following code:

public class ,rap*t {

public static void main(String! args" {

new ,rap*t("%testC(IaI"$

&

public void testC(char ch" {

*nteger ss # new*nteger(ch"$

Character cc # new

Character(ch"$

if(ss%eJuals(cc""

System%out%print('eJuals '"$

if(ss%int0alue("##cc%char0alue(""

{ System%out%println('E'"$

&

&

&

,hich of the following gives the valid output for the

above code- +nswer: a% 6rints: eJuals

b% Compiletime error: *nteger wrapper cannot accept

char type c%6rints: E


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d% Compiletime error: ,rapper types cannot be

compared using eJuals

e% 6rints: eJuals E

)D ,hich of the following statements are valid . dimensional

character array creations-(Choose )"

+nswer: a% char!!! char+rray # {{IaI> IbI&> {IcI>

IdI&> {IeI> IfI&&$ b% char!!! char+rray #

{{{IaI> IbI&> {IcI> IdI&> {IeI> IfI&&&$

c% char!!! char+rray # {{IaI> IbI&> {IcI> IdI&>

{IeI&&$

d% char!!! char+rray # new char)!)!!$

e% char)!)!! char+rray # {IaI> IbI&$

)H Consider the following class denition:

class *nOut{

String s# new

String('etween'"$ public

void amethod(nal int i+rgs"

{ int iam$

class icycle{

public void sayMello("{

%%%Kine 1

&

&


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,hich of the following statements would be correct to be

coded at %%%Kine 1- (Choose )"

+nswer: a%System%out%println(i+rgs"$

b% System%out%println(iam"$

c%System%out%println(iOther"$

d% System%out%println(s"$

.@ Consider s1 and s) are sets%

,hich of the following options gives the exact meaning of

the method call s1%retain+ll(s)"-

+nswer: a% transforms s1 into the union of s1 and s)

b% transforms s1 into the intersection of s1 and s)%

c% transforms s1 into the (asymmetric" set

difference of s1 and s)

d% copies elements from s) to s1

e% returns true if s) is a subset

of s1

.1 ,hich of the following annotations are dened in =ava%lang

pac3age- (Choose ." +nswer:

a% U S u pp ress,arn ing s

b% UTar g et

c% U4e t enti o n

mailto:@SuppressWarningsmailto:@Targetmailto:@Retentionmailto:@Retentionmailto:@Retentionmailto:@Targetmailto:@Retentionmailto:@SuppressWarnings


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.) Consider the following code:

class Test

{ Test(in

t i" {

System%out%println('Test(' Gi G'"'"$

d% UOverri d e

e% Udeprecated

&

&

public class uestion{

static Test t1 # new

Test(1"$ Test t) #

new Test()"$

static Test t. # new Test(."$

public static void

main(String! args"

{ uestion # new

uestion("$

&&

,hich of the following options gives the correct order ofinitialiQation-

+nswer: a% Test(."

Test()"

Test(1"

b% Test()"

Test(1"

Test(."

c% Test(1"

Test()"

Test(."

d%

Test(1"

Test(."

Test()"

mailto:@Overridemailto:@Overridemailto:@Override


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.. ,hich of the following methods is used to chec3 whether

4esultSet ob=ect contains records-

+nswer: a% rst("

b% has4ecords("

c% next("

d% last("

e% previous("

.9 ,hich of the following options are true about +ssociations-

(choose )" +nswer: a% *n +ssociations> cardinality refers

to the number of related

ob=ects

b% +ssociation refers to binding of related data andbehaviours

into a single entity

c% +ssociations are bidirectional

d% +ssociation refers to a class reuses the

properties and methods of another class

e% +ssociation refers to an ob=ect composed of set ofother

ob=ects

.7 Consider the following codesnippet:

class TestString9 {


args!" { String s1 # '*ts

reat'$

String s) # '*ts Tric3y'$

System%out%print(s1%concat(s)"%length(" G ' '"$


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System%out%print(s1%concat(s)%substring(1> s1%length("""%length(""$

&

&

,hat will be the output of the following code snippet-

+nswer: a% 1D )@

b% 1A 1H

c% )@ 1D

d% 1A 1A

e% 1H 1A

.8 Consider the followingcode:

class 6lanet { &

class Earth extends 6lanet { &

public class ,elcome6lanet {

public static void welcome6lanet(6lanet planet" {

if (planet instanceof Earth"

{ System%out%println(',elc

omeP'"$

& else if (planet instanceof

6lanet"

{ System%out%println('6lan

etP'"$

& else {

System%exit(@"$

&

&

public static void main(String args!"{ ,elcome6lanet wp # new

,elcome6lanet("$ 6lanet planet #

new Earth("$

welcome6lanet(planet"$

&

&


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,hich of the following will be the output of the above program-

+nswer: a% +n exception is thrown at

runtime

b% The code runs with no output

c% ,elcomeP

d%6lanetP

e% Compilation fails

.A ,hat methods does the =ava%lang%4untime class provide

related to memory management-(Choose ."

+nswer: a% to invo3e arbage collector

b% to create new memory locations

c% to Juery the total memory and free

memory d% to dump the ob=ects to

storage device

e% to run naliQe methods explicitly

.D ,hich of the following statement is true-

+nswer: a% To call the wait(" method> a thread must own

the loc3 of the ob=ect on which the call is to bemade%

b% To call the yield(" method> a thread must own

the loc3 of the ob=ect on which the call is to be

made%

c% To call the sleep(" method> a thread must own the

loc3 of the ob=ect which the call is to be made%


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d% To call the wait(" method> a thread must own the

loc3 of the current thread%

e% To call the =oin(" method> a thread must own the

loc3 of the ob=ect on which the call is to be made

.H ,hich of the following statements are true-

(Choose )" +nswer: a% +ll exceptions are

thrown by /0

b% +ll 4untimeException are thrown by /0

c% /0 cannot throw userdened exceptions

d% +ll exceptions are thrown programmatically from thecode or

+6*

e% /0 thrown exceptions can be thrownprogrammatically

9@ Consider the followingcode:

public class 2nwiseThreads implements 4unnable {

public void run(" {

while(true"{ &

&

public static void main(String args!"

{ 2nwiseThreads ut1 # new

2nwiseThreads("$ 2nwiseThreads

ut) # new 2nwiseThreads("$

2nwiseThreads ut. # new

2nwiseThreads("$ ut1%run("$

ut)%run("$

ut.%run("$

&

&


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,hich of the following is correct for the above given program-


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+nswer: a% The code compiles and runs . non ending non

daemon threads

b% The code compiles but runs only 1 non ending> nondaemon

thread

c% 4untime Error

'*llegalThreadStateException' d%

Compilation error 'ut)%run(" is never

reached'

91 ,hich of the following options is true about multilevelinheritance-

+nswer: a% *nheriting from two super classes

b% *nheriting from a class which is already in an

inheritance hierarchy

c% *nheriting from more than one

super class d% *nheriting from a single

class

9) +nonymous class can have their own members%

State True or ;alse%

True ;alse

9. Consider the following partialcode:

interface + { public int get0alue("$ &

class implements + {

public int get0alue(" { return 1$ &

&


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class C extends {

when inserted

individually at the commented line ( C c)" {c1%get0alue("$ &

d% public void add(C c" { c%get0alue("$ &

e% public void add(+ a> b" {a%get0alue("$ &

99 ;rom /FV 1%8> which of the following interfaces is also

implemented by =ava%util%Treeap class-

+nswer: a%5avigableap

97 Consider the following code snippet:

class

5ode {

5ode

node$

&

class 5odeChain {

public static void main(String a!" {

b%

5avigableSe

t c%

5avigableKis

t d% FeJue


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5ode node1 # new 5ode("$

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