Java Standard Test 10 – 2025

Q1. What is the result of executing the following fragment of code:

boolean b1 = false;
boolean b2 = false;
if (b2 != b1 = !b2){
System.out.println("true");
}
else{
System.out.println("false");
}

Select 1 option(s):

Q2. 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_fr_FR.properties:
accountinfo=Salut {0}, ton solde est de {1}


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"));
String message = rb.getString("accountinfo");
message = MessageFormat.format(message, ownerName, NumberFormat.getCurrencyInstance().format(100));
System.out.println(message);
}
public static void main(String[] args) {
showBalance("Bob");
}
}

Select 1 option(s):

Q3. What will the following code print?

List s1 = new ArrayList( );
s1.add("a");
s1.add("b");
s1.add("c");
s1.add("a");
if(s1.remove("a")){
if(s1.remove("a")){
s1.remove("b");
}else{
s1.remove("c");
}
}

System.out.println(s1);

Select 1 option(s):

Q4. Given:

enum Card
{
HEART, CLUB, SPADE, DIAMOND;

public boolean isRed(){
return switch(this){
case HEART, DIAMOND -> true;
default -> false;
};
}
}


What will the following line of code print?

Arrays.stream(Card.values()).takeWhile(c->c.isRed()).forEach(System.out::print);

Select 1 option(s):

Q5. Identify correct statements about following command:

java -p .\dir1 -cp .\dir2 -m a.b/a.b.c.Main

Select 1 option(s):

Q6. You are creating an acme.db module. This module contains a com.acme.DB class that will be used by other modules of your application. Which of the following files correctly defines the acme.db module?

Select 1 option(s):

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

public class Data{
int value;
Data(int value){
this.value = value;
}
public String toString(){ return ""+value; }

public static void main(String[] args) {
Data[] dataArr = new Data[]{ new Data(1),
new Data(2), new Data(3), new Data(4) };

List dataList = Arrays.asList(dataArr); //1

for(Data element : dataList){

dataList.removeIf( (Data d) -> { return d.value%2 == 0; } ); //2

System.out.println("Removed "+d+", "); //3
}
}
}

Select 1 option(s):

Q8. What would be the result of attempting to compile and run the following code?

// Filename: TestClass.java
public class TestClass{
public static void main(String args[]){
B c = new C();
System.out.println(c.max(10, 20));
}
}
class A{
int max(int x, int y) { if (x>y) return x; else return y; }
}
class B extends A{
int max(int x, int y) { return 2 * super.max(x, y) ; }
}
class C extends B{
int max(int x, int y) { return super.max( 2*x, 2*y); }
}

Select 1 option(s):

Q9. Which of the following are present on the "module-path"?

Select 1 option(s):

Q10. Given:

public class Counter{
//1
public void increment(){
//2
}
//other valid code
}

This class is supposed to keep an accurate count for the number of times the increment method is called. Several classes share an instance of this class and call its increment method. What should be inserted at //1 and //2?

Select 1 option(s):

Q11. What is the result of compiling and running this code?

class MyException extends Throwable{}
class MyException1 extends MyException{}
class MyException2 extends MyException{}
class MyException3 extends MyException2{}
public class ExceptionTest{
void myMethod() throws MyException{
throw new MyException3();
}
public static void main(String[] args){
ExceptionTest et = new ExceptionTest();
try{
et.myMethod();
}
catch(MyException me){
System.out.println("MyException thrown");
}
catch(MyException3 me3){
System.out.println("MyException3 thrown");
}
finally{
System.out.println(" Done");
}
}
}

Select 1 option(s):

Q12. What will the following code print when compiled and run?

var numA = new Integer[]{1, null, 3}; //1
var list1 = List.of(numA); //2
var list2 = Collections.unmodifiableList(list1); //3
numA[1] = 2; //4
System.out.println(list1+" "+list2);

Select 1 option(s):

Q13. What will the following code print?

int i = 1;
int j = i++;
if( (i==++j) | (i++ == j) ){
i+=j;
}
System.out.println(i);

Select 1 option(s):

Q14. Which of the following statements are true regarding the try-with-resources statement?

Select 1 option(s):

Q15. Given the following module-info:

module book{
requires org.pdf;
uses org.pdf.Print;
}

Which of the following statements are correct?

Select 3 option(s):

Q16. Consider the following code:

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

Which of the following statements are correct?

Select 2 option(s):

Q17. What will the following code print?

Duration d = Duration.ofHours(25);
System.out.println(d);
Period p = Period.ofDays(1);
System.out.println(p);

Select 1 option(s):

Q18. Which of the following statements correctly create a virtual thread?

(Assume that r refers to a Runnable instance.)

Select 1 option(s):

Q19. Given:

import java.util.Iterator;
import java.util.Map.Entry;
import java.util.concurrent.ConcurrentHashMap;
public class Cache {

static ConcurrentHashMap chm = new ConcurrentHashMap();

public static void main(String[] args) {
chm.put("a", "aaa");
chm.put("b", "bbb");
chm.put("c", "ccc");

new Thread(){
public void run(){
Iterator<Entry> it = Cache.chm.entrySet().iterator();
while(it.hasNext()){
Entry en = it.next();
if(en.getKey().equals("a") || en.getKey().equals("b")){
it.remove();
}
}
}
}.start();

new Thread(){
public void run(){
Iterator<Entry> it = Cache.chm.entrySet().iterator();
while(it.hasNext()){
Entry en = it.next();
System.out.print(en.getKey()+", ");
}
}
}.start();
}
}

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

Select 1 option(s):

Q20. What changes, when applied independent of each other, will enable the following code to compile?

//assume appropriate import statements
class TestClass{
public double process(double payment, int rate)
{
double defaultrate = 0.10; //1
if(rate>10) defaultrate = rate; //2
class Implement{
public int apply(double data){
Function f = x->x+(int)(x*defaultrate); //3
return f.apply((int)data); //4
}
}
Implement i = new Implement();
return i.apply(payment);
}
}

Select 2 option(s):

Q21. Consider the following code:

class Super{
static{ System.out.print("super "); }
}
class One{
static { System.out.print("one "); }
}
class Two extends Super{
static { System.out.print("two "); }
}
class Test{
public static void main(String[] args){
One o = null;
Two t = new Two();
}
}

What will be the output when class Test is run ?

Select 1 option(s):

Q22. What will the following class print when compiled and run?

import java.util.*;

public class TestClass {

public static void main(String[] args) {

TreeSet s = new TreeSet();
TreeSet subs = new TreeSet();

for(int i = 324; i<=328; i++)
{
s.add(i);
}
subs = (TreeSet) s.subSet(326, true, 328, true );
subs.add(329);
System.out.println(s+" "+subs);

}

}

Select 1 option(s):

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

public static void main(String[] args) {
Stream<List> s1 = Stream.of(
Arrays.asList("a", "b"),
Arrays.asList("a", "c")
);

Stream news = s1.filter(s->s.contains("c"))
.flatMap(olds -> olds.stream());
news.forEach(System.out::print);
}

Select 1 option(s):

Q24. Consider the following code:

public class TestClass {

//define tester method here

public static void main(String[] args) throws Exception {
var tc = new TestClass();
while(tc.tester()){
System.out.println("running...");
}
}
}

Which of the following options would be a valid implementation of tester() method?

Select 2 option(s):

Q25. What will be the contents of d at the end of the following code?

Deque d = new ArrayDeque();
d.add(1);
d.addFirst(2);
d.pop();
d.offerFirst(3);

(Assume that in the output, front of deque is on the left side and the end is on the right side.)

Select 1 option(s):

Q26. Given:

class Base{
public List getList(int id){
return null;
};
}

class Derived extends Base{
@Override
*INSERT CODE HERE*
//valid code
}
}

What can be inserted in the above code?

Select 2 option(s):

Q27. Given the following class definitions :

interface MyIface{};
class A {};
class B extends A implements MyIface{};
class C implements MyIface{};

and the following object instantiations:

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

Which of the following assignments are legal at compile time?

Select 1 option(s):

Q28. What will be the output of compiling and running the following program:

class TestClass implements I1, I2{
public void m1() { System.out.println("Hello"); }
public static void main(String[] args){
TestClass tc = new TestClass();
( (I1) tc).m1();
}
}
interface I1{
int VALUE = 1;
void m1();
}
interface I2{
int VALUE = 2;
void m1();
}

Select 1 option(s):

Q29. What will the following code print?

String examName = "OCP Java 17";
String uniqueExamName = new String(examName);
String internedExamName = uniqueExamName.intern();
System.out.println(
(examName==uniqueExamName)+" "+
(examName == internedExamName)+" "+
(uniqueExamName == internedExamName) );

Select 1 option(s):

Q30. What will the following code print when compiled and run?

public class Onion {
private String data = "skin";

private class Layer extends Onion {
String data = "thegoodpart";
public String getData() {
return data;
}
}

public String getData() {
return new Layer().getData();
}

public static void main(String[] args) {
var o = new Onion();
System.out.println(o.getData());
}
}

Select 1 option(s):

Q31. What will the following program print when run without any command line argument?

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

var hasParams = (args == null ? false : true);
if(hasParams){
System.out.println("has params");
}{
System.out.println("no params");
}
}
}

Select 1 option(s):

Q32. Which of the following is illegal ?

Select 1 option(s):

Q33. Assuming that the file module-info.java exists in c:\\temp\\src\\foo.bar but not in c:\\temp\\out\\foo.bar and the folder foo.bar exists in c:\\temp\\out, what will happen when the following code is run?

Path p1 = Paths.get("c:\\temp\\src\\foo.bar\\module-info.java");
Path p2 = Paths.get("c:\\temp\\out\\foo.bar");
Files.move(p1, p2);

Select 1 option(s):

Q34. Which of the following options will print 10?

Select 2 option(s):

Q35. Given:

public class Course{
private String id;
private String category;

public Course(String id, String category){
this.id = id; this.category = category;
}

public String toString(){
return id+" "+category;
}

//accessors not shown
}

What will the following code print?

List s1 = Arrays.asList(
new Course("OCAJP", "Java"),
new Course("OCPJP", "Java"),
new Course("C#", "C#"),
new Course("OCEJPA", "Java")
);

s1.stream()
.collect(Collectors.groupingBy(c->c.getCategory()))
.forEach((m, n)->System.out.println(n));

Select 1 option(s):

Q36. Given:

class A{
public List getList(){
//valid code
};
}
class B extends A{
@Override
*INSERT CODE HERE*
//valid code
};
}

What can be inserted in the above code?

Select 5 option(s):

Q37. Identify correct statements about the following code:

public String[] getDataForUser(String userid) throws ServerException{
try{
String dbdata = loadFromDB(userid);
String filedata = loadFromFile(userid);
return new String[]{dbdata, filedata};
}catch(SQLException|IOException se){
ServerException e = new ServerException("Unable to load data");
e.setCause(se);
throw e;
}
}

NOTE: Some candidates have reported seeing the usage of ServerException in the exam. It is not known what ServerException does it refer to. There is one java.rmi.ServerException class but it does not have any setCause method. ServerException does have a ServerException(String s, Exception ex) constructor, which can be used to store the actual exception. This exception can then be retrieved using the getCause() method.

Our suggestion is to answer it assuming that it refers to java.rmi.ServerException and that it has a setCause method.

Select 1 option(s):

Q38. What will the following program print when run?

public class ChangeTest {

private int myValue = 0;

public void showOne(int myValue){
myValue = myValue;
}

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

Select 1 option(s):

Q39. A programmer is writing a small component that processes a file line by line. The following is the code :

public class LineByLineProcessor {

public void processLines(String fullFilePath) throws Exception
{
// declare and initialize "handle" here
String str = null;
while( (str = handle.readLine()) != null)
{
System.out.println("Processing line : "+str);
}
handle.close();
}
}

Which of the given options will declare and initialize handle appropriately?

Select 2 option(s):

Q40. Consider the following program:

class Game {
public void play() throws Exception {
System.out.println("Playing...");
}
}

class Soccer extends Game {
public void play(String ball) {
System.out.println("Playing Soccer with "+ball);
}
}

public class TestClass {
public static void main(String[] args) throws Exception {
Game g = new Soccer();
// 1
Soccer s = (Soccer) g;
// 2
}
}

Which of the given options can be inserted at //1 and //2?

Select 2 option(s):

Q41. Given the following class definition:

class A{
protected int i;
A(int i) { this.i = i; }

}
//1 : Insert code here

Which of the following would be a valid class that can be inserted at //1 ?

Select 2 option(s):

Q42. Which of these assignments are valid?

Select 3 option(s):

Q43. Consider the following program...

class Super { }
class Sub extends Super { }
public class TestClass{
public static void main(String[] args){
Super s1 = new Super(); //1
Sub s2 = new Sub(); //2
s1 = (Super) s2; //3
}
}

Which of the following statements are correct?

Select 1 option(s):

Q44. Consider the following code:

public class TestClass{
public void method(Object o){
System.out.println("Object Version");
}
public void method(java.io.FileNotFoundException s){
System.out.println("java.io.FileNotFoundException Version");
}
public void method(java.io.IOException s){
System.out.println("IOException Version");
}
public static void main(String args[]){
TestClass tc = new TestClass();
tc.method(null);
}
}

What would be the output when the above program is compiled and run? (Assume that FileNotFoundException is a subclass of IOException, which in turn is a subclass of Exception)

Select 1 option(s):

Q45. Which of the following command line options can be used to find out all the dependencies of a module while execution?

Note: Although identifying module dependency is not explicitly mentioned in the exam objectives, we have seen questions on the exam that require you to know about this.

Select 1 option(s):

Q46. Which of the following statements are correct regarding synchronization and locks?

Select 1 option(s):

Q47. Given the following code:

public static void main(String[] args) {
LocalDate d1 = LocalDate.now();
d1.plusDays(10);
LocalDate d2 = d1.minusWeeks(1);
d1 = null;
LocalDate d3 = LocalDate.now().plusYears(3).minusMonths(4);
d2.plusWeeks(5);
d1 = d2;
}

How many objects are created/instantiated by the given code?

Select 1 option(s):

Q48. Given:

Integer i1 = 20_00;
String s1 = "2_0";

Identify correct option(s).

Select 2 option(s):

Q49. What will the following code print?

List names = Arrays.asList(1, 2, 3); //1
names.forEach(x->x=x+1); //2
names.forEach(System.out::println); //3

Select 1 option(s):

Q50. Consider the program shown in exhibit and select the right option(s).

public class TestClass
{
static StringBuffer sb1 = new StringBuffer();
static StringBuffer sb2 = new StringBuffer();
public static void main(String[] args)
{
new Thread
(
new Runnable()
{
public void run()
{
synchronized(sb1)
{
sb1.append("X");
synchronized(sb2)
{
sb2.append("Y");
}
}
System.out.println(sb1);
}
}
).start();
new Thread
(
new Runnable()
{
public void run()
{
synchronized(sb2)
{
sb2.append("Y");
synchronized(sb1)
{
sb1.append("X");
}
}
System.out.println(sb2);
}
}
).start();
}
}

Select 1 option(s):