Java Standard Test 2 – 2025

Free Oracle Java SE 21 (1Z0‑830) practice test 2. It is a respected credential. Yet, recruiters emphasize practical skills: debugging, deploying, and collaborating on projects. Certifications open doors, but real‑world coding experience keeps them open.

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Welcome to your Standard Test 2 - 2025

Name

Email

Phone

Q1. Given the following code:

//in file A.java
package p1;
public sealed class A permits p2.B{
}

//in file B.java
package p2;
public final class B extends p1.A{
}

Identify correct statements.

Select 1 option(s):

The code will compile fine if both A and B are part of the same named module.

Both the classes must belong to the same package for the code to compile irrespective of whether they belong to the same module or not.

Both the classes will compile as long as they are packaged in the same jar.

Class B will compile if, instead of final, it is made non-sealed.

None

Q2. Given:

sealed interface Member permits Person{ //LINE A
String role();
void role(String role);
}

final record Person(String role) implements Member{ //LINE B
public void role(String r){
}
};

record Student(int id, Person person)
{
public String getRole(){ return person.role(); }

public void setRole(String role){ person.role(role); } //LINE C
}

public class TestClass{

public static void m(Student m){
if(m instanceof Student(var id, Person(var role))){ //LINE D
System.out.println("role = "+role);
}
}

public static void main(String[] args) {
Student s = new Student(123, new Person("student")); //LINE E
m(s);
}
}

Which of the marked lines in the above code are invalid?

Select 1 option(s):

LINE A, because an interface cannot be sealed.

LINE B, because Person does not correctly implement the Member interface.

LINE B, because Person is a record and so, it cannot have a method that accepts an argument.

LINE C, because Student is not allowed to have a setter method.

LINE D

LINE E

None of the marked lines are invalid and there is no cause for compilation error in the given code.

None

Q3. Given:

public record Journal(int id, String name){
public Journal{ //1
id = id+1;
}

public Journal(int id, String name){ //2
this.id = id;
}
}

Identify correct statement(s).

Select 1 option(s):

This record class will compile without any error.

It will compile if the second constructor is removed altogether.

It will compile if the first constructor is removed altogether.

It will compile if the second constructor is removed altogether and the line id = id+1; in the first constructor is changed to this.id = id+1; this.name=name;.

None

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

//imports not shown
class Movie{
static enum Genre {DRAMA, THRILLER, HORROR, ACTION };
private Genre genre;
private String name;
private char rating = 'R';
Movie(String name, Genre genre, char rating){
this.name = name; this.genre = genre; this.rating = rating;
}
//accessors not shown
}
public class FilteringStuff {
public static void main(String[] args) {
List movies = Arrays.asList(
new Movie("Titanic", Movie.Genre.DRAMA, 'U'),
new Movie("Psycho", Movie.Genre.THRILLER, 'U'),
new Movie("Oldboy", Movie.Genre.THRILLER, 'R'),
new Movie("Shining", Movie.Genre.HORROR, 'U')
);

movies.stream()
.filter(mov->mov.getRating()=='R')
.peek(mov->System.out.println(mov.getName()))
.map(mov->mov.getName());
}

}

Select 1 option(s):

It will not print anything.

Titanic
Psycho
Oldboy
Oldboy
Shining

Oldboy
Oldboy

Oldboy

It will throw an exception at run time.

None

Q5. You are the maintainer of a library packaged as bondanalytics.jar, which is used by several groups in your company. It has the following two packages that are used by other applications:

com.abc.bonds
com.abc.bonds.analytics

You want to modularize this jar with least impact to others. What will you do?

Select 1 option(s):

Split the jar into two modules - one exporting com.abc.bonds package and another exporting com.abc.bonds.analytics package.

Just add module-info.java to the jar with exports clauses for both the packages.

Just add an empty module-info.java to the jar.

It cannot be modularized without impacting existing non-modular applications that use it.

None

Q6. Given:

class A extends Thread
{
boolean flag = true;
public void run()
{
System.out.println("Starting loop");

while( flag ){ }; //1

System.out.println("Ending loop");
}
}
public class TestClass
{
public static void main(String args[]) throws Exception
{
A a = new A();
a.start();
Thread.sleep(1000);

//2

}
}

Idenfity correct statements about the above program.

Select 1 option(s):

It will run and end cleanly if a.flag = false; is inserted at //2.

It will run and end cleanly if //1 is replaced with while(!isInterrupted()) { }; and a.interrupt(); is inserted at //2.

It will run and will end with an InterruptedException stack trace on the command line if a.interrupt(); is inserted at //2.

It will run and end cleanly if all of the following three changes are made:
1. //1 is replaced with while(!isInterrupted()) { };
2. a.interrupt(); is inserted at //2.
and
3. class A is made to extend VirtualThread instead of Thread.

None

Q7. Given:

public class LoopTest {
int k = 5;
public boolean checkIt(int k){
return k-->0?true:false;
}
public void printThem(){
while(checkIt(k)){
System.out.print(k);
}
}
public static void main(String[] args) {
new LoopTest().printThem();
}
}

What changes should be made so that the program will print 54321?

Select 1 option(s):

No change is necessary.

Replace System.out.print(k); with System.out.print(k--);

Replace System.out.print(k); with System.out.print(--k);

Replace while(checkIt(k)) with while(checkIt(--k)).

Replace return k-->0?true:false; with return this.k-->0?true:false;

None

Q8. What will the following program print?

public class TestClass{
static boolean b;
static int[] ia = new int[1];
static char ch;
static boolean[] ba = new boolean[1];
public static void main(String args[]) throws Exception{
var x = false;
if( b ){
x = ( ch == ia[ch]);
}
else x = ( ba[ch] = b );
System.out.println(x+" "+ba[ch]);
}
}

Select 1 option(s):

true true

true false

false true

false false

It will not compile.

None

Q9. What will the following code print when compiled and run?

Select 1 option(s):

[1]

[3]

[3, 3]

[2]

[1, 2]

None

Q10. Consider the following program...

class ArrayTest{
public static void main(String[] args){
var ia[][] = { {1, 2}, null };
for (int i = 0; i < 2; i++)
for (int j = 0; j < 2; j++)
System.out.println(ia[i][j]);
}
}

Which of the following statements are true?

Select 1 option(s):

It will throw an ArrayIndexOutOfBoundsException at Runtime.

It will throw a NullPointerException at Runtime.

It will compile and run without throwing any exceptions.

It will compile and throw a NullPointerException at runtime if var ia[][] = { {1, 2}, null }; is replaced with var ia = new int[][]{ {1, 2}, null };.

It will compile and throw a NullPointerException at runtime if var ia[][] = { {1, 2}, null }; is replaced with var ia[][] = new int[][]{ {1, 2}, null };.

None

Q11. You are working on an application that is NOT structured as a modular application. However, you need to use a third party library that is packaged as a modular jar named abc.utils.jar in your application.

Given that you launch your application using a class named Main, which of the following options should be used to make sure your application is able to access the classes in the third party jar?

(Assume that abc.utils.jar and your application classes are in current directory.)

Select 1 option(s):

Extract the contents of abc.utils.jar in current directory and launch Main like this:
java Main

java -classpath . -module abc.utils.jar Main

java --module-path abc.utils.jar Main

java -classpath .;abc.utils.jar Main

None

Q12. Identify correct statements above the following code:

var myES = Executors.newSingleThreadExecutor();
myES.submit(() -> {}); //1
myES.submit(() -> 100);//2

Select 2 option(s):

//1 will not compile.

//2 will not compile.

The lambda expression used at //1 implements java.util.concurrent.Callable.

The lambda expression used at //1 implements java.lang.Runnable.

The lambda expression used at //2 implements java.util.concurrent.Callable.

The lambda expression used at //2 implements java.lang.Runnable.

The code will compile but will throw an exception at runtime.

Q13. Assuming that the following method will always be called with a phone number in the format ddd-ddd-dddd (where d stands for a digit), what can be inserted at //1 so that it will return a String containing the same number except its last four digits will be masked with xxxx?

public static String hidePhone(String fullPhoneNumber){
//1 Insert code here
}

Select 3 option(s):

return new StringBuilder(fullPhoneNumber).substring(0, 8)+"xxxx";

return new StringBuilder(fullPhoneNumber).replace(8, 12, "xxxx").toString();

return new StringBuilder(fullPhoneNumber).append("xxxx", 8, 12).toString();

return new StringBuilder("xxxx").append(fullPhoneNumber, 0, 8).toString();

return new StringBuilder("xxxx").insert(0, fullPhoneNumber, 0, 8).toString();

Q14. Consider the following code:

class Super { static String ID = "QBANK"; }

class Sub extends Super{
static { System.out.print("In Sub"); }
}
public class Test{
public static void main(String[] args){
System.out.println(Sub.ID);
}
}

What will be the output when class Test is run?

Select 1 option(s):

It will print In Sub and QBANK.

It will print QBANK.

Depends on the implementation of JVM.

It will not even compile.

None of the above.

None

Q15. What will be the output when the following program is run?

package exceptions;
public class TestClass{
public static void main(String[] args) {
try{
hello();
}
catch(MyException me){
System.out.println(me);
}
}

static void hello() throws MyException{
int[] dear = new int[7];
dear[0] = 747;
foo();
}

static void foo() throws MyException{
throw new MyException("Exception from foo");
}
}

class MyException extends Exception {
public MyException(String msg){
super(msg);
}
}

(Assume that line numbers printed in the messages given below are correct.)

Select 1 option(s):

Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 10
at exceptions.TestClass.doTest(TestClass.java:24)
at exceptions.TestClass.main(TestClass.java:14)

Error in thread "main" java.lang.ArrayIndexOutOfBoundsException

exceptions.MyException: Exception from foo

exceptions.MyException: Exception from foo
at exceptions.TestClass.foo(TestClass.java:29)
at exceptions.TestClass.hello(TestClass.java:25)
at exceptions.TestClass.main(TestClass.java:14)

None

Q16. Consider the following method code:

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

byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
}
catch ( *INSERT CODE HERE* e ) { //LINE 100
}

}

What can be inserted at //LINE 100 to make the method compile?

Select 1 option(s):

Exception|IOException

FileNotFoundException|SecurityException|IllegalArgumentException

FileNotFoundException|IOException

IOException|RuntimeException

IOException|NoSuchFileException

None

Q17. Given:

public class TestClass
{
public static void main(String args[])
{
B b = new C();
A a = b;
if (a instanceof B b1) b1.b();
if (a instanceof C c1) c1.c();
if (a instanceof D d1) d1.d();
}
}
class A {
void a(){ System.out.println("a"); }
}
class B extends A {
void b(){ System.out.println("b"); }
}
class C extends B {
void c(){ System.out.println("c"); }
}
class D extends C {
void d(){ System.out.println("d"); }
}

What is the result?

Select 1 option(s):

Compilation failure.

ClassCastException thrown at run time.

a
b

b
c

b
c
d

None

Q18. What will the following program print?

public class TestClass{
static String str = """
Hello World""";
public static void changeIt(String s){
s = "Good bye world";
}
public static void main(String[] args){
changeIt(str);
System.out.println(str);
}
}

Select 1 option(s):

Hello World

Good bye world

It will not compile.

It will throw an exception at runtime.

None of the above.

None

Q19. Given:

class Person{
private String name;
private int age;
public Person(String name, int age){
this.name = name;
this.age = age;
}
//getters/setters not shown
}

What will the following code print?

List friends = Arrays.asList(new Person("Bob", 31),
new Person("Paul", 32),
new Person("John", 33));
double averageAge = friends.stream().filter(f->f.getAge()<30)
.mapToInt(f->f.getAge())
.average().getAsDouble();
System.out.println(averageAge);

Select 1 option(s):

It will not compile.

It will throw an exception at runtime.

0.0

32.0

0

32

None

Q20. Given:

public class Book {
private String title;
private String genre;
public Book(String title, String genre){
this.title = title; this.genre = genre;
}
//accessors and toString code not shown
}

and the following code:

var books = new ArrayList(List.of(new Book("The Outsider", "fiction"),
new Book("Becoming", "non-fiction"),new Book("Uri", "non-fiction")));

books.sort(Comparator.comparing(Book::getGenre)
.thenComparing(Book::getTitle).reversed());
System.out.println(books);

What will be the result?

Select 1 option(s):

[non-fiction:Uri, non-fiction:Becoming, fiction:The Outsider]

[non-fiction:Becoming, non-fiction:Uri, fiction:The Outsider]

[fiction:The Outsider, non-fiction:Becoming, non-fiction:Uri]

[fiction:The Outsider, non-fiction:Uri, non-fiction:Becoming ]

[non-fiction:Becoming, fiction:The Outsider, non-fiction:Uri]

The code will fail to compile.

None

Q21. Consider the following code:

import java.util.List;
import java.util.concurrent.CopyOnWriteArrayList;
public class MyCache {
private CopyOnWriteArrayList cal = new CopyOnWriteArrayList();

public void addData(List list){
cal.addAll(list);
}

public Iterator getIterator(){
return cal.iterator();
}
}


Given that one thread calls the addData method on an instance of the above class and another thread calls the getIterator method on the same instance at the same time and starts iterating through its values, which of the following options are correct?

(Assume that no other calls have been made on the MyCache instance.)

Select 1 option(s):

The call to addAll may be blocked while the other thread is iterating through the iterator.

Both the threads will complete their operations successfully without getting any exception.

The thread iterating through the Iterator will get a ConcurrentModificationException.

Elements added by the addAll method will automatically be visible through the iterator in the other thread.

None

Q22. Consider the following method:

static int mx(int s){
for(int i=0; i<3; i++){
s = s + i;
}
return s;
}

and the following code snippet:

int s = 5;
s += s + mx(s) + ++s;
System.out.println(s);

What will it print?

Select 1 option(s):

21

22

23

24

25

26

None

Q23. What will the following code print when compiled and run?

Stream values = IntStream.rangeClosed(10, 15).boxed(); //1
Object obj = values.collect(Collectors.partitioningBy(x->x%2==0)); //2
System.out.println(obj);

Select 1 option(s):

Compilation error at //1

Compilation error at //2

{[11, 13, 15], [10, 12, 14]}

[[11, 13, 15], [10, 12, 14]]

{false=[11, 13, 15], true=[10, 12, 14]}

None

Q24. Given:

//creating Book objects using Book(String title, String author) constructor
var books = List.of(new Book("The Outsider", "Stephen King"),
new Book("The Shining", "Stephen King" ), new Book("Uri", "India"));
Stream bkStrm = books.stream();//

long count = *INSERT CODE HERE*;
System.out.println(count);


Assuming Book class has appropriate constructor and accessor methods, which of the following statements will correctly print the number of unique authors in the list of Books?

Select 1 option(s):

bkStrm.map(Book::getAuthor).collect(Collectors.toSet()).count()

bkStrm.map(b->b.getAuthor()).distinct().count()

bkStrm.filter(b->b.getAuthor()).count()

bkStrm.map(b->b.getAuthor()).count()

None

Q25. 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 list = new ArrayList();
list.add("val1"); //1
list.add(2, "val2"); //2
list.add(1, "val3"); //3
System.out.println(list);
}
}

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

Q26. Given:

class TestClass{
static class Node{
Node next;
public Node(){
next = null;
}
public Node(Node next){
this.next = next;
}
public String dump(){
return "from dump";
}
}
public static void main(String[] args) {
Node n1 = new Node();
Node n2 = new Node(n1);
Node n3 = new Node();
n1 = null;
System.out.println(n2.dump());
}
}

How many instances of the Node class are eligible for garbage collection while the program prints from dump?

Select 1 option(s):

0

1

2

3

None

Q27. Given:

abstract class Base{
abstract int power();
}

class A extends Base{
@Override
int power(){ return 0; }
}

public class TestClass
{

static void processBase(Base base){
A a = null;
if(base instanceof A a ){
System.out.println(a.power());
}
System.out.println("a is "+a);
}

public static void main(String args[])
{
processBase(new A());
}
}

What is the result?

Select 1 option(s):

0
a is A@5acf9800

0
a is null

0
< stack trace for NullPointerException >

< stack trace for NullPointerException >

a is null

Compilation failure.

None

Q28. Consider the following code:

public class TestClass {

public static void doStuff() throws Exception{
System.out.println("Doing stuff...");
if(Math.random()>0.4){
throw new Exception("Too high!");
}
System.out.println("Done stuff.");
}

public static void main(String[] args) throws Exception {
doStuff();
System.out.println("Over");
}
}

Which of the following are possible outputs when the above program is compiled and run?

(Assume that Math.random() returns a double between 0.0 and 1.0 not including 1.0.
Further assume that there is no mistake in the line numbers printed in the output shown in the options.)

Select 2 option(s):

Doing stuff...
Exception in thread "main" java.lang.Exception: Too high!
at TestClass.doStuff(TestClass.java:29)
at TestClass.main(TestClass.java:41)

Doing stuff...
Exception in thread "main" java.lang.Exception: Too high!
at TestClass.doStuff(TestClass.java:29)
at TestClass.main(TestClass.java:41)
Over

Doing stuff...
Done stuff.
Over

 

Doing stuff...

Exception in thread "main" java.lang.Exception: Too high!

at TestClass.doStuff(TestClass.java:29)

at TestClass.main(TestClass.java:41)

Done stuff.

Q29. What will the following code print when run?

Deque d = new ArrayDeque();
d.push(1);
d.push(2);
d.push(3);
System.out.println(d.pollFirst());
System.out.println(d.poll());
System.out.println(d.pollLast());

Select 1 option(s):

1
2
3

3
2
1

Compilation error

Exception at run time

None

Q30. Consider the following classes :

class A{
public void mA(){ };
}

class B extends A {
public void mA(){ }
public void mB() { }
}

class C extends B {
public void mC(){ }
}
and the following declarations:
A x = new B(); B y = new B(); B z = new C();
Which of the following calls are virtual calls?

Select 3 option(s):

x.mA();

x.mB();

y.mA();

z.mC();

z.mB();

Q31. A java programer has written the following code:

public class Book {
private int id;
private String title;
private String genre;
private String author;

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

//accessors for instance fields not shown here

public static class BookFilter {
public boolean isFiction(Book b){
return b.getGenre().equals("fiction");
}

}
}

He wants to make use of the above code in another class as follows -

List books = Arrays.asList(new Book("30 Days", "fiction", "K Larsen"),
new Book("Fast Food Nation", "non-fiction", "Eric Schlosser"),
new Book("Wired", "fiction", "D Richards"));

books.stream()

.filter(new Book.BookFilter()) //LINE 10

.forEach((Book b) -> System.out.print(b.getTitle()+", "));

What changes mentioned below can he make independent of each other so that the above code will print 30 Days, Wired, ?

Select 2 option(s):

Replace LINE 10 with:
.filter((Book b)->Book.BookFilter::isFiction(b))

Replace LINE 10 with:
.filter((Book b)->new Book.BookFilter(b))

Make the isFiction method in BookFilter class static and replace LINE 10 with:
.filter((Book b)->Book.BookFilter.isFiction(b))

Make the isFiction method in BookFilter class static and replace LINE 10 with:
.filter(Book.BookFilter::isFiction)

Add implements Predicate<Book> to BookFilter declaration.

Q32. Given:

class Square {
private double side = 0;
String color;
public Square(double length){
this.side = length;
}
public double getSide() { return side; }

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

}

public class TestClass {
public static void main(String[] args) throws Exception {
Square mysq = new Square(10);
mysq.color = "red";

//set mysq's side to 20
}
}

Which of the following statements will set the side of Square object referred by mysq to 20?

Select 1 option(s):

mysq.side = 20;

mysq = new Square(20);

mysq.setSide(20);

side = 20;

Square.mysq.side = 20;

None

Q33. Identify correct statements about the module system of Java.

Select 3 option(s):

Every module must reside in a directory (or a jar) of its own.

A module can specify packages as well as services.

Modular JDK is helpful in improving performance of an application.

Modules allow service implementations to be hooked up with service users through dependency injection.

A module can export sealed classes to other modules for extension.

Modules allow a JImage to be produced to run on multiple platforms.

Q34. Identify correct statements.

Select 2 option(s):

String String = """
Str
Str""";
The length of the string pointed to by String will be 8.

String string = """Str Str""";
The length of the string pointed to by string will be 7.

String str = """
Str Str""";
System.out.println(str.charAt(4));

This will print S.

String String =
"""
Str
Str
""";
System.out.println(String.charAt(4));

This will print S.

String String = """
Str
Str""";
This will not compile.

Q35. 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 = //code to create the list goes here

Comparator c1 = (b1, b2)->b1.getGenre().compareTo(b2.getGenre()); //1
books.stream().sorted(c1.thenComparing(Book::getTitle)); //2
System.out.println(books);

Identify the correct statements.

Select 1 option(s):

It will print the list that is sorted by genre and then sorted by title within.

It will print the list that is sorted by title and then sorted by genre within.

It will print the list as it is.

Code will fail to compile because of code at //1.

Code will fail to compile because of code at //2.

None

Q36. Which of the following class definitions is/are legal definition(s) of a class that cannot be instantiated?

class Automobile{
abstract void honk(); //(1)
}

abstract class Automobile{
void honk(); //(2)
}

abstract class Automobile{
void honk(){}; //(3)
}

abstract class Automobile{
abstract void honk(){} //(4)
}

abstract class Automobile{
abstract void honk(); //(5)
}

Select 2 option(s):

1

2

3

4

5

Q37. Given:

var nums = List.of(1, 2, 3, 4, 5, 6, 7).stream();

Predicate p = //a predicate goes here

Optional value = nums.filter(p).reduce((a, b)->a+b);
value.ifPresent(System.out::println);

Select 2 option(s):

setting p to a->a<0; will produce no output.

setting p to a->a<0; will generate a NullPointerException.

setting p to a->a<0; will generate a NoSuchElementException.

setting p to a->a%2==0; will produce 12.

setting p to a->a%2==0; will produce 16.

Q38. Which of the following code snippets will compile without any errors?

(Assume that the statement int x = 0; exists prior to the statements below.)

Select 3 option(s):

while (false) { x=3; }

if (false) { x=3; }

do{ x = 3; } while(false);

for( var i = 0; i< 0; i++) x = 3;

Q39. Consider the following code:

class Bond
{
String ticker; double coupon; java.time.LocalDate maturity;
}

class Portfolio implements Serializable
{
String accountName;
Bond[] bonds;
}

public class TestClass {
public static void main(String[] args) throws Exception{
Portfolio portfolio = // get portfolio somehow
// serialize portfolio
}
}

Which of the following approaches can be taken independent of each other so that a Portfolio object can be serialized while preserving the state of the Bond objects contained in Portfolio?

Select 2 option(s):

It can be serialized as it is without any modification.

Just have Bond class implement Serializable.

Just make 'bonds' field in Portfolio transient.

Change the type of bonds from Bond[] to ArrayList bonds;

Make bonds array transient in Portfolio and implement readObject(ObjectInputStream os) and writeObject(ObjectOutputStream os) methods to read and write the state of Bond objects explicitly.

Q40. Which of the following lines will cause the compilation to fail??

(Assume that all of the following code is in one file.)


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

public class TestClass //2
{
public enum EnumB{ B, BB, BBB }; //3
public static enum EnumC{ C, CC, CCC }; //4
public TestClass()
{
enum EnumD{ D, DD, DDD } //5
}

public void methodX()
{
public enum EnumE{ E, EE, EEE } //6
}

public static void main(String[] args) //7
{
enum EnumF{ F, FF, FFF}; //8
}
}

Select 2 option(s):

1, 2, or both depending on the file name.

3

4

5

6

8

Q41. How can you fix the following code to make it compile:

import java.io.*;
class Great {
public void doStuff() throws FileNotFoundException{
}
}

class Amazing extends Great {
public void doStuff() throws IOException, IllegalArgumentException{
}
}

public class TestClass {
public static void main(String[] args) throws IOException{
Great g = new Amazing();
g.doStuff();
}
}

Assume that changes suggested in a option are to be applied independently of changes suggested in other options.

Select 2 option(s):

Change doStuff in Amazing to throw only IllegalArgumentException.

Change doStuff in Great to throw FileNotFoundException and IllegalArgumentException.

Change doStuff in Amazing to throw only IOException.

Change doStuff in Great to throw only IOException instead of FileNotFoundException.

Replace g.doStuff() to ((Amazing) g).doStuff().

Q42. Consider the following code:

class LowBalanceException extends _______ { //1
public LowBalanceException(String msg){ super(msg); }
}

class WithdrawalException extends _______ { //2
public WithdrawalException(String msg){ super(msg); }
}
class Account{
double balance;
public void withdraw(double amount) throws WithdrawalException{
try{
throw new RuntimeException("Not Implemented");
}catch(Exception e){
throw new LowBalanceException(e.getMessage());
}
}
public static void main(String[] args) {
try{
Account a = new Account();
a.withdraw(100.0);
}catch(Exception e){
System.out.println(e.getMessage());
}
}
}

What can be inserted at //1 and //2 so that the above code will prints Not Implemented?.

Select 1 option(s):

Exception
Exception

Exception
LowBalanceException

WithdrawalException
Exception

Exception
RuntimeException

None

Q43. Given the following code, which of these statements are true?

class TestClass{
public static void main(String args[]){
int k = 0;
int m = 0;
for ( var i = 0; i <= 3; i++){
k++;
if ( i == 2){
// line 1
}
m++;
}
System.out.println( k + ", " + m );
}
}

Select 3 option(s):

It will print 3, 2 when line 1 is replaced by break;

It will print 3, 2 when line 1 is replaced by continue.

It will print 4, 3 when line 1 is replaced by continue.

It will print 4, 4 when line 1 is replaced by i = m++;

It will print 3, 3 when line 1 is replaced by i = 4;

Q44. Consider the following code:

package jqplus;
import java.util.*;

public class Testclass {

public static void main(String[] args) {

NavigableMap mymap = new TreeMap();
mymap.put("a", "apple"); mymap.put("b", "boy"); mymap.put("c", "cat");
mymap.put("aa", "apple1"); mymap.put("bb", "boy1"); mymap.put("cc", "cat1");

mymap.pollLastEntry(); //LINE 1
mymap.pollFirstEntry(); //LINE 2

NavigableMap tailmap = mymap.tailMap("bb", false); //LINE 3

System.out.println(tailmap.pollFirstEntry()); //LINE 4
System.out.println(mymap.size()); //LINE 5

}
}

What will be returned by the call to tailmap.pollFirstEntry() at //LINE 4 and mymap.size() at //LINE 5?

Select 1 option(s):

A ConcurrentModificationException will be thrown at //LINE 1

It will return c - cat and 3

It will return c - cat and 4

It will return bb - boy1 and 4

It will return null and 4

None

Q45. 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:C], A=[S1:A, S2:A]}


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);

Select 1 option(s):

Map< Student.Grade, List< Student > > grouping = ls.stream().groupBy(
Collectors.groupingBy(s ->s.getGrade()));

Map< Student.Grade, List< Student > > grouping = ls.stream().collect(
Collectors.groupingBy(s ->s.getGrade()));

Map< Integer, List< Student > > grouping = ls.stream().groupBy(
Collectors.mapping(
Student::getGrade,
new ArrayList())
);

Map< Integer, List< Student > > grouping = ls.stream().map(
Collectors.groupingBy(s ->s.getGrade()));

None

Q46. Given the following class code:

public class Transfer implements Runnable{
Account from, to;
double amount;
public Transfer(Account from, Account to, double amount){
this.from = from; this.to = to; this.amount = amount;
}
public void run(){
synchronized(from){
from.setBalance(from.getBalance()-amount);
synchronized(to){
to.setBalance(to.getBalance()+amount);
}
}
}
}

Relevant code for the Account class referred above is as follows:
public class Account{
private String id; private double balance;
//constructor and accessor methods not shown,
}


What will happen when the following code is executed?


var es = Executors.newCachedThreadPool();
var a1 = new Account("A1", 1000);
var a2 = new Account("A1", 1000);
es.submit(new Transfer(a1, a2, 200));
es.submit(new Transfer(a2, a1, 300));

Select 1 option(s):

Code will run successfully without any problem.

The code may enter a deadlock.

The code may enter a livelock.

The code may enter a starvation situation.

None

Q47. What will be the result of attempting to compile and run the following program?

class TestClass{
public static void main(String args[]){
int i = 0;
loop : // 1
{
System.out.println("Loop Lable line");
try{
for ( ; true ; i++ ){
if( i >5) break loop; // 2
}
}
catch(Exception e){
System.out.println("Exception in loop.");
}
finally{
System.out.println("In Finally"); // 3
}
}
}
}

Select 1 option(s):

Compilation error at line 1 as this is an invalid syntax for defining a label.

Compilation error at line 2 as 'loop' is not visible here.

No compilation error and line 3 will be executed.

No compilation error and line 3 will NOT be executed.

Only the line with the label loop will be printed.

None

Q48. What will the following code snippet print when compiled and run?

byte starting = 3;
short firstValue = 5;
int secondValue = 7;
int functionValue = (int) (starting/2 + firstValue/2 + (int) firstValue/3 )
+ secondValue/2;
System.out.println(functionValue);

Select 1 option(s):

7

8

10

11

12

It will not compile.

None

Q49. Given:

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

What can be inserted in the code below so that it will print:
{20=[S1:20, S3:20], 30=[S3:30]}


List ls = Arrays.asList(new Student("S1", 20),
new Student("S3", 30), new Student("S3", 20) );

//INSERT CODE HERE
System.out.println(grouping);

Select 1 option(s):

Map< Integer, List< Student > > grouping = ls.stream().collect(
Collectors.groupingBy(
Student::getMarks,
Collectors.mapping(Student::getName, Collectors.toList()))
);

Map< Integer, List< Student > > grouping = ls.stream().collect(
Collectors.groupingBy(
Student::getMarks,
Student)
);

Map< Integer, List< Student > > grouping = ls.stream().collect(
Collectors.groupingBy(
Student::getMarks,
new ArrayList())
);

Map< Integer, List< Student > > grouping =
ls.stream().collect(Collectors.groupingBy(s ->s.getMarks()));

None

Q50. Given the follow two module definitions:

module author{
requires serviceapi;
uses api.BloggerService;
}

and

module abc.blogger{
requires serviceapi;
provides api.BloggerService with abc.SimpleBlogger;
}

Identify correct statement(s).

Select 2 option(s):

api.BloggerService should be defined in author module.

api.BloggerService should be defined in abc.blogger module.

api.BloggerService should be defined in serviceapi module.

abc.blogger module should be on --module-path while executing the author module but is not required while compiling.

author module should be on --module-path while executing the abc.blogger module but is not required while compiling.

Time's up