Java Test 13 - 2024

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Welcome to your Java Test - 13 - 2024

Name

Phone

Q1. What will the following code print?

public class Test{
public static void stringTest(String s){
s.replace("h", "s");
}
public static void stringBuilderTest(StringBuilder s){
s.append("o");
}
public static void main(String[] args){
String s = "hell";
StringBuilder sb = new StringBuilder("well");
stringTest(s);
stringBuilderTest(sb);
System.out.println(s + sb);
}
}

You had to select 1 option(s)

sellwello

hellwello

hellwell

sellwell

None of these.

None

Q2. What will be the output when the following program is run?

public class TestClass{
char c;
public void m1(){
char[ ] cA = { 'a' , 'b'};
m2(c, cA);
System.out.println( ( (int)c) + "," + cA[1] );
}
public void m2(char c, char[ ] cA){
c = 'b';
cA[1] = cA[0] = 'm';
}
public static void main(String args[]){
new TestClass().m1();
}
}

You had to select 1 option(s)

Compile time error.

0,m

b,b

b,m

None

Q3. Which of the following are valid code snippets appearing in a method:

You had to select 3 option(s)

var a = b = c = 100;

var a = 100, b = 10;
var a = b;

int a, b, c=100;

int a=100, b, c;

int a = 100 = b = c;

int a = b = c = 100;

int a, b, c; a = b = c = 100;

Q4. What will the following code print when compiled and run?

List values = Arrays.asList("Java EE", "C#", "Python");
boolean flag = values.stream().allMatch(str->{
System.out.println("Testing: "+str);
return str.equals("Java");
});
System.out.println(flag);

You had to select 1 option(s)

Testing: Java EE
false

Testing: Java EE
Testing: C#
Testing: Python
false

Testing: Java EE
true

It will not compile because lambda expression is built incorrectly.

None

Q5. Which of the following lines will cause the compilation to fail?

interface I { }

public enum EnumA implements I, Serializable { A, AA, AAA}; //1

class TestClass
{
public enum EnumB{ B, BB, BBB;
public Object clone(){ return B; } //2
}

public static enum EnumC{ C, CC, CCC };

public static enum EnumD extends EnumC{ DDD }; //3

public TestClass()
{
System.out.println(EnumC.CC.index()); //4
}

public static void main(String[] args)
{
System.out.println(EnumC.valueOf("ccc")); //5
System.out.println(EnumC.CCC.name()); //6
System.out.println(EnumC.CCC.ordinal()); //7
}
}

You had to select 3 option(s)

Q6. Given:

class Buddy {
public Buddy(){ }
}
public class GCTest
public static void initBuddies(Buddy[] ba){
ba[0] = new Buddy(); //1
ba[1] = new Buddy(); //2
ba[0] = ba[1]; //3
ba[1] = ba[2]; //4
}

public static void main(String[] args) {
Buddy[] ba = new Buddy[3]; //5
initBuddies(ba); //6

//7

}
}

How many Buddy objects will be eligible for garbage collection at line marked //7?

You had to select 1 option(s)

None

Q7. Which of the following illustrates a good coding practice given that the database connection is to be reused?

You had to select 1 option(s)

try(Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select * from STUDENT"); )
{
while(rs.next()){
//do something with the row
}
}

try(Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select * from STUDENT"); ) {
while(rs.next()){
//do something with the row
}
}
finally{
rs.close();
stmt.close();
}

try(Statement stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select * from STUDENT"); ) {
while(rs.next()){
//do something with the row
}
}
catch(SQLException e){
}

Statement stmt = null;
ResultSet rs = null;
try{
stmt = connection.createStatement();
ResultSet rs = stmt.executeQuery("select * from STUDENT");
while(rs.next()){
//do something with the row
}
}
finally{
rs.close(); stmt.close();
}

None

Q8. Which of the following are correct ways to initialize the static variables MAX and CLASS_GUID ?

class Widget{
static int MAX; //1
static final String CLASS_GUID; // 2
Widget(){
//3
}
Widget(int k){
//4
}
}

You had to select 2 option(s)

Modify lines //1 and //2 as : static int MAX = 111; static final String CLASS_GUID = "XYZ123";

Add the following line just after //2 : static { MAX = 111; CLASS_GUID = "XYZ123"; }

Add the following line just before //1 : { MAX = 111; CLASS_GUID = "XYZ123"; }

Add the following line at //3 as well as //4 : MAX = 111; CLASS_GUID = "XYZ123";

Only option 3 is valid.

Q9. Your application consists of two jar files produced by two different teams - accounting-3.2.jar and reporting-5.6.jar. Classes in reporting-5.6.jar use the class com.abc.account.Account in accounting-3.2.jar while classes in accounting-3.2.jar do not refer to classes from reporting-5.6.jar.

The accounting team has decided to modularize their jar. Which of the following would be a valid module-info.java for the new accounting-3.3.jar?

You had to select 1 option(s)

module accounting{
requires com.abc.account;
}

module accounting{
export com.abc.account.*;
}

module accounting{
exports com.abc.account;
}

module accounting{
export com.abc.account;
}

module accounting{
export com.abc.account.Account;
}

module accounting{
provides com.abc.account;
}

None

Q10. Consider the following piece of code:

Locale.setDefault(new Locale("fr", "CA")); //Set default to French Canada
Locale l = new Locale("jp", "JP");
ResourceBundle rb = ResourceBundle.getBundle("appmessages", l);
String msg = rb.getString("greetings");
System.out.println(msg);

You have created two resource bundle files with the following contents:

#In appmessages.properties:
greetings=Hello

#In appmessages_fr_FR.properties:
greetings=bonjour

Given that this code is run on machines all over the world. Which of the following statements are correct?

You had to select 1 option(s)

It will throw an exception when the default locale of the machine where it is run is different from fr/FR and fr/CA.

It will throw an exception where ever it is run.

It will throw an exception when the default locale of the machine is fr/CA.

It will throw an exception when the default locale of the machine is jp/JP.

It will run without any exception all over the world.

None

Q11. Given the following module definitions:

module m${
requires _n;
exports o;
}

module _n{
requires m$;
exports p;
}

Identify the correct statements.

You had to select 1 option(s)

The definitions are invalid because of circular dependency.

The definitions are invalid because the package names in the export clauses are invalid.

The definitions are invalid because the modules names are invalid.

The definitions are invalid because they don't declare dependency on java.base module.

The definitions are invalid because of circular dependency as well as ommission of requires java.base;.

None

Q12. What will the following code print?

public static void main(String[] args) {
Integer x = 3;
switch(x){
case 1, 2 -> System.out.println("A");
case 3, 4 -> System.out.println("B");
default -> System.out.println("C");
}
}

You had to select 1 option(s)

B
C

It will not compile.

It will compile but will not print anything.

None

Q13. Given a class named Test, which of these would be valid definitions for a constructor for the class?

You had to select 1 option(s)

Test(Test b) { }

Test Test( ) { }

private final Test( ) { }

void Test( ) { }

public static void Test(String args[ ] ) { }

None

Q14. Given:

Map<String , List> stateCitiesMap =
new HashMap<String, List>();

Which of the following options correctly achieves the same or compatible declaration using type inference?

You had to select 2 option(s)

Q15. Which of the statements regarding the given code are correct?

public class Test extends Thread
{
static Object obj1 = new Object();
static Object obj2 = new Object();
public void m1()
{
synchronized(obj1)
{
System.out.print("1 ");
synchronized(obj2)
{
System.out.println("2");
}
}
}
public void m2()
{
synchronized(obj2)
{
System.out.print("2 ");
synchronized(obj1)
{
System.out.println("1");
}
}
}
public void run()
{
m1();
m2();
}
public static void main(String[] args)
{
new Test().start();
new Test().start();
}
}

You had to select 1 option(s)

It may result in a deadlock and the program might get stuck.

There is no potential for deadlock.

Deadlock may occur but the program will not get stuck as the JVM will resolve the deadlock.

The program will always print 1 2, 2 1, 1 2 and 21

None

Q16. What will the following code print when compiled and run?

interface Eatable{
int types = 10;
}
class Food implements Eatable {
public static int types = 20;
}
public class Fruit extends Food implements Eatable{ //LINE1

public static void main(String[] args) {
types = 30; //LINE 2
System.out.println(types); //LINE 3
}
}

You had to select 1 option(s)

Compilation failure at //LINE 1.

Compilation failure at //LINE 2.

Compilation failure at //LINE 3.

Compilation failure at //LINE 2 as well as at //LINE 3

None

Q17. Consider the following code:

interface Classic {
int version = 1;
public void read() ;
}

class MediaReader implements Classic{
int version = 2;
public void read() {

//Insert code here

}
}

public class ReaderTest{
public static void main(String[] args) {
MediaReader mr = new MediaReader();
mr.read();
}
}

What can be inserted in the code above so that it will print 1 when run?

You had to select 1 option(s)

System.out.println(version);

System.out.println((Classic)version);

System.out.println(((Classic)this).version);

System.out.println(this.Classic.version);

System.out.println(MediaReader.version);

None

Q18. Given:

public class TestClass {
public void myMethod(String... params) {
var a = params;
var b = params[0];
}
}

What are the types of the variables a and b?

You had to select 1 option(s)

Object[] and Object

String[] and Object

String[] and String

List and Object

List and String

None

Q19. What will the following code print when run?

public class TestClass
{
public static void main(String args[])
{
A a = new B();
if( a instanceof B b){
b.b();
}
System.out.println(b);

}
}
class A {
void a(){ System.out.println("a"); }
}
class B extends A {
void b(){ System.out.println("b"); }
}

You had to select 1 option(s)

Compilation failure

null

b
null

None

Q20. Identify correct statements about Java platform module system.

You had to select 2 option(s)

A module is a set of packages that make sense being grouped together and is designed for reuse.

The module system ensures that code that is internal to a platform implementation is not accessible from outside the implementation.

The module system uses only two phases - compile time and run time - for building an application.

All classes in a module are concealed and cannot be accessed by code from other modules. Only interfaces are visibile outside the package.

Q21. Which of the following classes have a default constructor?

class A{ }
class B { B(){ } }
class C{ C(String s){ } }

You had to select 1 option(s)

A and B

B and C

None

Q22. You want to print the date that represents upcoming Tuesday from now even if the current day is a Tuesday. Which of the following lines of code accomplishe(s) this?

You had to select 2 option(s)

System.out.println(LocalDate.now().with(TemporalAdjusters.next(DayOfWeek.TUESDAY)));

System.out.println(LocalDate.now().with(TemporalAdjusters.nextOrSame(DayOfWeek.TUESDAY)));

System.out.println(new LocalDate().with(TemporalAdjusters.next(DayOfWeek.TUESDAY)));

System.out.println(new LocalDate().adjust(TemporalAdjusters.next(DayOfWeek.TUESDAY)));

System.out.println(TemporalAdjusters.next(DayOfWeek.TUESDAY).adjustInto(LocalDate.now()));

Q23. Identify the correct statements about ArrayList?

You had to select 3 option(s)

Standard JDK provides no subclasses of ArrayList.

An ArrayList cannot store primitives.

It allows constant time access to all its elements.

ArrayList cannot resize dynamically if you add more number of elements than its capacity.

An ArrayList is backed by an array.

Q24. Which of the following lines of code that, when inserted at line 1, will make the overriding method in SubClass invoke the overridden method in BaseClass on the current object with the same parameter.

class BaseClass{
public void print(String s) { System.out.println("BaseClass :"+s); }
}
class SubClass extends BaseClass{
public void print(String s){
System.out.println("SubClass :"+s);
// Line 1
}
public static void main(String args[]){
SubClass sc = new SubClass();
sc.print("location");
}
}

You had to select 1 option(s)

this.print(s);

super.print(s);

print(s);

BaseClass.print(s);

None

Q25. Consider the directory structure and its contents shown in the figure.

(c:\temp is a directory that contains two text files - test1.txt and text2.txt)

What should be inserted at //LINE 10 in the following code so that it will write "hello" to text2.txt?

public static void writeData() throws Exception{
var p1 = Paths.get("c:\\temp\\test1.txt");
var p2 = //LINE 10 - INSERT CODE HERE
var bw = new BufferedWriter(new FileWriter(p2.toFile()));
bw.write("hello");
bw.close();
}

You had to select 1 option(s)

p1.resolve("text2.txt");

p1.relativize("c:\\temp\\text2.txt");

p1.resolveSibling("text2.txt");

p1.relativize(Paths.get("text2.txt"));

None

Q26. What will the following code print when compiled and run?

var numA = new Integer[]{1, 2};
var list1 = List.of(numA);
numA[0] = 2;
var list2 = List.copyOf(list1);
System.out.println(list1+" "+list2);

You had to select 1 option(s)

It will not compile.

[1, 2] [1, 2]

[2, 2] [1, 2]

[2, 2] [2, 2]

None

Q27. Given that the user account under which the following code is run does not have the permission to access a.java, what will the the following code print when run?

import java.io.BufferedReader;
import java.io.FileReader;
import java.io.IOException;
import java.nio.file.AccessDeniedException;
import java.nio.file.NoSuchFileException;

public class IOTest {
public static void main(String[] args) {
try(BufferedReader bfr = new BufferedReader(
new FileReader("c:\\works\\a.java"))){
String line = null;
while( (line = bfr.readLine()) != null){
System.out.println(line);
}
}catch(NoSuchFileException|IOException|AccessDeniedException e){
e.printStackTrace();
}
}
}

You had to select 1 option(s)

It will run without any exception and without any output.

It will print a stack trace for AccessDeniedException.

It will print a stack trace for IOException.

It will print a stack trace for NoSuchFileException.

It will not compile because the catch clause is invalid.

It will not compile because AccessDeniedException is not a valid exception class in java.nio.file package.

None

Q28. Given:

abstract class AmazingClass{
void amazingMethod(Collection c){
System.out.println("Got collection");
};
}

public class SpecialAmazingClass extends AmazingClass{
void amazingMethod(List l){
System.out.println("Got list");
};

public static void main(String[] args) {
List al = new ArrayList();
Collection c = al;
AmazingClass ac = new SpecialAmazingClass();
ac.amazingMethod(c);
}
}

What is the output?

You had to select 1 option(s)

Compilation error

Exception at run time.

Got collection

Got list

None

Q29. Given:

String s1 = "Hello World";
String s2 = """
Hello World""";
String s3 = """
Hello World
""";
System.out.println((s1 == s2)+" "+s2.equals(s3)+" "+s2.intern().equals(s3.intern()));

What is the result?

You had to select 1 option(s)

true false true

true true true

false true false

true false false

false false false

None

Q30. Consider the following code:

class A
{
byte getStatusCode(Object obj) throws NullPointerException
{
if(obj != null ) return 128;
else return -1;
}
}
class B extends A
{
//override getStatusCode method.
}

Which of the following statements are valid?

You had to select 3 option(s)

Overriding method cannot throw IOException

Overriding method can throw Throwable

class A will not compile as it is.

Overriding method can throw any exception

Overriding method may choose not to throw any exception.

Q31. What letters will be printed by this program?

public class ForSwitch{
public static void main(String args[]){
char i;
LOOP: for (i=0;i<5;i++){
switch(i++){
case '0': System.out.println("A");
case 1: System.out.println("B"); break LOOP;
case 2: System.out.println("C"); break;
case 3: System.out.println("D"); break;
case 4: System.out.println("E");
case 'E' : System.out.println("F");
}
}
}
}

You had to select 2 option(s)

Q32. Which of the following are valid method implementations?

You had to select 2 option(s)

public void outputText(PrintWriter pw, String text){
try{
pw.write(text);
}catch(IOException e){
System.out.println("exception in writing");
}
}

public void outputText(PrintWriter pw, String text){
pw.write(text);
if(pw.checkError()) System.out.println("exception in writing");
}

public void outputText(PrintWriter pw, String text){
boolean flag = pw.write(text);
if(!flag) System.out.println("exception in writing");
}

public void outputText(PrintWriter pw, String text){
pw.printf(text).print("success");
}

public void outputText(PrintWriter pw, String text){
pw.println(text).println("success");
}

Q33. What will the following code print when run?

import java.nio.file.Path;
import java.nio.file.Paths;

public class PathTest {
static Path p1 = Paths.get("c:\\finance\\data\\reports\\daily\\pnl.txt");

public static void main(String[] args) {
System.out.println(p1.subpath(0, 2));
}
}

You had to select 1 option(s)

finance \ data

finance \ data \

\ finance \ data \ reports

c:\ finance \ data

c:\finance

None

Q34. Given:

Path p = Paths.get("c:\\temp\\out");
try{
var b = Files.deleteIfExists(p);
System.out.println(b);
}catch(Exception e){
e.printStackTrace();
}

Identify correct statements.

You had to select 1 option(s)

It will print "c:\temp\out" if the file referred to by p is not deleted for any reason.

It will print an exception stack trace if p refers to a directory instead of a file.

It will print an exception stack trace if p refers to an empty file or a non-empty directory.

It will print an exception stack trace the file referred to by p does not exist.

It will print true if p refers to an empty directory.

None

Q35. What will the following code print when compiled and run?

List countries = List.of("US", "UK", "India", "Argentina");
List capitals = List.of("Washington DC", "London", "New Delhi" );
Stream is = IntStream
.range(0, Math.min(countries.size(), capitals.size()))
.mapToObj(i->countries.get(i)+" "+capitals.get(i));
is.forEach(System.out::println);

You had to select 1 option(s)

It will not compile.

It will throw an exception at run time.

It will not print anything.

US Washington DC
UK London
India New Delhi

US Washington DC
UK London

None

Q36. Consider the following two classes (in the same package but defined in different source files):

public class Square {
double side = 0;
double area;

public Square(double length){ this.side = length; }

public double getSide() { return side; }

public void setSide(double side) { this.side = side; }

double getArea() { return area; }
}
public class TestClass {
public static void main(String[] args) throws Exception {
Square sq = new Square(10.0);
sq.area = sq.getSide()*sq.getSide();
System.out.println(sq.getArea());
}
}
You are assigned the task of refactoring the Square class to make it better in terms of encapsulation. What changes will you make to this class?

You had to select 2 option(s)

Make setSide() method private.

Make getArea() method private.

Make side and area fields private.

Make the side field private and remove the area field.

Change getArea method to:
public double getArea(){ return side*side; }

Add a setArea() method.

Q37. What will the following code print when compiled and run?

ArrayList als = new ArrayList(List.of("a", "b", "c"));
Set ss = new HashSet();
ss.addAll(als); //1
als.clear(); //2
System.out.println(ss.size());

You had to select 1 option(s)

It will throw an java.lang.UnsupportedOperationException at //1.

It will throw an java.lang.UnsupportedOperationException at //2.

None

Q38. Which of the changes given in options can be done (independent of each other) to let the following code compile and run without errors when its generateReport method is called?

class SomeClass{
String s1 = "green mile"; // 0
public void generateReport( int n ){
String local; // 1
if( n > 0 ) local = "good"; //2
System.out.println( s1+" = " + local ); //3
}
}

You had to select 2 option(s)

Replace String at //0 with var.

Insert after line 2 : if(n <= 0) local = "bad";

Move line 1 and place it after line 0.

change line 1 to : final String local = "rocky";

Insert after line 2 : else local = "bad";

The program already is without any errors.

Q39. Given:

public class Book {
private String title;
private String genre;
public Book(String title, String genre){
this.title = title; this.genre = genre;
}

//accessors not shown
}

and the following code:

List books = Arrays.asList(
new Book("Gone with the wind", "Fiction"),
new Book("Bourne Ultimatum", "Thriller"),
new Book("The Client", "Thriller")
);

List genreList = new ArrayList();
//INSERT CODE HERE
System.out.println(genreList);

Which of the following options will correctly make genreList refer to a List containing the genres of the books present in books List?

You had to select 4 option(s)

Q40. Assume that a method named 'method1' contains code which may raise a non-runtime (checked) Exception.

What is/are the possible way(s) to declare this method so that it indicates that it expects the caller to handle that exception?

You had to select 2 option(s)

public void method1() throws Throwable

public void method1() throw Exception

public void method1() throw new Exception

public void method1() throws Exception

public void method1()

Q41. Given:

public class Student {

public static enum Grade{ A, B , C, D, F}

private String name;
private Grade grade;
public Student(String name, Grade grade){
this.name = name;
this.grade = grade;
}
public String toString(){
return name+":"+grade;
}
//getters and setters not shown
}

What can be inserted in the code below so that it will print:
{C=[S3], A=[S1, S2]}

List ls = Arrays.asList( new Student("S1", Student.Grade.A),
new Student("S2", Student.Grade.A),
new Student("S3", Student.Grade.C));
//INSERT CODE HERE
System.out.println(grouping);

You had to select 1 option(s)

None

Q42. What will the following class print when compiled and run?

class Holder{

int value = 1;

Holder link;

public Holder(int val){ this.value = val; }

public static void main(String[] args){

final var a = new Holder(5);

var b = new Holder(10);

a.link = b;

b.link = setIt(a, b);

System.out.println(a.link.value+" "+b.link.value);

}

public static Holder setIt(final Holder x, final Holder y){

x.link = y.link;

return x;

}

You had to select 1 option(s)

It will not compile because 'a' is final.

It will not compile because method setIt() cannot change x.link.

It will print 5, 10.

It will print 10, 10.

It will throw an exception when run.

None

Q43. Which of the following code snippet will print 10 random double values?

You had to select 3 option(s)

Q44. What will the following code print when compiled and run?

public class Paper {
public String title;
public int id;

public Paper(String title, int id){
this.title = title;
this.id = id;
}

public static void main(String[] args) {
var papers = new Paper[]{
new Paper("T1", 1),
new Paper("T2", 2),
new Paper("T3", 3)
};

System.out.println(papers);
System.out.println(papers[1]);
System.out.println(papers[1].id);
}
}

You had to select 1 option(s)

None

Q45. What will the following code print when compiled and run?

class Base{
void methodA(){
System.out.println("base - MethodA");
}
}

class Sub extends Base{
public void methodA(){
System.out.println("sub - MethodA");
}
public void methodB(){
System.out.println("sub - MethodB");
}
public static void main(String args[]){
Base b=new Sub(); //1
b.methodA(); //2
b.methodB(); //3
}
}

You had to select 1 option(s)

sub - MethodA and sub - MethodB

base - MethodA and sub - MethodB

Compile time error at //1

Compile time error at //2

Compile time error at //3

None

Q46. Given:

String[] p = {"1", "2", "3" };

Which of the following lines of code is/are valid?

You had to select 1 option(s)

None

Q47. What will the following program print when compiled and run?

class Boo implements Serializable {
transient int ti = 10;
static int si = 20;
}

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

Boo boo = new Boo();
boo.si++;
System.out.println(boo.ti+" "+boo.si);
var fos = new FileOutputStream("c:\\temp\\boo.ser");
var os = new ObjectOutputStream(fos);
os.writeObject(boo);
os.close();

var fis = new FileInputStream("c:\\temp\\boo.ser");
var is = new ObjectInputStream(fis);
boo = (Boo) is.readObject();
is.close();
System.out.println(boo.ti+" "+boo.si);
}
}

You had to select 1 option(s)

It will not compile.

It will throw an exception at run time.

10 21
10 21

10 21
10 20

10 21
0 20

10 21
0 21

None

Q48. Consider the following code.

LocalDate d = LocalDate.now();
Locale loc = new Locale("fr", "FR");
// 1 insert code here.

What should be inserted at //1 above so that it will print the date in French format?

You had to select 1 option(s)

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy", loc);
System.out.println(df.format(d));

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
System.out.println(df.format(d, loc));

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
df.setLocale(loc);
System.out.println(df.format(d));

d.setLocale(loc);
DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
System.out.println(df.format(d));

None

Q49. What would be the result of compiling and running the following program?

class SomeClass{
public static void main(String args[]){
var size = 10;
var arr = new int[size];
for (var i = 0 ; i < size ; ++i) System.out.println(arr[i]);
}
}

You had to select 1 option(s)

The code will fail to compile, because the int[] array declaration is incorrect.

The program will compile, but will throw an IndexArrayOutOfBoundsException when run.

The program will compile and run without error, and will print nothing.

The program will compile and run without error and will print null ten times.

The program will compile and run without error and will print 0 ten times.

The code will fail to compile, because the array elements are being accessed without being initialized first.

None

Q50. Consider the following code appearing in the same file:

class Data {
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?

You had to select 2 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 statement:
d = d + 1;

Q51. Your application consists of two jar files produced by two different teams - accounting-3.2.jar and reporting-5.6.jar. Classes in reporting-5.6.jar uses classes from com.abc.accounts package in accounting-3.2.jar while classes in accounting-3.2.jar do not refer to classes from reporting-5.6.jar.

The application is currently launched using the following command:
java -classpath accounting-3.2.jar;reporting-5.6.jar com.abc.reporting.Main

The accounting team has decided to modularize the new version of their jar but the reporting team hasn't.

Which of the following commands can be used to launch the reporting application using the new version of accounting jar?

You had to select 2 option(s)

java -classpath accounting-3.3.jar;reporting-5.6.jar com.abc.reporting.Main

java -classpath reporting-5.6.jar --module-path accounting-3.3.jar; com.abc.reporting.Main

java --module-path accounting-3.3.jar;reporting-5.6.jar com.abc.reporting.Main

java --module-path accounting-3.3.jar;reporting-5.6.jar
--add-modules accounting
--module reporting/com.abc.reporting.Main

(Assume that the module name in accounting-3.3.jar is accounting.)

Q52. Consider the following code snippet:

//INSERT LINE OF CODE HERE
switch( condition ){
case 1 -> System.out.println("1");
case 2 -> System.out.println("2");
case 3 -> System.out.println("3");
}

What type can be inserted in the code above so that the above code compiles and runs as expected ?

You had to select 2 option(s)

int condition;

long condition = 2;

var condition = Integer.valueOf("1");

String condition = "1";

var condition = Short.valueOf(1);

Byte condition = 1;

Q53. Which of the following code fragments will NOT cause a compilation error when put inside the following code?

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

//INSERT CODE HERE

}
}

You had to select 2 option(s)

Q54. Consider the following class...

import java.awt.*;
import java.awt.event.*;
class TestFrame extends Frame
{
String s="Message";
public static void main(String args[])
{
var t = new TestFrame();
var b = new Button("press me");
b.addActionListener(new ActionListener()
{
public void actionPerformed(ActionEvent e)
{
System.out.println("Message is " +s);
}
}
);
t.add(b);
}
}

What will happen when you attempt to compile and run the program?
NOTE: Although this question uses classes from the AWT package, it is not about those class. You may see exam questions referring to classes that are not on the exam objectives. If you see such classes, you can safely assume that the question is not about them.

You had to select 1 option(s)

It will not compile because the variable s is not accessible from the inner class.

It will compile but not show anything when run.

It will compile and show a very small Frame.

It will compile and show a frame big enough to display the button.

It will not compile because of incorrect usage of var.

None

Q55. Which statements, when inserted in the code below, will cause an exception at run time?

class B {}
class B1 extends B {}
class B2 extends B {}
public class ExtendsTest{
public static void main(String args[]){
B b = new B();
B1 b1 = new B1();
B2 b2 = new B2();
// insert statement here
}
}

You had to select 1 option(s)

b = b1;

b2 = b;

b1 = (B1) b;

b2 = (B2) b1;

b1 = (B) b1;

None

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