OCP: Java SE 11 Certification (1Z0-819) Practice Test 8

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Welcome to your Java Test - 8

Name

Phone

Question: What will be printed when the following code is compiled and run?

package trywithresources;

import java.io.IOException;

public class Device implements AutoCloseable{
String header = null;
public void open(){
header = "OPENED";
System.out.println("Device Opened");
}
public String read() throws IOException{
throw new IOException("Unknown");
}

public void writeHeader(String str) throws IOException{
System.out.println("Writing : "+str);
header = str;
}
public void close(){
header = null;
System.out.println("Device closed");
}

public static void testDevice(){
try(Device d = new Device()){
d.open();
d.writeHeader("TEST");
d.close();
}catch(IOException e){
System.out.println("Got Exception");
}
}
public static void main(String[] args) {
Device.testDevice();
}

}

Select 1 option(s)

Device Opened
Device closed
Got Exception

Device Opened
Writing : TEST
Device closed
Device closed

Device Opened
Writing : TEST
Device closed
Got Exception

Device Opened
Writing : TEST
Device closed
Device closed
Got Exception

Device Opened
Writing : TEST
Device closed
Device closed
(an exception stack trace)

None

Question: What will be the result of attempting to run the following program?

public class StringArrayTest{
public static void main(String args[]){
String[][][] arr = {
{ { "a", "b" , "c"}, { "d", "e", null } },
{ {"x"}, null },{{"y"}},{ { "z","p"}, {}
}
};
System.out.println(arr[0][1][2]);
}
}

Select 1 option(s)

It will throw NullPointerBoundsException.

It will throw ArrayIndexOutOfBoundsException.

It will print null.

It will run without any error but will print nothing.

None of the above.

None

Question: What will the following code fragment print?

Path p1 = Paths.get("photos/goa");
Path p2 = Paths.get("/index.html");
Path p3 = p1.relativize(p2);
System.out.println(p3);

Select 1 option(s)

..\index.html

\index.html

\photos\index.html

\photos\goa\index.html

java.lang.IllegalArgumentException will be thrown

None

Question: Consider the following code:

import java.util.ArrayList;

public class Student{

ArrayList scores;
private double average;

public ArrayList getScores(){ return scores; }

public double getAverage(){ return average; }

private void computeAverage(){
//valid code to compute average
average =//update average value
}

public Student(){
computeAverage();
}

//other code irrelavant to this question not shown

}

What can be done to improve the encapsulation of this class?

Select 2 option(s)

Make the class private.

Make the scores instance field private.

Make getScores() protected.

Make computeAverage() public.

Change getScores to return a copy of the scores list:
public ArrayList< Integer > getScores(){
return new ArrayList(scores);
}

Question: What will the following code print when run?

import java.nio.file.Path;
import java.nio.file.Paths;
public class PathTest {
public static void main(String[] args) {
var p1 = Paths.get("c:\\code\\java\\PathTest.java");
System.out.println(p1.getName(3).toString());
}
}

Select 1 option(s)

It will throw NullPointerException

It will throw IllegalArgumentException

It will throw InvalidArgumentException

It will throw ArrayIndexOutOfBoundsException

None

Question: Given the following code:

interface Movable{
int offset = 100;
public void move(int dx);
}
interface Growable{
public void grow(int dy);
}

class Animal implements Movable, Growable{
public void move(int dx){ }
public void grow(int dy){ }
}

Select 1 option(s)

Animal class illustrates Java's support for multiple inheritance of type.

Animal class illustrates Java's support for multiple inheritance of state.

Animal class illustrates Java's support for multiple inheritance of type as well as state.

Animal class illustrates Java's support for multiple implementation inheritance.

None

Question: Given that Book is a valid class with appropriate constructor and getPrice and getTitle methods that returns a double and a String respectively, consider the following code:

List<List> books = Arrays.asList(
Arrays.asList(
new Book("Windmills of the Gods", 7.0),
new Book("Tell me your dreams",9.0) ),
Arrays.asList(
new Book("There is a hippy on the highway", 5.0),
new Book("Easy come easy go", 5.0)) );

double d = books.stream()
INSERT CODE HERE //1
INSERT CODE HERE //2
.sum();
System.out.println(d);

What can be inserted in the above code so that it will print 26.0?

Select 1 option(s)

None

Question: What will the following code print when run?

import java.io.Reader;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;

public class MarkTest {

public static void main(String[] args) {

try (Reader r = new BufferedReader(new FileReader("c:\\temp\\test.txt"))) {
if (r.markSupported()) {
BufferedReader in = (BufferedReader) r;
System.out.print(in.readLine());
in.mark(100);
System.out.print(in.readLine());
System.out.print(in.readLine());
in.reset();
System.out.print(in.readLine());
in.reset();
System.out.println(in.readLine());
}else{
System.out.println("Mark Not Supported");
}
} catch (IOException e) {
e.printStackTrace();
}
}
}

Assume that the file test.txt contains:
A
B
C
D
E

Select 1 option(s)

Mark Not Supported

ABCB
< exception stack trace >

ABC
< exception stack trace >

ABCBB

ABCBD

None

Question: What will the following program print when run?

public class ChangeTest {

private int myValue = 0;

public void showOne(int myValue){
myValue = myValue;
}

public void showTwo(int myValue){
this.myValue = myValue;
}
public static void main(String[] args) {
var ct = new ChangeTest();
ct.showTwo(200);
System.out.println(ct.myValue);
ct.showOne(100);
System.out.println(ct.myValue);
}
}

Select 1 option(s)

0 followed by 100.

100 followed by 100.

0 followed by 200.

100 followed by 200.

200 followed by 200.

200 followed by 100

None

10.

Question: Identify the correct statements regarding the following program?

package trywithresources;

import java.io.IOException;

public class Device implements AutoCloseable{
String header = null;
public Device(String name) throws IOException{
header = name;
if("D2".equals(name)) throw new IOException("Unknown");
System.out.println(header + " Opened");
}

public String read() throws IOException{
return "";
}

public void close(){
System.out.println("Closing device "+header);
throw new RuntimeException("RTE while closing "+header);
}

public static void main(String[] args) throws Exception {
try(Device d1 = new Device("D1");
Device d2 = new Device("D2")){
throw new Exception("test");
}
}

}

Select 1 option(s)

It will end up with an Exception containing message "test".

It will end up with a RuntimeException containing message "RTE while closing D1"

It will end up with an IOException containing message "Unknown".

It will end up with a RuntimeException containing message "RTE while closing D1" and a suppressed IOException containing message "Unknown".

None

11.

Question: Consider the following class...

public class ParamTest {
public static void printSum(int a, int b){
System.out.println("In int "+(a+b));
}

public static void printSum(Integer a, Integer b){
System.out.println("In Integer "+(a+b));
}

public static void printSum(double a, double b){
System.out.println("In double "+(a+b));
}

public static void main(String[] args) {
printSum(1, 2);
}
}

What will be printed?

Select 1 option(s)

In int 3

In Integer 3

In double 3.0

In double 3

It will not compile.

None

12.

Question: What can be inserted in the following code so that it will print 12?

public class TestClass{
interface Doer{
String doIt(int x, String y);
}
public static void main(String[] args) {

INSERT CODE HERE

System.out.println(d.doIt(2, "12345"));
}
}

Select 2 option(s)

int a; String b;
Doer d = (a, b)->b.substring(0, a);

int a = 0; String b = "";
Doer d = (a, b)->b.substring(0, a);

Doer d = (a, b)->b.substring(0, a);

Doer d = (int a, String b)->b.substring(0, a);

Doer d = a, b->b.substring(0, a);

13.

Question: What will be the result of compilation and execution of the following code ?

DoubleStream is = DoubleStream.of(0, 2, 4); //1
double sum = is.filter( i->i%2 != 0 ).sum(); //2
System.out.println(sum); //3

Select 1 option(s)

It will print 0.0

It will print 6.0

It will print OptionalDouble[0.0] if line at //2 is replaced with OptionalDouble x = is.sum();

It will not compile.

It will throw an exception at run time.

None

14.

Question: What will the following program print when compiled and run?

class Game{
public void play() throws Exception{
System.out.println("Playing...");
}
}

public class Soccer extends Game{
public void play(){
System.out.println("Playing Soccer...");
}
public static void main(String[] args){
Game g = new Soccer();
g.play();
}
}

Select 1 option(s)

It will not compile.

It will throw an Exception at runtime.

Playing Soccer...

Playing...

None of these.

None

15.

Question: Identify correct statements about the modular JDK.

Select 3 option(s)

Modular JDK allows modular as well as non-modular applications to co-exist.

Modular JDK facilitates aggressive API deprecation.

With modular JDK it is possible to assemble and optimize a set of modules and their dependencies into a custom runtime image.

Modular JDK allows a module to export a package only to a specific module as well.

The foundational APIs of the Java SE platform are in java.lang module.

16.

Question: Given the following class definitions, the expression

(obj instanceof A) && ! (obj instanceof C) && ! (obj instanceof D)

correctly identifies whether the object referred to by obj was created by instantiating class B rather than classes A, C and D?

class A {}
class B extends A {}
class C extends B {}
class D extends C {}

Select 1 option(s)

True

False

None

17.

Question: What will the following code print when compiled and run?

import java.util.*;
public class TestClass {
public static void main(String[] args) throws Exception {
List al = new ArrayList(); //1
al.add(111); //2
System.out.println(al.get(al.size())); //3
}
}

Select 1 option(s)

It will not compile.

It will throw an exception at run time because of line //1

It will throw an exception at run time because of line //2

It will throw an exception at run time because of line //3

null.

None

18.

Question: What will the following program print when compiled and run?

class Data {
private int x = 0;
private String y = "Y";
public Data(int k){
this.x = k;
}
public Data(String k){
this.y = k;
}
public void showMe(){
System.out.println(x+y);
}
}
public class TestClass {
public static void main(String[] args) throws Exception {
new Data(10).showMe();
new Data("Z").showMe();
}
}

Select 1 option(s)

0Z
10Y

10Y
0Z

It will not compile.

It will throw an exception at run time.

None

19.

Question: Given:

interface Identifier{
int id();
}

sealed class Person
permits Student //LINE A
{
}

record Student(int id,
String subject)

extends Person //LINE B

implements Identifier //LINE C
{
public static final long serialVersionUID = 1L; //LINE D

private String name = "unknown"; //LINE E

String name(){ return "unknown"; } //LINE F

public int id(){ return id; } //LINE G
}

Which lines will cause compilation issues?

Select 3 option(s)

LINE A

LINE B

LINE C

LINE D

LINE E

LINE F

LINE G

20.

Question: Consider the following program:

public class TestClass{
public static void main(String[] args) { calculate(2); }
public static void calculate(int x){
String val;
switch(x){
case 2:
default:
val = "def";
}
System.out.println(val);
}
}

What will happen if you try to compile and run the program?

Select 2 option(s)

It will not compile saying that variable val may not have been initialized..

It will compile and print def

As such it will not compile but it will compile if calculate(2); is replaced by calculate(3);

It will compile for any int values in calculate(...);

21.

Question: What will the following code print?

String s1 = """
a \
b \t
c \s
""";
System.out.println(s1.length()+" "+s1.split("\\n").length);

Select 1 option(s)

11 3

12 3

11 4

10 2

10 3

9 2

None

22.

Question: Consider the following code written to generate a report containing customer data where each line is a pipe separated list of values.

String qr = "select EMAILID, NAME, PHONE from CUSTOMER order by EMAILID";
PreparedStatement stmt = connection.prepareStatement(qr);
ResultSet rs = stmt.executeQuery(); //LINE 10
while(rs.next()){
System.out.println(rs.getString(0)+"|"+rs.getString(1)+"|"+rs.getString(3));
}
connection.close();

Identify the correct statement about this code.

(Assume that items not specified such as import statements and try/catch block are all valid.)

Select 1 option(s)

It will throw an exception when run if there is at least 1 record in the table.

It will throw an exception when run if there are no records in the table.

It will print the data as expected.

It will not compile.

None

23.

Question: Which of the given statements are correct for a method that overrides the following method:

public Set getSet(int a) {...}

Assume that Set is an interface and HashSet is a class that implements Set.

Select 3 option(s)

Its return type must be declared as Set.

It may return HashSet.

It can declare any Exception in throws clause

It can declare any RuntimeException in throws clause.

It can be abstract.

24.

Question: What will the following code print when run?

LocalDate d = LocalDate.now();
java.time.format.DateTimeFormatter df = new java.time.format.DateTimeFormat(FormatStyle.LONG);
System.out.println(df.format(d));

Select 1 option(s)

It will print current date in LONG format.

It will print the number of milliseconds since 1 Jan 1970.

It will not compile.

It will throw an exception at runtime.

None

25.

Question: Given:

class TestClass{
public static void main(String[] args) throws Exception {

List list = new CopyOnWriteArrayList();
ExecutorService es = Executors.newFixedThreadPool(5);
CyclicBarrier cb = new CyclicBarrier(2, ()->System.out.print("All Done"));

IntStream.range(0, 5).forEach(n->es.execute(
()->{
try{
list.add(n);
cb.await();
}catch(InterruptedException|BrokenBarrierException e){
System.out.println("Exception");
}
}
));
es.shutdown();
}
}

What will the above program print?

Select 2 option(s)

It will print "All Done" once.

It will print "All Done" twice.

It will never print "All Done".

It will print "All Done" once and end.

It may print "All Done" once or twice.

The program will not end.

The program will end.

26.

Question: The following class will print 'index = 2' when compiled and run.

class Test{
public static int[ ] getArray() { return null; }
public static void main(String[] args){
var index = 1;
try{
getArray()[index=2]++;
}
catch (Exception e){ } //empty catch
System.out.println("index = " + index);
}
}

Select 1 option(s)

True

False

None

27.

Question: What will the following code print?

Duration d = Duration.ofMillis(1100);
System.out.println(d);
d = Duration.ofSeconds(61);
System.out.println(d);

Select 1 option(s)

PT1S
PT1M1S

PT1S1m
PT1M1S

PT1.1S
PT61S

PT1.1S
PT1M1S

None

28.

Question: What is the result of executing the following fragment of code:

var b1 = false;
var b2 = false;
if (b2 = b1 == false){
System.out.println("true");
} else{
System.out.println("false");
}

Select 1 option(s)

Compile time error.

It will print true

It will print false

Runtime error.

It will print nothing.

None

29.

Question: Your application was developed and packaged on the Java 8 platform as a jar file. It consists of the following packages:

com.abc.stocks
com.abc.stocks.valuation
com.abc.stocks.analytics
com.abc.bonds
com.abc.bonds.valuation
com.abc.bonds.analytics
com.abc.derivatives
com.abc.derivatives.valuation
com.abc.derivatives.analytics

You are now trying to modularize it into three different modules. Which of the following module descriptions could potentially be valid?

Select 1 option(s)

module com.abc.stocks{
provides com.abc.stocks.analytics;
}
module com.abc.bonds{
provides com.abc.bonds.analytics;
}
module com.abc.derivatives{
provides com.abc.derivatives.analytics;
}

module com.abc.stocks{
exports com.abc.stocks.analytics;
}
module com.abc.bonds{
exports com.abc.bonds.analytics;
}
module com.abc.derivatives{
exports com.abc.derivatives.analytics;
}

module com.abc.stocks{
opens com.abc.stocks.analytics;
}
module com.abc.bonds{
opens com.abc.bonds.analytics;
}
module com.abc.derivatives{
opens com.abc.derivatives.analytics;
}

module com.abc.stocks{
uses com.abc.stocks.valuation;
uses com.abc.stocks.analytics;
}
module com.abc.bonds{
uses com.abc.bonds.valuation;
uses com.abc.bonds.analytics;
}
module com.abc.derivatives{
uses com.abc.derivatives.valuation;
uses com.abc.derivatives.analytics;
}

None

30.

Question: Given the following exception classes:

class MyException extends Exception{}
class MyException1 extends MyException{}
class MyException2 extends MyException{}
class MyException3 extends MyException2{}

and the following code:

try{
//code that could potentially throw any of the above mentioned exceptions
}
INSERT CODE HERE

Which of the following options can be inserted in the above code?

Select 1 option(s)

catch(MyException|MyException3 e){ }

catch(MyException3 me3){ }
catch(Exception e){ }

catch(MyException2 me2){ }
catch(MyException3 me3){ }

catch(Throwable t){ }
catch(MyException3 me3){ }

catch(MyException|MyException1|MyException2|MyException3 e){ }

None

31.

Question: Your group has an existing application (reports.jar) that uses a library (analytics.jar) from another group in your company. Both - the application and the library - use a JDBC driver packaged in ojdbc8.jar.

Which of the following options describes the steps that will be required to modularize your application?

Select 1 option(s)

1. Convert analytics.jar and ojdbc8.jar into automatic modules
2. Convert reports.jar into a named module.
3. Add requires clauses for analytics and ojdbc8 in reports.jar in its module-info.java.

1. Modularize analytics.jar and ojdbc8.jar into modules by adding module-info.java to these jars.
2. Convert reports.jar into a named module.
3. Add requires clauses for all packages contained in analytics.jar and ojdbc8.jar that are directly referred to by classes in reports.jar in its module-info.java

1. Convert reports.jar into a named module.
2. Add requires clauses for analytics and ojdbc8 modules in reports.jar in its module-info.java.
3. Use analytics.jar and ojdbc8.jar as unnamed modules.

1. Convert ojdbc8.jar into automatic module.
2. Convert analytics.jar into a named module by adding module-info.java to it. In this module-info, export all packages that are used by reports.jar and add requires clauses for all packages of ojdbc.jar that are used by analytics.jar.
3. Convert reports.jar into a named module. Add requires clause for analytics module in reports's module-info.java.

None

32.

Question: Which of the following lambda expressions can be used to implement a Function ?

Select 1 option(s)

(a)-> 2*a

(a, s)-> a+" "+s

(s) ->"hello "+s+"!"

(a, s, r)-> a+" "+s

(a)-> System.out.println("done")

None

33.

Question: Which functional interface(s) would you use if you need a function that always returns the same type as the type of its input(s)?

Select 2 option(s)

Function

UnaryOperator

Supplier

Predicate

BinaryOperator

Consumer

BiConsumer

34.

Question: What will be the output of the following program?

public class TestClass{
public static void main(String args[ ] ){
int i = 0 ;
boolean bool1 = true ;
boolean bool2 = false;
boolean bool = false;
bool = ( bool2 & method1(i++) ); //1
bool = ( bool2 && method1(i++) ); //2
bool = ( bool1 | method1(i++) ); //3
bool = ( bool1 || method1(i++) ); //4
System.out.println(i);
}
public static boolean method1(int i){
return i>0 ? true : false;
}
}

Select 1 option(s)

It will print 1.

It will print 2.

It will print 3.

It will print 4.

It will print 0.

None

35.

Question: Consider the following code:

class Outsider
{
public class Insider{ }
}
public class TestClass
{
public static void main(String[] args)
{
var os = new Outsider();
// 1 insert line here
}
}

Which of the following options can be inserted at //1?

Select 1 option(s)

Insider in = os.new Insider();

os.Insider in = os.new Insider();

Outsider.Insider in = os.new Insider();

Insider in = Outsider.new Insider();

None

36.

Question: Given the following code:

Transaction t1 = new Transaction(1, 2); //1

Transaction t2 = new Transaction(1, "2"); //2

It is required that //1 must compile and //2 must NOT compile. Which of the following declarations of class Transaction will satisfy the requirement?

Select 1 option(s)

None

37.

Question: Consider the following code appearing in the same file:

class Data {
private int x = 0, y = 0;
public Data(int x, int y){
this.x = x; this.y = y;
}
}
public class TestClass {
public static void main(String[] args) throws Exception {
Data d = new Data(1, 1);
//add code here
}
}
Which of the following options when applied individually will change the Data object currently referred to by the variable d to contain 2, 2 as values for its data fields?

Select 1 option(s)

Add the following two statements :
d.x = 2;
d.y = 2;

Add the following statement:
d = new Data(2, 2);

Add the following two statements:
d.x += 1;
d.y += 1;

Add the following method to Data class:
public void setValues(int x, int y){
this.x.setInt(x); this.y.setInt(y);
}

Then add the following statement:
d.setValues(2, 2);

Add the following method to Data class:
public void setValues(int x, int y){
this.x = x; this.y = y;
}

Then add the following statement:
d.setValues(2, 2);

None

38.

Question: What will the following code print when compiled and run?

public class TestClass{

public static int operate(IntUnaryOperator iuo){
return iuo.applyAsInt(5);
}

public static void main(String[] args) {

IntFunction fo = a->b->a-b; //1

int x = operate(fo.apply(20)); //2
System.out.println(x);
}
}

Select 1 option(s)

Compilation error at //1

Compilation error at //2

-15

Exception at run time

None

39.

Question: Which of the following interface definitions can use Lambda expressions?

Select 2 option(s)

interface A{
}

interface A{
default void m(){};
}

interface A{
void m(){};
}

interface A{
default void m1(){};
void m2();
}

interface A{
void m1();
void m2();
}

sealed interface A permits B{
void m();
}
non-sealed interface B extends A{ }

40.

Question: What will the following code print?

List s1 = new ArrayList();
String s = null;
s1.add("a");
s1.add(s); //1
s1.add("b");
s1.remove(s); //2
System.out.println(s1); //3

Select 1 option(s)

A NullPointerException will be thrown at line marked //1.

A NullPointerException will be thrown at line marked //2.

A NullPointerException will be thrown at line marked //3.

[a, b]

[a, null, b]

[]

None

41.

Question: Which of the following four constructs are valid?

1.
switch(5)
{
default :
}

2.
switch(5)
{
default : break;
}

3.
switch(8);

4.
var x = 0;
switch(x){
}

5.
public int switchTest(byte x){
return switch(x){
default -> 0;
case '1' -> 1;
};
}

Select 1 option(s)

1, 3, 5

1, 2, 3

3, 4

1, 2, 4, 5

All are valid.

None

42.

Question: What will the following code print when compiled and run?

HashSet keys = new HashSet(List.of("a", "b", "c"));
ArrayList values = new ArrayList(Set.of("1", "2", "3"));

Map m = new HashMap();
int i = 0;
for(var key : keys){
m.put(key, values.get(i++));
}
keys.clear(); //2
values.clear();
System.out.println(m.keySet().size()+" "+m.values().size());

Select 1 option(s)

It will throw an java.lang.UnsupportedOperationException.

0 0

3 3

It will not compile.

None

43.

Question: Consider the following classes:

class A {
public int getCode(){ return 2;}
}

class AA extends A {
public void doStuff() {
}
}
Given the following two declarations, which of the options will compile?
A a = null;
AA aa = null;

Select 4 option(s)

a = (AA)aa;

a = new AA();

aa = new A();

aa = (AA) a;

aa = a;

((AA)a).doStuff();

44.

Question: Given:

ArrayList source = new ArrayList();
source.addAll(Arrays.asList(1, 2, 3, 4, 5, 6));

List destination =
Collections.synchronizedList(new ArrayList());

source
.parallelStream() //1
.peek(item->{destination.add(item); }) //2
.forEachOrdered(System.out::print);
System.out.println("");
destination
.stream() //3
.forEach(System.out::print); //4
System.out.println("");

What changes must be made to the above code so that it will consistently print
123456
123456
?

Select 1 option(s)

Replace code at //1 with
.stream()

Replace code at //2 with
.map(item->{destination.add(item); return item; })

Replace code at //3 with
.parallelStream()

Replace code at //4 with
.forEachOrdered(System.out::print);

None

45.

Question: What will the following code fragment print?

Path p1 = Paths.get("\\personal\\readme.txt");
Path p2 = Paths.get("\\index.html");
Path p3 = p1.relativize(p2);
System.out.println(p3);

Select 1 option(s)

\index.html

\personal\index.html

personal\index.html

..\..\index.html

None

46.

Question: Identify valid statements.

Select 3 option(s)

Locale myLocale = System.getDefaultLocale();

Locale myLocale = Locale.getDefaultLocale();

Locale myLocale = Locale.getDefault();

Locale myLocale = Locale.US;

Locale myLocale = Locale.getInstance();

Locale myLocale = new Locale("ru", "RU");

47.

Question: Consider the following code:

public class FileCopier {
public static void copy(String records1, String records2) {
try (
InputStream is = new FileInputStream(records1);
OutputStream os = new FileOutputStream(records2); ) { //1

if(os == null) os = new FileOutputStream("c:\\default.txt"); //2

byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) { //3
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
} catch (IOException e) { //4
e.printStackTrace();
}
}

public static void main(String[] args) {
copy("c:\\temp\\test1.txt", "c:\\temp\\test2.txt");
}
}

Assuming appropriate import statements and the existence of both the files, what will happen when the program is compiled and run?

Select 1 option(s)

The program will not compile because the try statement is used incorrectly.

The program will not compile because the catch clause is used incorrectly.

The program will not compile because line //2 is invalid.

It will compile and run without any error or exception.

None

48.

Question: What will be the result of attempting to compile and run the following program?

public class TestClass{
public static void main(String args[ ] ){
Object a, b, c ;
a = new String("A");
b = new String("B");
c = a;
a = b;
System.out.println(""+c);
}
}

Select 1 option(s)

The program will print java.lang.String@XXX, where XXX is the memory location of the object a.

The program will print A

The program will print B

The program will not compile because the type of a, b, and c is Object.

The program will print java.lang.String@XXX, where XXX is the hash code of the object a.

None

49.

Question: Given:

int[][] orig = { { 1, 2, 3} , { 4, 5, 6, 7}};
int[][] dup = orig.clone();
int[] copy = dup[0].clone();

System.out.println(orig == dup);
System.out.println(orig.equals(dup));
System.out.println(orig[0] == dup[0]);
System.out.println(dup[0] == copy);
System.out.println(dup[0].equals(copy));

How many times will true be printed?

Select 1 option(s)

None

50.

Question: What will the following code print when run?

Deque d = new ArrayDeque();
d.add(1);
d.add(2);
d.addFirst(3);
System.out.println(d.pollLast());
System.out.println(d.pollLast());
System.out.println(d.pollLast());

Select 1 option(s)

1
2
3

3
2
1

3
1
2

2
1
3

Exception at run time

It will not compile.

None

51.

Question: What will the following code fragment print?

Path p1 = Paths.get("c:\\personal\\.\\photos\\..\\readme.txt");
Path p2 = p1.normalize();
System.out.println(p2);

Select 1 option(s)

readme.txt

c:\personal\photos\readme.txt

c:\personal\readme.txt

c:\photos\readme.txt

None

52.

Question: You have an existing java application that contains the following packages -

com.acme.provisioning.client
com.acme.provisioning.service
com.acme.provisioning.dto
com.acme.provisioning.database

The dependency of classes in these packages is as follows -

Classes in the client package use classes from the service and the dto package.
Classes in the service package use classes from the dto and the database package
Classes in the database package use classes from the dto package.
Classes in the dto package do not use classes from any other package.

You want to modularize the application into three modules - client, service, and dto.

Which of the following would be a valid module-info for the service module?

Select 1 option(s)

module acme.provisioning.service{
exports com.acme.provisioning.service;
exports com.acme.provisioning.database;
requires acme.provisioning.dto;
}

module acme.provisioning.service{
exports com.acme.provisioning.service;
requires acme.provisioning.dto;
}

module acme.provisioning.service{
exports com.acme.provisioning.service;
requires com.acme.provisioning.database;
requires acme.provisioning.dto;
}

Since there are four interdependent packages in the app, it cannot be modularized into three modules.

None

53.

Question: What will the following program print?

public class TestClass{
public static void main(String[] args){
Object obj1 = new Object();
Object obj2 = obj1;
if( obj1.equals(obj2) ) System.out.println("true");
else System.out.println("false");
}
}

Select 1 option(s)

true

false

It will not compile.

It will compile but throw an exception at run time.

None of the above.

None

54.

Question: Given:

public class ValueHolder{
final int value;

*INSERT CODE HERE*

}

Which of the following options can be inserted in the above code independent of each other?

Select 2 option(s)

public ValueHolder() { value = 10; }
public void ValueHolder(int x) { value = x; }

public int ValueHolder(String s) { value = Integer.parseInt(s); }

public ValueHolder(){ this("10"); }
public ValueHolder(String x) { value = Integer.parseInt(x, 2); }

public ValueHolder(int x) { value = x; }

public ValueHolder(){ this("1_0"); }
public ValueHolder(String x) { value = Integer.valueOf(x); }

55.

Question: Consider the following code:

//Assume appropriate imports
class Person{
String name;
String dob;
public Person(String name, String dob){
this.name = name; this.dob = dob;
}
}
public class SortTest {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add(new Person("Paul", "01012000"));
al.add(new Person("Peter", "01011990"));
al.add(new Person("Patrick", "01012002"));

//INSERT CODE HERE

for(Person a : al) System.out.println(a.name+" "+ a.dob);
}
}

What can be inserted in the code so that it will sort the collection of Persons by Person's dob attribute?

Select 1 option(s)

None

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