Java Standard Test 1 – 2025

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Welcome to your Standard Test 1 - 2025

Name

Phone

Q1. Which of the following is/are valid record definition(s)?

Select 3 option(s):

record Student(int id, String... subjects){
@Override
public int id(){
return 10;
}

@Override
public boolean equals(Object obj){
return false;
}
}

record Student(int id, String... subjects){
public void reset(){
id = 0;
subjects = null;
}
}

record Student(int id, String... subjects){
private String address;
public void setAddress(String address){
this.address = address;
}
}

record Student(int id, String... subjects) implements java.io.Serializable{
public static final long serialVersionUID = 0L;
}

interface Person{
int id();
String name();
}
record Student(int id, String... subjects) implements Person{
public String name(){ return "none"; }
}

abstract record Student(int id, String... subjects) {
}

sealed record Student(int id, String... subjects) {
}

Q2. Which of these expressions will obtain the substring "456" from a string defined by

String str = """
0123\
4567"""?

Select 1 option(s):

str.substring(4, 7)

str.substring(4)

str.substring(5, 7)

str.substring(5, 8)

str.substring(4, 3)

None

Q3. Java's Exception mechanism helps in which of the following ways?

Select 2 option(s):

It allows creation of new exceptions that are custom to a particular application domain.

It improves code because error handling code is clearly separated from the main program logic.

It enhances the security of the application by reporting errors in the logs.

It improves the code because the exception is handled right at the place where it occured.

It provides a vast set of standard exceptions that covers all possible exceptions.

Q4. Given :

//In Data.java
public class Data{
int value;
Data(int value){
this.value = value;
}
}

and the following code fragments:
public void printUsefulData(ArrayList dataList, Predicate p){
for(Data d: dataList){
if(p.test(d)) System.out.println(d.value);
}
}

....
ArrayList al = new ArrayList();
al.add(new Data(1));al.add(new Data(2));al.add(new Data(3));

//INSERT METHOD CALL HERE

Which of the following options can be inserted above so that it will print 3?

Select 2 option(s):

printUsefulData(al, (Data d)-> { return d.value>2; } );

printUsefulData(al, d-> d.value>2 );

printUsefulData(al, (d)-> return d.value>2; );

printUsefulData(al, Data d-> d.value>2 );

printUsefulData(al, d -> d.value>2; );

Q5. Given:

import java.util.*;
class Data{
int value;
public Data(int x){ this.value = x; }
public String toString(){ return ""+value; }
}

class MyFilter {
public boolean test(Data d){
return d.value == 0;
}
}

public class TestClass{

public static void filterData(ArrayList dataList, MyFilter f){
Iterator i = dataList.iterator();
while(i.hasNext()){
if(f.test(i.next())){
i.remove();
}
}
}

public static void main(String[] args) {
ArrayList al = new ArrayList();
Data d = new Data(1); al.add(d);
d = new Data(2); al.add(d);
d = new Data(0); al.add(d);

filterData(al, new MyFilter()); //1

System.out.println(al);
}
}

How can you use a lambda expression to achieve the same result?

Select 1 option(s):

Replace the line at //1 with:
filterData(al, x -> x.value==0);

Add implements java.util.function.Predicate to MyFilter definition and replace the line at //1 with:
filterData(al, x -> x.value==0);

Add implements java.util.function.Predicate<Data> to MyFilter definition and replace the line at //1 with:
filterData(al, x -> x.value==0);

Remove MyFilter class altogether.
Change type of f from MyFilter to java.util.function.Predicate in filterData method and replace the line at //1 with:
filterData(al, x -> x.value==0);

Remove MyFilter class altogether.
Change type of f from MyFilter to java.util.function.Predicate<Data> in filterData method and replace the line at //1 with:
filterData(al, x -> x.value==0);

None

Q6. Given the following classes, what will be the output of compiling and running the class Truck?

class Automobile{
public void drive() { System.out.println("Automobile: drive"); }
}

public class Truck extends Automobile{
public void drive() { System.out.println("Truck: drive"); }
public static void main (String args [ ]){
Automobile a = new Automobile();
Truck t = new Truck();
a.drive(); //1
t.drive(); //2
a = t; //3
a.drive(); //4
}
}

//End of Code

Select 1 option(s):

Compiler error at line 3.

Runtime error at line 3.

It will print:
Automobile: drive
Truck: drive
Automobile: drive
in that order.

It will print:
Automobile: drive
Truck: drive
Truck: drive
in that order.

It will print:
Automobile: drive
Automobile: drive
Automobile: drive
in that order.

None

Q7. Given:

public static void main(String[] args) {
Device d1 = new Device(1);
try(d1){
//do some thing with d1
}
}

Identify correct statement(s).

Select 1 option(s):

Device should extend AutoCloseable and override close() method.

Device should implement Closeable and override close() method.

Device should implement Closeable and override autoClose() method.

Device should implement AutoCloseable and override autoClose() method.

Device should implement AutoCloseable and override close() method.

Device should extend AutoCloseable and override autoClose() method.

None

Q8. What will the following code print when compiled and run?

public class DaysTest{

static String[] days = {"monday", "tuesday", "wednesday", "thursday",
"friday", "saturday", "sunday" };

public static void main(String[] args) {

var index = 0;
for(var day : days){

if(index == 3){
break;
}else {
continue;
}
index++;
if(days[index].length()>3){
days[index] = day.substring(0,3);
}
}
System.out.println(days[index]);
}
}

Select 1 option(s):

mon

thu

fri

It will not compile.

It will throw an exception at run time.

None

Q9. What will the following code print when run?

String[] sa = { "charlie", "bob", "andy", "dave" };
var ls = new ArrayList(Arrays.asList(sa));
ls.sort((var a, var b) -> a.compareTo(b));
System.out.println(sa[0]+" "+ls.get(0));

Select 1 option(s):

charlie andy

andy charlie

charlie charlie

andy andy

It will throw an exception at run time.

It will not compile.

None

Q10. What will be the result of attempting to compile and run the following program?

public class TestClass{
public static void main(String args[ ] ){
A o1 = new C( );
B o2 = (B) o1;
System.out.println(o1.m1( ) );
System.out.println(o2.i );
}
}
class A { int i = 10; int m1( ) { return i; } }
class B extends A { int i = 20; int m1() { return i; } }
class C extends B { int i = 30; int m1() { return i; } }

Select 1 option(s):

The program will fail to compile.

Class cast exception at runtime.

It will print 30, 20.

It will print 30, 30.

It will print 20, 20.

None

Q11. You want to change the default locale for formatting numbers, currency, and percentages. Which of the following statements will achieve that?

Select 2 option(s):

Locale.setDefault(Locale.EN_US);

Locale.setDefault("en_US");

Locale.setDefault("en", "US");

Locale.setDefault(Locale.Category.FORMAT, Locale.US);

Locale.setDefault(Locale.Category.FORMAT, "en_US");

Locale.setDefault(Locale.US);

Q12. Given:

public class TestClass
{
public static void main(String[] args) {
String s = "https://3ca51ebc.delivery.rocketcdn.me/usr/home1/test.txt";
String d = "https://3ca51ebc.delivery.rocketcdn.me/usr/home2/test.txt";
//INSERT CODE HERE

}catch(Exception e){ }
}
}

Which of the following code fragments can be inserted in the above code so that the file test.txt can be moved to the destination location even if a file by the same name already esists at the destination location?

Select 1 option(s):

try{
Files.move(Paths.get(s), Paths.get(d), StandardCopyOption.CREATE_NEW);
Files.delete(Paths.get(s));

try{
Files.move(Paths.get(s), Paths.get(d), StandardCopyOption.REPLACE_EXISTING);

try(FileChannel in = new FileInputStream(s).getChannel();
FileChannel out = new FileOutputStream(d).getChannel()){
in.transferTo(0, in.size(), out);
}catch(Exception e){
}

try{
Files.move(Paths.get(s), Paths.get(d));

None

Q13. What will be the output of the following code:

Stream ss = Stream.of("Pizza", "Bread", "Tofu", "Pizza", "Tofu", "Cheese", "Pizza");
Map data = ss.collect( Collectors.groupingBy(Function.identity(),
Collectors.counting()));
data.keySet().stream().sorted().parallel().forEachOrdered(key -> System.out.print(data.get(key)));

Select 1 option(s):

1132

1132 but the order is not guaranteed.

7777

123

123 but the order is not guaranteed.

None

Q14. Given that your code is being run in a locale where the language code is fr and country code is CA, which of the following file names represents a valid resource bundle file name?

Select 1 option(s):

MyResource_fr_CA.xml

MyResource_fr_CA.properties

MyResource_fr_CA.java

MyResource_fr_CA.profile

None

Q15. Considering the following program, which of the options are true?

public class FinallyTest{
public static void main(String args[]){
try{
if (args.length == 0) return;
else throw new Exception("Some Exception");
}
catch(Exception e){
System.out.println("Exception in Main");
}
finally{
System.out.println("The end");
}
}
}

Select 2 option(s):

If run with no arguments, the program will only print 'The end'.

If run with one argument, the program will only print 'The end'.

If run with one argument, the program will print 'Exception in Main' and 'The end'.

If run with one argument, the program will only print 'Exception in Main'.

If run with no arguments, the program will not print anything.

If run with no arguments, the program will generate a stack trace on the console.

Q16. Consider the following method:

public Map countWords(Stream wordStream){
Map counts = INSERT CODE HERE
return counts;
}

Given that wordStream is a Stream of words and that this method is supposed to return how many times each word appears in the stream, what can be inserted in the above code?

Select 1 option(s):

wordStream.collect(Collectors.groupingBy(Collectors.counting()));

wordStream.collect(Collectors.groupingBy(String::equals, Collectors.counting()));

wordStream.collect(Collectors.groupingBy(String::toUpperCase, Collectors.counting()));

wordStream.collect(Collectors.groupingBy(Function.identity(), Collectors.counting()));

None

Q17. What will the following code print when compiled and run?

public static void main(String[] args) {
Float f1 = 10.0f;
Float f2 = 0.0f;

Float f3 = null;

double f = 0.0;
try{
f = f1/f2;
System.out.println(f);
f3 = f1/f2;
}catch(Exception e){
System.out.println("Exception");
}
System.out.println(f3.isInfinite());
}

Select 1 option(s):

Exception
false

Exception
true

Exception
< stack trace for a NullPointerException >

Infinity
true

Infinity
Exception
< stack trace for a NullPointerException >

None

Q18. 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(LocalDate.now(),
LocalDate.of(2022, Month.SEPTEMBER, 1));
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
PT-14H-50M

P1D
PT9H10M

P-1D
P-9H-10M

P1D
PT14H50M

It will throw an exception at run time.

None

Q19. Given that a method named Double getPrice(String id) exists and may potentially return null, about which of the following options can you be certain that a run time exception will NOT be thrown?

Select 2 option(s):

Optional< Double > price = Optional.of(getPrice("1111"));

Optional< Double > price = Optional.ofNullable(getPrice("1111"));
Double x = price.orElse(getPrice("2222"));

Optional< Double > price = Optional.ofNullable(getPrice("1111"));
Double y = price.orElseGet(()->getPrice("333"));

Optional< Double > price = Optional.of(getPrice("1111"), 10.0);

Optional< Double > price = Optional.of(getPrice("1111"));
Double z = price.orElseThrow(()->new RuntimeException("Bad Code"));

Q20. Which of the following code fragments correctly executes the blog(String data) method of a blogging service that implements api.Blogger interface assuming that you already have a reference to the loader for this service?

Assume that data refers to the data that needs to be blogged.

Select 2 option(s):

try{
Iterator< Blogger > bi = loader.iterator();
while(bi.hasNext()){
Blogger b = bi.next();
b.blog(data);
}
}catch(ServiceConfigurationError e){ }

try{
Iterator< Blogger > bi = loader.services();
while(bi.hasNext()){
Blogger b = bi.next();
b.blog(data);
}
}catch(ServiceConfigurationError e){ }

for(Blogger b : loader.services()){
b.blog(data);
}

try{
Blogger b = loader.getService();
b.blog(data);
}catch(ServiceConfigurationError e){ }

loader.blog(data);

for (Blogger b : loader){
b.blog("Hello from textbook");
}

Q21. Consider the classes shown below:

class A{
public A() { }
public A(int i) { System.out.println(i ); }
}
class B{
static A s1 = new A(1);
A a = new A(2);
public static void main(String[] args){
B b = new B();
A a = new A(3);
}
static A s2 = new A(4);
}

Which is the correct sequence of the digits that will be printed when B is run?

Select 1 option(s):

1 ,2 ,3 4.

1 ,4, 2 ,3

3, 1, 2, 4

2, 1, 4, 3

2, 3, 1, 4

None

Q22. Which of the following statements will print /test.txt when executed on a Unix/Linux system?

Select 1 option(s):

System.out.println(Path.get("https://3ca51ebc.delivery.rocketcdn.me/test.txt"));

System.out.println(new Path("https://3ca51ebc.delivery.rocketcdn.me/test.txt"));

System.out.println(Paths.get("/", "test.txt"));

System.out.println(Path.toPath("https://3ca51ebc.delivery.rocketcdn.me/test.txt"));

System.out.println(Paths.toPath("https://3ca51ebc.delivery.rocketcdn.me/test.txt"));

None

Q23. Given:

sealed abstract class Car permits SUV, Sedan{
String name;
Car(String name){
this.name = name;
}
}

final class SUV extends Car{
int milage;
SUV(String name, int milage){
super(name);
this.milage = milage;
}
}

final class Sedan extends Car{
double price;
Sedan(String name, double price){
super(name);
this.price = price;
}
}

public class TestClass
{

public static void main(String args[]) throws Exception
{
Car[] cars = new Car[]{ new SUV("Ford", 5000), new Sedan("Honda", 10000.0),
new SUV("Chevy", 10000), new Sedan("Toyota", 20000.0)};

DoubleSummaryStatistics dss =
Stream.of(cars)
.filter(c->c instanceof SUV)
.collect(Collectors.summarizingDouble(c-> ((SUV)c).milage));

System.out.println(dss.getMax());

String sedans =
Stream.of(cars)
.filter(c->c instanceof Sedan)
.collect(Collectors.mapping(c->c.name, Collectors.joining(",")));

System.out.println(sedans);

}
}

What is the result?

Select 1 option(s):

10000
Honda,Toyota

10000.0
Honda,Toyota

10000.0
Ford,Honda,Chevy,Toyota

ClassCastException at run time.

Compilation failure.

None

Q24. Consider the following code snippet:

for(var i=INT1; i<INT2; i++){
System.out.println(i);
}

INT1 and INT2 can be any two integers.

Which of the following will produce the same result?

Select 1 option(s):

for(int i=INT1; i<INT2; System.out.println(++i));

for(int i=INT1; i++<INT2; System.out.println(i));

int i=INT1; while(i++<INT2) { System.out.println(i); }

int i=INT1; do { System.out.println(i); }while(i++<INT2);

None of these.

None

Q25. Consider the following program:

import java.io.FileReader;
import java.io.FileWriter;

public class ClosingTest {
public static void main(String[] args) throws Exception {
try(FileReader fr = new FileReader("c:\\temp\\license1.txt");
FileWriter fw = new FileWriter("c:\\temp\\license2.txt") )
{
int ch = -1;
while( (ch = fr.read()) != -1){
fw.write(ch);
}
}
}
}

Identify the correct statements.

Select 1 option(s):

The FileWriter object will always be closed before the FileReader object.

The order of the closure of the FileWriter and FileReader objects is platform dependent and should not be relied upon.

The FileWriter object will not be closed if an exception is thrown while closing the FileReader object.

This is not a fail safe approach to managing resources because in certain situations one or both of the resources may be left open after the end of the try block.

None

Q26. Consider the following code:

Instant ins = Instant.now();
System.out.println(ins);

Given that the local time where the code is run is 3PM and the local time zone is 2 hours ahead of UTC, what will the above code print?
(Assume that the date is 20th Jan 2022).

Select 1 option(s):

2022-01-20T13:00:00.001Z

2022-01-20T15:00:00.001Z

2022-01-20T11:00:00.001Z

2022-01-20T01:00:00.001Z

2022-01-20T03:00:00.001Z

None

Q27. What will the following code print when run?

String[] sa = { "Charlie", "bob", "1one", "-one" };
Collections.sort(Arrays.asList(sa), null);
System.out.println(sa[0]);

Select 1 option(s):

Charlie

bob

-one

1one

None

Q28. Given:

double amount = 200_00.00;
NumberFormat nf1 = NumberFormat.getCurrencyInstance(Locale.US);
NumberFormat nf2 = NumberFormat.getCompactNumberInstance(Locale.US, Style.SHORT);
System.out.println(nf1.format(amount));
System.out.println(nf2.format(amount));

What will be the output?

Select 1 option(s):

$20,000.00
20000

$20,000.00
20K

$20,000.00
200000.00

20,000.00
20000

None

Q29. Consider the following classes:

class A implements Runnable{ ...}
class B extends A implements Observer { ...}
(Assume that Observer has no relation with Runnable.)

and the declarations :

A a = new A() ;
B b = new B();

Which of the following Java code fragments will compile and execute without throwing exceptions?

Select 2 option(s):

Object o = a; Runnable r = o;

Object o = a; Runnable r = (Runnable) o;

Object o = a; Observer ob = (Observer) o ;

Object o = b; Observer o2 = o;

Object o = b; Runnable r = (Runnable) b;

Q30. Given:

var sList = new CopyOnWriteArrayList();
Which of the following statements are correct?

Select 1 option(s):

Student class must be Cloneable or Serializable.

Student objects retrieved from sList are thread safe.

Multiple threads can get Student objects from sList but can't add to it in a thread safe manner simultaneously.

Multiple threads can safely add and remove objects from sList simultaneously.

Any code that adds objects to sList must be synchronized but code that gets objects need not be.

If a thread tries to add an object to it while another is iterating through the list, the second thread may get ConcurrentModificationException.

You cannot add null to sList.

None

Q31. What will the following program print when run?

public class Operators{

public static int operators(){
int x1 = -4;
int x2 = x1--;
int x3 = ++x2;
if(x2 > x3){
--x3;
}else{
x1++;
}
return x1 + x2 + x3;
}
public static void main(String[] args) {
System.out.println(operators());
}
}

Select 1 option(s):

-9

-10

-11

-12

None

Q32. Given:

public List getList(){
*INSERT CODE HERE*
}

What can be inserted in the above code?

Select 3 option(s):

return new ArrayList< Integer >();

return new ArrayList< Number >();

return new ArrayList< Object >();

return new ArrayList();

return new ArrayList< ? super Number >();

return new ArrayList< ? extends Number >();

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:\\main\\project\\Starter.java");

public static String getData(){
String data = p1.getName(0).toString();
return data;
}

public static void main(String[] args) {
System.out.println(getData());
}
}

Select 1 option(s):

IllegalArgumentException

ArrayIndexOutOfBoundsException

c:\

main

None

Q34. What will be the result of attempting to compile and run the following class?

public class TestClass{
public static void main(String args[ ] ){
int i, j, k;
i = j = k = 9;
System.out.println(i);
}
}

Select 2 option(s):

The code will not compile because unlike in c++, operator '=' cannot be chained i.e. a = b = c = d is invalid.

The code will not compile as 'j' is being used before getting initialized.

The code will compile correctly and will display '9' when run.

The code will not compile as 'j' and 'i' are being used before getting initialized.

All the variables will get a value of 9.

Q35. Given:

record Course(String code, String name){}
record Student(int id, String name) {}
record Relation(X x, Y y){}

and the code:

public class Test{
public static void main(String[] args) {
Student s = new Student(123, "Bob");
Course c = new Course("CS102", "Data Structures");
Relation enrollment = new Relation(s, c);

//INSERT CODE HERE
}
}

What can be inserted in the above code so that it will print:
Bob enrolled in CS102

Select 1 option(s):

if(enrollment instanceof Relation<>(var a, var b) && a.id() == 123){
System.out.println(a.name()+" enrolled in "+b.code());
}

if(enrollment instanceof Relation(var a, var b) && a.id() == 123){
System.out.println(a.name()+" enrolled in "+b.code());
}

if(enrollment instanceof Relation(Student a, Course b) && a.id() == 123){
System.out.println(a.name+" enrolled in "+b.code);
}

if(enrollment instanceof Relation(Student s, Course c) || !(s.id() == 123)){
System.out.println(s.name()+" enrolled in "+c.code());
}

None

Q36. Your application is packaged in myapp.jar and depends on a jar named datalayer.jar, which in turn depends on mysql-connector-java-8.0.11.jar. The following packages exist in these jars:

myapp.jar: com.abc.myapp
datalayer.jar: com.abc.datalayer
mysql-connector-java-8.0.11.jar: com.mysql.jdbc

You want to use bottom up approach for migrating your app to a modular app. Which of the following is required before you can do this?

Select 1 option(s):

Mysql driver jar and datalayer.jar must first be converted into modular jars.

datalayer.jar must first be converted into modular jar. The mysql jar need not be converted.

The mysql jar must first be converted into modular jar. The datalayer.jar need not be converted.

Neither datalayer nor mysql driver need to be converted into modular jars.

None

Q37. Which of the following statements are correct about --jdk-internals option of jdeps tool when run on a jar file or a class file?

Select 2 option(s):

It analyzes all classes of the given jar file for class level dependence on Java API.

It analyzes all classes of the given jar file for class level dependence on jdk's deprecated API. If any such dependence is found, it is printed with a suggestion for replacement.

It analyzes all classes of the given jar file for class level dependence on jdk's internal API. If any such dependence is found, it is printed with a suggestion for replacement.

It analyzes all input modules and list all jdk internal modules on which the input modules depend. If any such dependence is found, it is printed with a suggestion for replacement.

It can only be used with -summary or -verbose options.

It performs static analysis.

Q38. What will the following code print when compiled and run?

List ls = Arrays.asList(1, 2, 3);
ls.stream().forEach(System.out::print)
.map(a->a*2)
.forEach(System.out::print);

Select 1 option(s):

123

246

Compilation failure

exception at run time

None

Q39. What can be inserted in the following code at //1 so that it will print the number of lines present in the given file?

public void countLines(String filePath) throws Exception{
//1
System.out.println(ref.count());
}

Select 2 option(s):

Stream< String > ref = new BufferedReader(new FileReader(filePath)).lines();

Stream< String > ref = new BufferedReader(new FileReader(Paths.get(filePath))).lines();

Stream< String > ref = new BufferedReader(new FileReader(filePath)).readLines();

Stream< String > ref = Files.lines(filePath);

Stream< String > ref = Files.lines(Paths.get(filePath));

Q40. Given:

class Booby{
}
class Dooby extends Booby{
}
class Tooby extends Dooby{
}

and the following declarations:

List bV = null;
List tV = null;

Which of the following statements will compile without any error?

Select 1 option(s):

bV.add( tV.get(0) );

tV.add( bV.get(0) );

bV = tV;

tV = bV;

None of the above.

None

Q41. Given:

List dList = Arrays.asList(10.0, 12.0);
dList.stream().forEach(x->{ x = x+10; });
dList.stream().forEach(d->System.out.println(d));

What will it print when compiled and run?

Select 1 option(s):

A compilation error will occur.

10.0
12.0

20.0
22.0

It will compile but throw an exception at run time.

None

Q42. Which jdeps option(s) is/are used to include dependent nonmodular jar files?

Note: We have seen some really vague and ill-designed questions without complete information on jdeps in the exam. It is anybody's guess as to what exactly are they testing.

Based on the given options, our guess is that in this question they are just checking whether you know that -cp, -classpath, and --class-path are equivalent options and the nonmodular jars should be put on classpath instead of module-path.

Select 3 option(s):

jdeps -cp file1.jar;file2.jar app.jar

jdeps --upgrade-module-path file1.jar;file2.jar app.jar

jdeps --class-path file1.jar;file2.jar app.jar

jdeps -classpath file1.jar;file2.jar app.jar

jdeps app.jar

jdeps --module-path file1.jar;file2.jar app.jar

jdeps file1.jar;file2.jar app.jar

Q43. What will the following program snippet print?

int i=0, j=11;
do{
if(i > j) { break; }
j--;
}while( ++i < 5);
System.out.println(i+" "+j);

Select 1 option(s):

5 5

5 6

6 6

6 5

4 5

None

Q44. Identify correct statements about the modular JDK.

Select 3 option(s):

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

The modular JDK is composed of two modules - the java module and the jdk module.

JDK is divided into a set of modules that can be combined at compile time, build time, and run time into a variety of configurations.

The modular JDK is divided of two kinds of modules - the standard modules and the non-standard modules.

Q45. Given the following code fragment:

SequencedCollection cities = List.of("USA", "Netherlands", "UK", "India", "France"); //1
Comparator c = (a, b)->a.compareTo(b);
Comparator cr = c.reversed();//2
String joined = cities.stream().sorted(cr).collect(Collectors.joining(", "));//3
System.out.println(joined);

What is the result?

Select 1 option(s):

Compilation error at //1.

Compilation error at //2.

Compilation error at //3.

USA, UK, Netherlands, India, France

USA, Netherlands, UK, India, France

France, India, Netherlands, UK, USA

None

Q46. What will be the result of attempting to compile and run class B?

class A{
final int fi = 10;
}
public class B extends A{
int fi = 15;
public static void main(String[] args){
B b = new B();
b.fi = 20;
System.out.println(b.fi);
System.out.println( ( (A) b ).fi );
}
}

Select 1 option(s):

It will not compile.

It will print 10 and then 10

It will print 20 and then 20

It will print 10 and then 20

It will print 20 and then 10

None

Q47. What will the following lines of code print

java.time.LocalDate dt =
java.time.LocalDate.parse("2015-01-01")
.minusMonths(1).minusDays(1).plusYears(1);
System.out.println(dt);

Select 1 option(s):

Compilation error.

Exception at run time.

2015-12-31

2015-11-30

None

Q48. Given the following directory structure:

finmodule:
p1:
InterestCalculator.java
p2:
FinMath.java

and the following definition:

//in file finmodule/p1/InterestCalculator.java
package p1;
public sealed class InterestCalculator permits CompoundIntCalculator{
}

Which of the following is/are valid definition(s) of CompoundIntCalculator class?

Select 3 option(s):

package p1;
public class CompoundIntCalculator extends InterestCalculator{ }

package p1;
non-sealed abstract class CompoundIntCalculator extends InterestCalculator{ }

package p1.p2;
public non-sealed class CompoundIntCalculator extends InterestCalculator{ }

package p1;
final class CompoundIntCalculator extends InterestCalculator{ }

package p1.p2;
public sealed class CompoundIntCalculator extends InterestCalculator{ }

package p1;
public non-sealed class CompoundIntCalculator extends InterestCalculator{ }

Q49. Given:

enum Title
{
MR("Mr."), MS1("Ms."), MS2("Ms.");
private String title;
private Title(String s){
title = s;
}
}

public class TestClass{
public static void main(String[] args) {
var ts = new Set();
ts.add(Title.MS2);
ts.add(Title.MR);
ts.add(Title.MS1);
for(Title t : ts){
System.out.println(t);
}
}
}

What will be the output when TestClass is compiled and run?

Select 1 option(s):

It will print MR, MS1, MS2, but the order is unpredictable.

MS2, MR, MS1,

MR, MS1, MS2,

It will not compile.

None

Q50. What will the following code print when run?

class Baap {
public int h = 4;
public int getH() {
System.out.println("Baap " + h);
return h;
}
}

public class Beta extends Baap {
public int h = 44;
public int getH() {
System.out.println("Beta " + h);
return h;
}
public static void main(String[] args) {
Baap b = new Beta();
System.out.println(b.h + " " + b.getH());
Beta bb = (Beta) b;
System.out.println(bb.h + " " + bb.getH());
}
}

Select 1 option(s):

Beta 44
4 44
Baap 44
44 44

Baap 44
4 44
Beta 44
44 44

Beta 44
4 44
Beta 44
4 44

Beta 44
4 44
Beta 44
44 44

None

Time's up

Java Standard Test 1 – 2025

Q1. Which of the following is/are valid record definition(s)?

Q2. Which of these expressions will obtain the substring "456" from a string defined by

Q3. Java's Exception mechanism helps in which of the following ways?

Q4. Given :

Q5. Given:

Q6. Given the following classes, what will be the output of compiling and running the class Truck?

Q7. Given:

Q8. What will the following code print when compiled and run?

Q9. What will the following code print when run?

Q10. What will be the result of attempting to compile and run the following program?

Q11. You want to change the default locale for formatting numbers, currency, and percentages. Which of the following statements will achieve that?

Q12. Given:

Q13. What will be the output of the following code:

Q14. Given that your code is being run in a locale where the language code is fr and country code is CA, which of the following file names represents a valid resource bundle file name?

Q15. Considering the following program, which of the options are true?

Q16. Consider the following method:

Q17. What will the following code print when compiled and run?

Q18. What will the following code print when run?

Q19. Given that a method named Double getPrice(String id) exists and may potentially return null, about which of the following options can you be certain that a run time exception will *NOT* be thrown?

Q20. Which of the following code fragments correctly executes the blog(String data) method of a blogging service that implements api.Blogger interface assuming that you already have a reference to the loader for this service?

Q21. Consider the classes shown below:

Q22. Which of the following statements will print /test.txt when executed on a Unix/Linux system?

Q23. Given:

Q24. Consider the following code snippet:

Q25. Consider the following program:

Q26. Consider the following code:

Q27. What will the following code print when run?

Q28. Given:

Q29. Consider the following classes:

Q30. Given:

Q31. What will the following program print when run?

Q32. Given:

Q33. What will the following code print when run?

Q34. What will be the result of attempting to compile and run the following class?

Q35. Given:

Q36. Your application is packaged in myapp.jar and depends on a jar named datalayer.jar, which in turn depends on mysql-connector-java-8.0.11.jar. The following packages exist in these jars:

Q37. Which of the following statements are correct about --jdk-internals option of jdeps tool when run on a jar file or a class file?

Q38. What will the following code print when compiled and run?

Q39. What can be inserted in the following code at //1 so that it will print the number of lines present in the given file?

Q40. Given:

Q41. Given:

Q42. Which jdeps option(s) is/are used to include dependent nonmodular jar files?

Q43. What will the following program snippet print?

Q44. Identify correct statements about the modular JDK.

Q45. Given the following code fragment:

Q46. What will be the result of attempting to compile and run class B?

Q47. What will the following lines of code print

Q48. Given the following directory structure:

Q49. Given:

Q50. What will the following code print when run?

Q19. Given that a method named Double getPrice(String id) exists and may potentially return null, about which of the following options can you be certain that a run time exception will NOT be thrown?