Java Standard Test 5 – 2025

Free Oracle Java SE 21 exam (1Z0‑830) test 5

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Welcome to your Standard Test 5 - 2025

Name

Phone

Q1. Consider the following module descriptors:

module movies{ //1
exports com.amazing.movies to rentals;//3
}

and

module rentals{
}

Identify correct statements.

Select 1 option(s):

All members in the movies module are accessible only to the members of the rentals module.

Public members of the movies module are accessible only to the rentals module.

All members of the com.amazing.movies package are accessible only to the members of the com.amazing.rentals package.

Only public members of the com.amazing.movies package are accessible only to the members of the rentals module.

Inserting requires movies; in rentals module-info enables the rentals module to access members of the com.amazing.movies package of the movies module.

None

Q2. What will the following code print when compiled and run?

int [] [] array = {{0}, {0, 1}, {0, 1, 2}, {0, 1, 2, 3}, {0, 1, 2, 3, 4}};
var arr1 = array[4];
System.out.println (arr1[4][1]);
System.out.println (array[4][1]);

Select 1 option(s):

1
1

1
4

4
1

It will not compile.

It will throw ArrayIndexOutOfBoundsException at run time.

It will throw IllegalArgumentException at run time.

None

Q3. Given that a class named mywids.Widget is part of a module named mod.wids packaged in mywidgets.jar, which of the following commands can be used to execute this class?

(Assume that the jar file is located in the current directory and the jar file does not have any entry in its manifest.)

Select 1 option(s):

java --module-path mywidgets.jar --module mywids.Widget

java --module-path mywidgets.jar --module mod.wids/mywids.Widget

java --module-path mywidgets.jar --module mod.wids --main-class mywids.Widget

java --module-path mywidgets.jar --module mod.wids mywids.Widget

None

Q4. Given the following code:

sealed interface Cacheable permits Value, Result{
default void clear(){ System.out.println("clearing cache..."); }
}

Which of the following definitions will compile without error?

Select 2 option(s):

interface Value extends Cacheable{ }
non-sealed abstract class Result implements Cacheable{ }

non-sealed interface Value extends Cacheable{ }
non-sealed abstract class Result implements Cacheable{ }

abstract non-sealed interface Value extends Cacheable{ }
sealed abstract class Result implements Cacheable permits IntResult{ }
final class IntResult extends Result{ }

non-sealed interface Value extends Cacheable{ }
non-sealed abstract class Result { }

non-sealed interface Value extends Cacheable{ }
abstract class Result { }
final class IntResult extends Result implements Cacheable{ }

Q5. Given the following code, which method declarations can be inserted at line 1 without any problems?

public class OverloadTest{
public int sum(int i1, int i2) { return i1 + i2; }
// 1
}

Select 3 option(s):

public int sum(int a, int b) { return a + b; }

public int sum(long i1, long i2) { return (int) i1; }

public int sum(int i1, long i2) { return (int) i2; }

public long sum(long i1, int i2) { return i1 + i2; }

public long sum(int i1, int i2) { return i1 + i2; }

Q6. Given:

public class TestClass {
public static void main(String[] args) {
class NoSupportException extends RuntimeException{
NoSupportException(String message){
super(message);
}
NoSupportException(String message, Throwable cause){
super(message, cause);
}
}
List allOperations = List.of("add", "subtract", "multiply");
List supportedOperations = new ArrayList();
try{
try{
for(String s : allOperations){
if(s.length()<4) throw new NoSupportException("Operation not supported "+s);
else supportedOperations.add(s);
}
}catch(NoSupportException nse){
throw new NoSupportException("Unacceptable Operation", nse);
}
}catch(Exception e){
System.out.println("Exception caught : "+e.getMessage());
}
System.out.println(supportedOperations);
}
}

What will be the result?

Select 1 option(s):

Exception caught : Operation not supported add
[]

Exception caught : Unacceptable Operation
[]

Exception caught : Unacceptable Operation
[subtract, multiply]

Exception caught : Operation not supported add
[subtract, multiply]

Exception caught : Operation not supported add : Unacceptable operation
[]

None

Q7. Given:

record Book(String title, LocalDate releaseDate){}

and the following code:

var books = new ArrayList( List.of(
new Book("The Outsider", LocalDate.of(2019, 1, 1)),
new Book("Becoming", LocalDate.of(2018, 1, 1)),
new Book("Uri", LocalDate.of(2017, 1, 1))) );

Predicate p =
b->b.releaseDate()
.isAfter(IsoChronology.INSTANCE.date(2018, 1, 1));

Set newBooks = books.stream()
INSERT CODE HERE

What can be inserted in the code above so that newBooks will be assigned a set of book titles that were released after the date indicated by the predicate p?

Select 2 option(s):

.collect(Collectors.partitioningBy(p))
.get(true).stream().map(Book::title).collect(Collectors.toCollection(TreeSet::new));

.collect(Collectors.partitioningBy(p))
.get(true).stream().map(Book::getTitle).collect(Collectors.toSet());

.collect(Collectors.partitioningBy(p,
Collectors.mapping(Book::title, Collectors.toSet())));

.collect(Collectors.groupingBy(p,
Collectors.mapping(Book::title, Collectors.toSet())));

.collect(Collectors.filtering(p,
Collectors.mapping(Book::title, Collectors.toSet())));

Q8. Given that a file named test1.txt contains the following data:

01234567
and the following code snippet:

char[] buf = new char[5];
try( FileReader fr = new FileReader("c:\\temp\\test1.txt");
FileWriter fw = new FileWriter("c:\\temp\\test2.txt")){

while( fr.read(buf) != -1){
fw.write(buf);
}
}

What will be the contents of test2.txt after the above code is run?

Select 1 option(s):

0123456700

0123401234

01234567

0123456734

0000000000

None

Q9. What will the following code fragment print?

Path p1 = Paths.get("c:\\..\\temp\\test.txt");
System.out.println(p1.normalize().toUri());

Select 1 option(s):

file:///c:/temp/test.txt

file:///c:/../temp/test.txt

file:///c:/test.txt

An exception will be thrown.

None

Q10. Given:

static boolean validateInput(String str){
return INSERT CODE HERE;
}

Which of the following expressions can be inserted in the above code so that the validateInput method will return true if and only if the input string contains non-whitespace data?

Select 1 option(s):

!str.isBlank()

!str.isEmpty()

str.strip() != ""

!str.equalsIgnoreBlanks("")

str.compareTo("") != 0

None

Q11. Given:

public class ThreadSafety{
List sList = new ArrayList();

public Student getStudent(){
var s = sList.remove(0);
return s;
}
...other irrelevant code
}
If two threads, T1 and T2, concurrently execute getStudent() method on the same ThreadSafety instance, which of the following are possible outcomes? (Assume that there are no nulls in the list.)

Select 3 option(s):

T1 gets a Student object and T2 gets IndexOutOfBoundsException.

T1 and T2 get two different instances of Student objects.

T1 gets a Student object and T2 gets null.

T1 gets a Student object and T2 gets a ConcurrentModificationException.

Both the threads get a reference to the same Student object.

Q12. Your application uses one modular jar (a.jar), which, in turn, uses one non-modular jar (b.jar). Which of the following commands will cause jdeps to include the non-modular jar in its analysis?

Select 1 option(s):

jdeps -module-path lib\a.jar; -classpath lib\b.jar

jdeps --module-path lib\a.jar; lib\b.jar

jdeps --class-path lib\a.jar; lib\b.jar

jdeps -cp lib\b.jar lib\a.jar

jdeps -cp lib\b.jar;lib\a.jar

None

Q13. Given:

var books = new ArrayList(List.of(new Book("The Outsider", "Stephen King"),
new Book("Becoming", "Michelle Obama" ), new Book("Uri", "India")));
Stream bkStrm = books.stream(); //1
int count = bkStrm.peek(x->x.getTitle()).count();//2

Assuming that the Book class has appropriate constructor and method, what changes can be made to the above code independent of each other to make it will compile ?

Select 1 option(s):

Change //1 to
Stream< Book > bkStrm = books.stream();//1

Change //2 to :
long count = bkStrm.peek(x->x.getTitle()).count();

Change //2 to :
int count = bkStrm.peek(x->((Book)x).getTitle()).count();

Change //2 to :
int count = bkStrm.peek((Book x)->x.getTitle()).count();

Change //2 to :
long count = bkStrm.peek(x->((Book)x).getTitle()).count();

Change //2 to :
long count = bkStrm.peek((Book x)->x.getTitle()).count();

None

Q14. Given the following line of code:

LocalDateTime dt = LocalDateTime.parse("2022-01-02T17:13:50");

Which of the following lines will return the date string in ISO 8601 format?

Select 2 option(s):

dt.format(java.time.format.DateTimeFormatter.DATE_TIME);

dt.format(java.time.format.DateTimeFormatter.ISO_DATE_TIME);

dt.format(java.time.format.DateTimeFormatter.LOCAL_DATE_TIME);

dt.toString();

Q15.What will the following code print when run?

Period p = Period.between(LocalDate.now(), LocalDate.of(2022, Month.SEPTEMBER, 1));
System.out.println(p);

Duration d = Duration.between(LocalDateTime.now(),
LocalDateTime.of(2022, Month.SEPTEMBER, 2, 10, 10));

System.out.println(d);

Assume that the local time on the system at the time this code is run is 2nd Sep 2022 1:00 AM.

Select 1 option(s):

P-1D
PT9H10M

P1D
PT9H10M

P-1D
P9H10M

P1D
P9H10M

None

Q16. Given:

public class TestClass{

static int someMethod(){ return 100; }

static class MyWorker{
Runnable r;
public MyWorker(Runnable r){
this.r = r;
}
}
public static void main(String[] args) {
//INSERT CODE HERE
MyWorker w = new MyWorker(r);
}
}

What can be inserted in the above code?

Select 3 option(s):

Runnable r = ()->System.out.println("Hello");

Runnable r = { System.out.println("Hello");}

Runnable r = () -> System.out::println();

Runnable r = (a)->System.out.println(a);

Runnable r = -> System.out.println();

Runnable r = ()-> { someMethod(); };

Runnable r = ()-> someMethod();

Q17. Given the following code (assume appropriate imports):

public class IOTest {
public static void main(String[] args) {
var myfile = Paths.get("test.txt");
try(var bfr = Files.newBufferedReader(myfile, Charset.forName("US-ASCII") )){
String line = null;
while( (line = bfr.readLine()) != null){
System.out.println(line);
}
}catch(Exception e){
System.out.println(e);
}
}
}

What will be printed when this code is run if test.txt doesn't exist?

Select 1 option(s):

java.io.FileNotFoundException: test.txt

java.nio.file.FileNotFoundException: test.txt

java.nio.file.NoSuchFileException: test.txt

java.nio.file.InvalidPathException : test.txt

None

Q18. What will be the output if you run the following program?

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

Select 1 option(s):

0 0 will be printed twice.

1 1 will be printed once.

0 1 will be printed followed by 1 2.

0 0 will be printed followed by 1 1.

It will print 0 0 and then 0 1.

None

Q19. Given the following code snippet:

int rate = 10;
int t = 5;
XXX amount = 1000.0;
for(int i=0; i<t; i++){
amount = amount*(1 - rate/100);
}

What can XXX be?

Select 1 option(s):

int

long

only double

double or float

float

None

Q20. Consider the following code appearing in a file named TestClass.java:

class Test{ } // 1

public class TestClass {

var v1; // 2

public int main(String[] args) { // 3

var v2; //4

double x=10, double y; // 5

var v3 = null; //6

for(var k=0; k<x; k++){ } //7

Float params[][] = {1.1f, 1.2f, 3.2f}; //8

return 0;
}
}

Which of the lines are valid?

Select 3 option(s):

// 1

// 2

// 3

// 4

// 5

// 6

// 7

//8

Q21. What will the following code fragment print?

Path p1 = Paths.get("photos\\..\\beaches\\.\\calangute\\a.txt");
Path p2 = p1.normalize();
Path p3 = p1.relativize(p2);
Path p4 = p2.relativize(p1);

System.out.println(
p1.getNameCount()+" "+p2.getNameCount()+" "+
p3.getNameCount()+" "+p4.getNameCount());

Select 1 option(s):

6 4 10 10

7 4 11 10

7 3 8 9

6 3 1 1

None

Q22. Which of the following are valid declarations inside the FooI interface?

interface AI{
void moo();
}
interface FooI extends AI{
//INSERT CODE HERE
}

Select 2 option(s):

private void foo(){ };

private abstract void foo();

static void foo();

protected void foo();

public final void compute();

final void foo(){ }

@Override
void moo();

Q23. Consider the following classes...

class Car{
public int gearRatio = 8;
public String accelerate() { return "Accelerate : Car"; }
}
public class SportsCar extends Car{
public int gearRatio = 9;
public String accelerate() { return "Accelerate : SportsCar"; }
public static void main(String[] args){
Car c = new SportsCar();
System.out.println( c.gearRatio+" "+c.accelerate() );
}
}

What will be printed when SportsCar is run?

Select 1 option(s):

8 Accelerate : Car

9 Accelerate : Car

8 Accelerate : SportsCar

9 Accelerate : SportsCar

None of the above.

None

Q24. Given:

import java.time.LocalDate;
import static java.time.DayOfWeek.*;
public class TestClass {
public static void main(String[] args){
var day = LocalDate.now().with(FRIDAY).getDayOfWeek();

switch(day){
case MONDAY:
TUESDAY:
WEDNESDAY:
THURSDAY:
FRIDAY:
System.out.println("working");
case SATURDAY:
SUNDAY:
System.out.println("off");
}
}
}

What is the output?

Select 1 option(s):

working
off

working

No output will be produced

compilation failure

Exception will be thrown at run time.

None

Q25. Which line(s) in the following code will fail compilation?

interface Tool{ //1
void operate(); //2
}

abstract class PowerTool implements Tool{ } //3

class PowerSaw implements PowerTool{ //4
@Override //5
public void operate(){ }
}

class SteamPowerSaw extends PowerSaw{ //6
@Override //7
public void operate(int pressure){ }
}

Select 2 option(s):

//1

//2

//3

//4

//5

//6

//7

Q26. Your application includes a method that generates a report using Employee data. While generating the report, if this method detects inconsistent payment records, it cannot generate the report. You want to create a new exception class that should be thrown in this situation. Which of the following is the best implementation for this exception?

Select 1 option(s):

public class ReconciliationException extends Throwable{
}

public class ReconciliationError extends Error{
}

public class ReconciliationException extends Exception{
}

public class ReconciliationException {
}

None

Q27.Which of the following code snippets appearing inside a method are valid?

Select 1 option(s):

for(var x : System.getProperties().entrySet()){
var m = x.getKey();
}

for(var x : System.getProperties().keySet()){
System.out.println(x.length());
}

var obj = null;

var k = System.out::println;

var _ = new ArrayList<>();

var _ = 10;

None

Q28. Given:

class MyException extends Exception {
private final int code;
public MyException(int code, Throwable actualEx){
super(actualEx);
this.code = code;
}

public MyException(int code, String message, Throwable actualEx){
super(message, actualEx);//1
this.code = code;
}

public String getMessage(){
return String.format("Exception - Code=%d, Msg=%s, OrigMsg=%s",
code, super.getMessage(), this.getCause().getMessage()); //2
}
}

public class TestClass {
public static void main(String[] args) {
try{
throw new MyException(404, "NOT FOUND",
new IOException("FILE UNREADABLE")); //3
}catch(Exception e){
System.out.println(e.getMessage());
}
}
}

What is the result?

Select 1 option(s):

Compilation failure at //1

Compilation failure at //2

It will print:
Exception - Code=404, Msg=NOT FOUND, OrigMsg=FILE UNREADABLE

It will print:
Exception - Code=404, Msg=, OrigMsg=FILE UNREADABLE

It will print:
Exception - Code=404, Msg=, OrigMsg=

It will print:
Exception - Code=404, Msg=FILE UNREADABLE, OrigMsg=NOT FOUND

None

Q29.Given:

var bfr = new BufferedReader(new FileReader("c:\\temp\\pathtest\\a.java"));
var bfw = new BufferedWriter(new FileWriter("c:\\temp\\pathtest\\b.java"));
String line = null;
while( (line=bfr.readLine()) != null ){
bfw.append(line);
}

//INSERT CODE HERE

bfw.close();

Which of the following lines is required to be inserted in the code above so that content in b.java will be overwritten with the content in a.java?

Select 1 option(s):

bfr.close();

bfw.destroy();

bfr.flush();

bfw.flush();

None of the above.

None

Q30. What will be printed when the following program is compiled and run?

class Super{
public int getNumber( int a){
return 2;
}
}
public class SubClass extends Super{
public int getNumber( int a, char ch){
return 4;
}
public static void main(String[] args){
System.out.println( new SubClass().getNumber(4) );
}
}

What will be printed?

Select 1 option(s):

It will not compile.

It will throw an exception at runtime.

None of the above.

None

Q31. Which is the first line that will cause compilation to fail in the following program?

// Filename: A.java
class A{
public static void main(String args[]){
A a = new A();
B b = new B();
a = b; // 1
b = a; // 2
a = (B) b; // 3
b = (B) a; // 4
}
}
class B extends A { }

Select 1 option(s):

At Line 1.

At Line 2.

At Line 3.

At Line 4.

None of the above.

None

Q32. The following are complete contents of ConsoleTest.java:

import java.io.Console;
public class ConsoleTest {
public static void main(String[] args) {
var c = System.console(); //1
char[] line = c.readPassword("Please enter your pwd:"); //2
System.out.println("Pwd is "+new String(line));
}
}

What will happen when it is compiled and run from the command line?

Select 1 option(s):

It will print whatever password is entered by the user.

It will print a garbled version of whatever password is entered by the user.

It will throw an exception at run time.

It will not compile because it does not incorporate exception handling for the readPassword method.

It will not compile because it does not incorporate exception handling for System.console() method.

None

Q33. Given:

public class Student {
private String name;
private int marks;

//constructor and getters and setters not shown

public void addMarks(int m){
this.marks += m;
}
public void debug(){
System.out.println(name+":"+marks);
}
}

What will the following code print when compiled and run?

List slist = List.of(new Student("S1", 40),
new Student("S2", 35),
new Student("S3", 30));
Consumer increaseMarks = s->s.addMarks(10);
slist.forEach(increaseMarks);
slist.forEach(Student::debug);

Select 1 option(s):

S1:50
S2:45
S3:40

S1:40
S2:35
S3:30

It will not print anything.

It will not compile.

None

Q34. Given:

public static void main(String[] args) {
INSERT CODE HERE
List.of(args).forEach(x);
}

Which of the following options can be inserted in the above code without causing a compilation error?

Select 2 option(s):

Consumer x = ()->{ System.out::println; }

Consumer x = System.out::println;

var x = System.out::println;

Consumer x = (m)->{ };

Consumer x = (String msg)->{ System.out.println(msg); };

Q35. Given:

//creating Book objects using Book(String title, String author) constructor
var books = List.of( new Book("Where the Crawdads Sing", "Dalia Owens" ),
new Book("The Outsider", "Stephen King"),
new Book("Elevation", "Stephen King"),
new Book("Coffin from Hong Kong", "James Hadley Chase") );
Stream bkStrm = books.stream();

*INSERT CODE HERE*

Assuming Book class has appropriate constructor and accessor methods, which of the following lines of code will get you the first book written by Stephen King from the list of of books?

Select 1 option(s):

Optional< Book > bk = bkStrm.findFirst(b->b.getAuthor().equals("Stephen King"));

Book bk = bkStrm.findFirst(b->b.getAuthor().equals("Stephen King"));

Optional< Book > bk = bkStrm.filter(b->b.getAuthor().equals("Stephen King")).findFirst();

Book bk = bkStrm.filter(b->b.getAuthor().equals("Stephen King")).findFirst();

Optional< Book > bk = bkStrm.firstMatch(b->b.getAuthor().equals("Stephen King"));

Optional< Book > bk = bkStrm.anyMatch(b->b.getAuthor().equals("Stephen King"));

Optional< Book > bk = bkStrm.filter(b->b.getAuthor().equals("Stephen King")).findAny();

None

Q36. What can be the return type of method ///getSwitch/// so that this program compiles and runs without any problems?

public class TestClass{
public static XXX getSwitch(int x){
return x - 20/x + x*x;
}
public static void main(String args[]){
switch( getSwitch(10) ){
case 1 :
case 2 :
case 3 :
default : break;
}
}
}

Select 1 option(s):

int

float

long

double

char

byte

short

None

Q37. What will be the result of attempting to compile and run the following code?

public class Nesting
{
public static void main(String args[])
{
B.C obj = new B( ).new C( );
}
}
class A
{
char c;
A(char c) { this.c = c; }
}
class B extends A
{
char c = 'a';
B( ) { super('b'); }
class C extends A
{
char c = 'c';
C( )
{
super('d');
System.out.println(B.this.c);
System.out.println(C.this.c);
System.out.println(super.c);
}
}
}

Select 1 option(s):

It will not compile.

It will throw an exception at run time.

The program will compile without error, and print a, c and d in that order when run.

The program will compile without error, and print a, b and d in that order when run.

The program will compile without error, and print b, c and a in that order when run.

None

Q38. Given that test1.txt exists but test2.txt doesn't exist, consider the following code?

public class FileCopier {

public static void copy1(Path p1, Path p2) throws Exception {
Files.copy(p1, p2, StandardCopyOption.COPY_ATTRIBUTES);
}

public static void main(String[] args) throws Exception {
Path p1 = Paths.get("c:\\temp\\test1.txt");
Path p2 = Paths.get("c:\\temp\\test2.txt");
copy1(p1, p2);
}
}

Which file attributes will be copied over to test2.txt?

Select 1 option(s):

hidden

readonly

Q39. Consider the following code:

public class Student {
private Map marksObtained
= new HashMap();
private ReadWriteLock lock = new ReentrantReadWriteLock();
public void setMarksInSubject(String subject, Integer marks){
// valid code to set marks for a given subject
}
public double getAverageMarks(){

//1 - INSERT CODE HERE

var sum = 0.0;
try{
for(Integer mark : marksObtained.values()){
sum = sum + mark;
}
return sum/marksObtained.size();
}finally{

//2 - INSERT CODE HERE

}
}
}

What should be inserted at //1 and //2?

Select 1 option(s):

lock.lock();
and
lock.unlock();

lock.readLock();
and
lock.readUnlock();

lock.read();
and
lock.unlock();

lock.readLock().lock();
and
lock.readLock().unlock();

None

Q40. Consider the following code snippet ...

boolean[] b1 = new boolean[2];
boolean[] b2 = {true , false};
System.out.println( "" + (b1[0] == b2[0]) + ", "+ (b1[1] == b2[1]) );

What will it print ?

Select 1 option(s):

It will not compile.

It will throw ArrayIndexOutOfBoundsError at Runtime.

false, true

true, false

It will print false, false.

None

Q41. Consider the contents of following two files:

//In file A.java
package a;
public class A{
A(){ }
public void print(){ System.out.println("A"); }
}

//In file B.java
package b;
import a.*;
public class B extends A{
B(){ }
public void print(){ System.out.println("B"); }
public static void main(String[] args){
new B();
}
}

What will be printed when you try to compile and run class B?

Select 1 option(s):

It will print A.

It will print B.

It will not compile.

It will compile but will not run.

None of the above.

None

Q42. Consider the following code fragment:

public static void myMethod(int x) //Specify throws clause here
{
try{
if(x == 0){
throw new ClassNotFoundException();
}
else throw new NoSuchFieldException();
}catch(RuntimeException e){
throw e;
}
}

Which of the following is a valid throws clause for the above method?

Select 2 option(s):

No throws clause is necessary.

throws ClassNotFoundException, NoSuchFieldException

throws ClassNotFoundException

throws NoSuchFieldException

throws Exception

Q43. Given that Book is a valid class with appropriate constructor and getTitle and getPrice methods that return a String and a Double respectively, what can be inserted at //1 and //2 so that it will print the price of all the books having a title that starts with A?

List books = Arrays.asList(
new Book("Atlas Shrugged", 10.0),
new Book("Freedom at Midnight", 5.0),
new Book("Gone with the wind", 5.0)
);

Map bookMap = //1 INSERT CODE HERE
//2 INSERT CODE HERE
bookMap.forEach(func);

Select 1 option(s):

books.stream().collect(Collectors.toMap((b->b.getTitle()), b->b.getPrice()));
and
BiConsumer<String, Double> func = (a, b)->{
if(a.startsWith("A")){
System.out.println(b);
}
};

books.stream().toMap((b->b.getTitle()), b->b.getPrice()));
and
BiConsumer<String, Double> func = (a, b)->{
if(a.startsWith("A")){
System.out.println(b);
}
};

books.stream().toMap((b->b.getTitle()), b->b.getPrice()));
and
BiConsumer<Map.Entry> func = (b)->{
if(b.getKey().startsWith("A")){
System.out.println(b.getValue());
}
};

books.stream().collect(Collectors.toMap((b->b.getTitle()), b->b.getPrice()));
and
Consumer<Map.Entry<String, Double>> func = (e)->{
if(e.getKey().startsWith("A")){
System.out.println(e.getValue());
}
};

None

Q44. Given:

Character[] ca = { 'b', 'c', 'a', 'e', 'd' };
List l = Arrays.asList(ca);
l.parallelStream().peek(System.out::print).forEachOrdered(System.out::print);

Identify the correct statement about the above code.

Select 1 option(s):

The characters printed by peek may be in any order but the characters printed by forEachOrdered will always be in the same order as the original list i.e. bcaed.

The characters printed by forEachOrdered will always be in the same order as the one printed by the peek method.

If forEachOrdered is replaced with forEach, the order of the characters printed by forEach will be the same as the one printed by peek.

Both - peek and forEachOrder - may print the characters in any order.

None

Q45. Which of the following statements are correct regarding the module system of Java.

Select 3 option(s):

Although not recommended, it is possible to customize what packages a module exports from the command line.

An advantage of java modules functionality is that users of a module cannot alter the list of exported packages of that module.

If a module does not export a package, there is no way to export that package to all other modules from the command line.

If a module wants to read another module but only temporarily, it can request such access using command line options.

A module can request access to another module temporarily using command line options but only if the target module already exports that package in its module-info.

Modules allows a sealed class and its direct subtypes to be members of different packages.

Q46. Which of the following are valid implementations of java.lang.Comparable?

Select 1 option(s):

var cin = new Comparable<Integer>(){
public int compareTo(Integer i1, Integer i2){
return i1.compareTo(i2);
}
};

var cin = new Comparable<Integer>(){
public int compareTo(Integer i1){
return "100".compareTo(""+i1);
}
};

var cin = new Comparable<Integer>(){
int i = 10;
public int compare(Integer i1){
return i1-this.i;
}
};

var cin = new Comparable<Integer>(){
public int compareTo(Integer i1, Integer i2){
return i1 - i2;
}
};

None

Q47. Given:

import java.util.*;
public class EventProcessor{
public void processEvents(Collection c){
c.forEach(o -> System.out.println(o));
}
}

class MapEventProcessor extends EventProcessor{
public void processEvents(Map events){
*INSERT CODE HERE*
}
}

Which of the following options can be inserted in the above code without compilation error?

Select 2 option(s):

super.processEvents(events.values());

super.processEvents(events);

events.forEach( (k, v)->processEvents(v));

processEvents(events.values());

processEvents(new List(events.values));

Q48. Given the following set of member declarations, which of the following is true?

int a; // (1)
static int a; // (2)
int f( ) { return a; } // (3)
static int f( ) { return a; } // (4)

Select 2 option(s):

Declarations (1) and (3) cannot occur in the same class definition.

Declarations (2) and (4) cannot occur in the same class definition.

Declarations (1) and (4) cannot occur in the same class definition.

Declarations (2) and (3) cannot occur in the same class definition.

Declarations (1) and (2) cannot occur in the same class definition.

Q49. 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(double... a){
System.out.println("In double "+(a[0]+a[1]) );
}
public static void printSum(float a, float b){
System.out.println("In float "+(a+b));
}
public static void printSum(int a, float b){
System.out.println("In intfloat "+(a+b));
}
public static void main(String[] args) {
printSum(1, 2.0);
}
}

What will be printed?

Select 1 option(s):

In float 3

In float 3.0

In double 3.0

In double 3

In intfloat 3.0

It will not compile.

None

Q50. Which of the following commands can be used to identify class and module dependencies?

Select 1 option(s):

jar -describe

java --describe

jmod describe

jmod --describe

jmod --show-module-resolution

None

Time's up