Java Standard Test 11 – 2025

Q1. Given the following resource bundle files:

In file msgs.properties:
accountinfo={0} = {1}

In file msgs_en.properties:
accountinfo={0}''s balance is {1}
(Note that an extra ' is used to escape '.)

In file msgs_en_GB.properties:
accountinfo=Hi {0}, your balance is {1}

In file msgs_fr.properties:
accoutinfo=Salut {0}, ton solde est de {1}
(Note that the key name has a typing mistake in this file.)

What will the following code print?
public class TestClass {
public static void showBalance(String ownerName){
Locale.setDefault(Locale.of("en", "GB"));
ResourceBundle rb = ResourceBundle.getBundle("msgs", Locale.of("fr"));
NumberFormat nf = NumberFormat.getCurrencyInstance();
String message = rb.getString("accountinfo");
message = MessageFormat.format(message, ownerName, nf.format(100));
System.out.println(message);
}
public static void main(String[] args) {
showBalance("Bob");
}
}

Select 1 option(s):

Q2. Given:

public static void createFile(String name) throws Exception{
try (
OutputStream os = new FileOutputStream(name); ) {

//INSERT CODE HERE

//flush and close the streams that are open
}

}

Which of the following combinations of the lines of code and their outcome when inserted above, are correct?

Select 2 option(s):

Q3. Given the following code:

List aList = List.of(40, 30, 20); //1
List bList = List.copyOf(aList); //2

bList.sort((Integer::compare)); //3
System.out.println( bList ); //4

aList.sort((Integer::compare)); //5
System.out.println( aList ); //6

Identify correct statement.

Select 1 option(s):

Q4. What will the following program print?

class LoopTest{
public static void main(String args[]) {
var counter = 0;
outer:
for (var i = 0; i < 3; i++) {
middle:
for (var j = 0; j < 3; j++) {
inner:
for (var k = 0; k < 3; k++) {
if (k - j > 0) {
break middle;
}
counter++;
}
}
}
System.out.println(counter);
}
}

Select 1 option(s):

Q5. What will be the output when the following code is compiled and run?

//in file Test.java
class E1 extends Exception{ }
class E2 extends E1 { }
class Test{
public static void main(String[] args){
try{
throw new E2();
}
catch(E1 e){
System.out.println("E1");
}
catch(Exception e){
System.out.println("E");
}
finally{
System.out.println("Finally");
}
}
}

Select 1 option(s):

Q6. Given the following code:

var raf = new RandomAccessFile("c:\\temp\\test.txt", "rwd");
raf.writeChars("hello");
raf.close();

Which of the following statements are correct?

(Assume that the code has appropriate security permissions.)

Select 1 option(s):

Q7. What will the following code print when compiled and run?

var nameList = new ArrayList();
nameList.add("Ally");
nameList.add("Billy");
nameList.add("Cally");
nameList.add("Billy");
nameList.add("Ally");

var nameSet1 = new HashSet();
for(var name:nameList) nameSet1.add(name);
var nameSet2 = new HashSet(nameList);
System.out.println(nameList.size()+" "+nameSet1.size()+" "+nameSet2.size());

Select 1 option(s):

Q8. Given:

public record Book(String title, Double price){ };

What will the following code print?

List books = Arrays.asList(
new Book("Gone with the wind", 5.0),
new Book("Gone with the wind", 10.0),
new Book("Atlas Shrugged", 15.0)
);
books.stream().collect(Collectors.toMap((b->b.title()), b->b.price()))
.forEach((a, b)->System.out.println(a+" "+b));

Select 1 option(s):

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

public class TestClass {

public static void main(String[] args){
var k = 2;
while(--k){
System.out.println(k);
}
}
}

Select 1 option(s):

Q10. Identify correct statements about java.io.Console class?

Select 1 option(s):

Q11. Identify correct statements about Java exceptions.

Select 1 option(s):

Q12. You are writing a piece of code that determines taxRate on a given grossIncome. The taxRate is to be computed as follows -

If grossIncome is less than or equals to 18000, taxRate is 0.
If grossIncome is more than 18000 but less than or equal to 36000, taxRate is 10%
If grossIncome is more than 36000, taxRate is 20%.

Which of following code fragments do it correctly?

Select 3 option(s):

Q13. What will the following code print?

Duration d = Duration.ofDays(1);
System.out.println(d);
d = Duration.ofMinutes(0);
System.out.println(d);
Period p = Period.ofMonths(0);
System.out.println(p);

Select 1 option(s):

Q14. What will the following code print when compiled and run?

var tickers = List.of("A", "D", "E", "C", "A");
var ratio = List.of(1.0, 1.2, 1.5, 1.8, 2.0);
var map1 = IntStream.range(0, tickers.size())
.boxed()
.collect(Collectors.toMap(
i -> tickers.get(i),
i -> 1.0/ratio.get(i), (x, y) -> x+y)) ; //<<----- LINE 1

var map2 = map1.entrySet().stream().sorted(Map.Entry.comparingByKey())
.collect(
Collectors.toMap(
Map.Entry::getKey,
Map.Entry::getValue,
(x, y) -> x-y,
LinkedHashMap::new)
); //<<----- LINE 2

map2.forEach((var k, var v)->System.out.printf("%s = %.2f\n",k, v));

Select 1 option(s):

Q15. What will the following program print when run?

public class ChangeTest {

private int myValue = 0;

public void showOne(int myValue){
myValue = myValue;
System.out.println(this.myValue);
}

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

Select 1 option(s):

Q16. What will the following code snippet print?

List s1 = new ArrayList( );
try{
while(true){
s1.add("sdfa");
}
}catch(RuntimeException e){
e.printStackTrace();
}
System.out.println(s1.size());

Select 1 option(s):

Q17. Which is the earliest line in the following code after which the object created on line // 1 can be garbage collected, assuming no compiler optimizations are done?

public class NewClass{
private Object o;
void doSomething(Object s){ o = s; }

public static void main(String args[]){
Object obj = new Object(); // 1
NewClass tc = new NewClass(); //2
tc.doSomething(obj); //3
obj = new Object(); //4
obj = null; //5
tc.doSomething(obj); //6
}
}

Select 1 option(s):

Q18. Which statements about the following code are correct?

interface House{
public default String getAddress(){
return "101 Main Str";
}
}

interface Office {
public default String getAddress(){
return "101 Smart Str";
}
}

class HomeOffice implements House, Office{
public String getAddress(){
return "R No 1, Home";
}
}

public class TestClass {

public static void main(String[] args) {
House h = new HomeOffice(); //1
System.out.println(h.getAddress()); //2
}
}

Select 1 option(s):

Q19. Identify correct statements about the following code:

import java.util.*;

class Student{
int marks;
}

class TestClass {
var k = new Student(); //1

public static void main(String[] args) {

var s = new Student(){ //2
@Override
public String toString(){ return "student obj"; };
};

var slist = Set.of(new Student()); //3

for(var i : slist){ //4
System.out.println(i);
}

slist.removeIf((var s1) -> s1.marks<0); //5
}
}

Select 1 option(s):

Q20. Given:

class T extends Thread
{
public static Lock lock = new ReentrantLock();

public T(String name){ super(name); }

static StringBuilder data = new StringBuilder();

public void run()
{
if(lock.tryLock()){
try{
lock.lock();
data.append("hello");
}finally{
lock.unlock();
}
}
}
}
public class TestClass
{
public static void main(String args[]) throws Exception
{
T t1 = new T("T1");
t1.start();
try{
t1.lock.lock();
System.out.println(t1.data);
}finally{
t1.lock.unlock();
}

}
}

Identify correct statement(s) about the above code.

Select 2 option(s):

Q21. Given:

module abc.print{
requires org.pdf;
provides org.pdf.Print with com.abc.print.PrintImpl;
}

Identify correct statements about the above module.

Select 1 option(s):

Q22. Given:

public static float parseFloat1(String s1){
try{
return Float.parseFloat(s1);
}catch(NumberFormatException e){
return 0.0f;
}catch(IllegalArgumentException e){
return Float.NaN;
}
}

Identify correct statements.

Select 1 option(s):

Q23. Given:

enum Card
{
HEART, CLUB, SPADE, DIAMOND;
}

Which of the following code fragments will print
HEART CLUB SPADE DIAMOND
in that order?

Select 1 option(s):

Q24. What will be the result of attempting to compile and run the following program?

public class TestClass{
public static void main(String args[]){
try{
RuntimeException re = null;
throw re;
}
catch(Exception e){
System.out.println(e);
}
}
}

Select 1 option(s):

Q25. What will the following code print?

var ca = new char[]{'a', 'b', 'c', 'd', 'e'};
var i = 0;
for(var c : ca){
switch(c){
case 'a' -> i++;
case 'b' -> ++i;
case 'c', 'd' -> i++;
}
}
System.out.println("i = "+i);

Select 1 option(s):

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

class StringWrapper {
private String theVal;
public StringWrapper(String str){ this.theVal = str; }
}
public class Tester{
public static void main(String[] args) {
StringWrapper sw = new StringWrapper("How are you?");
StringBuilder sb = new StringBuilder("How are you?");
System.out.println("Hello, "+sw);
System.out.println("Hello, "+sb);
}
}

Select 1 option(s):

Q27. Which of the following statements are acceptable?

Select 4 option(s):

Q28. Given:

List letters = Arrays.asList("j", "a", "v","a");
String word = INSERT CODE HERE
System.out.println(word);

Which of the following code fragments when inserted in the above code independent of each other will cause it to print java?

Select 1 option(s):

Q29. What will be a part of the output when the following code is compiled and run?

class Boo {
int boo = 10;
public Boo(int k){ System.out.println("In Boo k = "+k); boo = k;}
}

class BooBoo extends Boo {
public BooBoo(int k ){ super(k); System.out.println("In BooBoo k = "+k); }
}

class Moo extends BooBoo implements Serializable {
int moo = 10;
public Moo(){ super(5); System.out.println("In Moo"); }
}

public class TestClass {

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

var moo = new Moo();
var fos = new FileOutputStream("c:\\temp\\moo1.ser");
var os = new ObjectOutputStream(fos);
os.writeObject(moo);
os.close();
var fis = new FileInputStream("c:\\temp\\moo1.ser");
var is = new ObjectInputStream(fis);
moo = (Moo) is.readObject();
is.close();
}
}

Select 3 option(s):

Q30. Given:

record Person(String name, char gender){};

What will be the output of the following code:

Stream.of(new Person("Bob", 'M'), new Person("Rita", 'F'),
new Person("Mukesh", 'M'), new Person("Amita", 'T'),
new Person("Sonya", 'F'))
.takeWhile(p->p.gender()=='M' || p.gender()=='F')
.sorted( (p1, p2) -> p2.name().compareTo(p1.name()))
.dropWhile(p->p.name().length()<5)
.forEach(p->System.out.print(p.name()));

Select 1 option(s):

Q31. What will the following code print when compiled and run?

List messages =
Arrays.asList(new StringBuilder(), new StringBuilder());
messages.stream().forEach(s->s.append("helloworld"));
messages.forEach(s->{
s.insert(5,",");
System.out.println(s);
});

Select 1 option(s):

Q32. Consider :

class A { public void perform_work(){} }
class B extends A { public void perform_work(){} }
class C extends B { public void perform_work(){} }

How can you let perform_work() method of A to be called from an instance method in C?

Select 1 option(s):

Q33. What will the following code print when compiled and run?

Select 1 option(s):

Q34. Complete the following code:

enum Card {
CLUB, DIAMOND, HEART, SPADE
}

public class TestClass{

public static String getColor(Card c){

INSERT CODE HERE

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

Select 2 option(s):

Q35. What will be the output of the following program?

class TestClass{
public static void main(String[] args) throws Exception{
try{
amethod();
System.out.println("try ");
}
catch(Exception e){
System.out.print("catch ");
}
finally {
System.out.print("finally ");
}
System.out.print("out ");
}
public static void amethod(){ }
}

Select 1 option(s):

Q36. What will the following code print?

DateTimeFormatter df = DateTimeFormatter.ofPattern("eeee");
LocalDate d = LocalDate.of(2000, 1, 1); //assume that it was Saturday on this date
System.out.println(df.format(d));

Select 1 option(s):

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

public class Device implements AutoCloseable{
boolean open = false;
int index;
public Device(int index){
this.index = index;
open = true;
}

public void write() throws IOException{
throw new RuntimeException("Can't write!");
}

public void close(){
open = false;
System.out.println("Device closed "+index);
}

public static void main(String[] args) {
Device d1 = new Device(1);
try(d1;
Device d2 = new Device(2);
Device d3 = new Device(3)){
d2.write();
d1.close();
}catch(Exception e){
System.out.println("Got Exception "+e.getMessage());
}
}
}

Select 1 option(s):

Q38. What will be the result of compiling and running the following code?

class Base{
public Object getValue(){ return new Object(); } //1
}

class Base2 extends Base{
public String getValue(){ return "hello"; } //2
}

public class TestClass{
public static void main(String[] args){
Base b = new Base2();
System.out.println(b.getValue()); //3
}
}

Select 1 option(s):

Q39. Consider the following code:

public class TestOuter
{
public void myOuterMethod()
{
// 1
}
public class TestInner { }
public static void main(String[] args)
{
var to = new TestOuter();
// 2
}
}

Which of the following options correctly instantiates a TestInner object?

Select 2 option(s):

Q40. Which digits and in what order will be printed when the following program is run?

public class TestClass{
public static void main(String args[]){
int k = 0;
try{
int i = 5/k;
}
catch (ArithmeticException e){
System.out.println("1");
}
catch (RuntimeException e){
System.out.println("2");
return ;
}
catch (Exception e){
System.out.println("3");
}
finally{
System.out.println("4");
}
System.out.println("5");
}
}

Select 1 option(s):

Q41. Which of the following statements about deadlock is correct?

Select 1 option(s):

Q42. What will the following code print when run?

class MyCallable implements Callable{
public String call() throws Exception {
Thread.sleep(50000);
return "DONE";
}
}
public class TestClass {

public static void main(String[] args) throws Exception {
var es = Executors.newSingleThreadExecutor();
var future = es.submit(new MyCallable());
System.out.println(future.get()); //1
es.shutdownNow(); //2
}
}

Select 1 option(s):

Q43. Which of the following declarations is/are valid inside a static method:

1. bool b = null;

2. boolean b = 1;

3. boolean b = true|false;

4. bool b = (10<11);

5. boolean b = true||false;

6. var b = 10>11;

Select 1 option(s):

Q44. Given:

public class TestClass
{
public static void main(String args[])
{
B b = new C();
A a = b;

INSERT CODE HERE

}
}
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"); }
}

What can be inserted in the above code?

Select 3 option(s):

Q45. What will the following class print when executed?

class Test{
static boolean a;
static boolean b;
static boolean c;
public static void main (String[] args){
boolean bool = (a = true) || (b = true) && (c = true);
System.out.print(a + ", " + b + ", " + c);
}
}

Select 1 option(s):

Q46. Given:

abstract class Base{
abstract int power();
}

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

class AA extends A{
@Override
int power(){ return 1; }
void mAA(){
System.out.println("mAA");
}
}

class B extends Base{
@Override
int power(){ return 1; }
}

public class TestClass
{

void processBase(Base base){
INSERT CODE HERE
}

}

What can be inserted in the above code?

Select 2 option(s):

Q47. Given:

public class TestClass
{
static class Calculation implements Runnable
{
int result;
public void run()
{
synchronized(this){
try{
Thread.sleep(5000); //LINE 10
result = 101;
}catch(Exception e){ e.printStackTrace(); }
}
}
}
public static void main(String args[]) throws Exception
{
Calculation c = new Calculation();
Thread.Builder tb = Thread.ofPlatform();
Thread t = tb.unstarted(c);
t.start();
Thread.sleep(100);
synchronized(c){ //LINE 21
System.out.println("Result is "+c.result);
}
}

}

Assuming that the calculation thread has just executed the line marked //LINE 10 and the main thread has just executed the line marked //LINE 21, what are the states of the two threads?

Select 1 option(s):

Q48. Given:

public class Book{
private String title;
private Double price;
public Book(String title, Double price){
this.title = title;
this.price = price;
}
//accessor methods not shown
}

What will the following code print when compiled and run?

Book b1 = new Book("Java in 24 hrs", 30.0);
Book b2 = new Book("Thinking in Java", null);
Supplier s1 = b1::getPrice;
System.out.println(b1.getTitle()+" "+s1.get());
Supplier s2 = b2::getPrice;
System.out.println(b2.getTitle()+" "+s2.getAsDouble());

Select 1 option(s):

Q49. Consider that str is a local variable of class java.lang.String.

Which of the following lines of code may throw a NullPointerException in certain situations?

Or a tougher version of the question could be :
Which of the following lines of code are not an example of robust design ?

Select 3 option(s):

Q50. You are creating an acme.accounting module that depends on acme.math module and makes its com.acme.accounting package available to all other modules. Which of the following files correctly defines this module?

Select 1 option(s):