Java Standard Test 16 – 2025

Q1. What will the following code print when compiled and run?

class ABCD{
int x = 10;
static int y = 20;
}
class MNOP extends ABCD{
int x = 30;
static int y = 40;
}

public class TestClass {
public static void main(String[] args) {
System.out.println(new MNOP().x+", "+new MNOP().y);
}
}

Select 1 option(s):

Q2. Given:

StringBuilder sb = new StringBuilder("abcdef");
//INSERT CODE HERE
for(int i = 0, k = sb.length(); i<k; i++){
sb.replace(i, i+1, f.apply(sb.charAt(i)));
}
System.out.println(sb);

Which of the following statements can be inserted in the above code?

Select 1 option(s):

Q3. What will the following code print?

Stream ss = Stream.of("a", "b", "c");
String str = ss.collect(Collectors.joining(",", "-", "+"));
System.out.println(str);

Select 1 option(s):

Q4. Given:

package loops;
public class JustLooping {
private int j;
void showJ(){
while(j<=5){
for(int j=1; j <= 5;){
System.out.print(j+" ");
j++;
}
j++;
}
}
public static void main(String[] args) {
new JustLooping().showJ();
}
}

What is the result?

Select 1 option(s):

Q5. What will the following code print?

public class BreakTest{
public static void main(String[] args){
int i = 0, j = 5;
lab1 : for( ; ; i++){
for( ; ; --j) if( i >j ) break lab1;
}
System.out.println(" i = "+i+", j = "+j);
}
}

Select 1 option(s):

Q6. Consider the following code to count objects and save the most recent object:

int i = 0 ;
Object prevObject ;
public void saveObject(List e ){
prevObject = e ;
i++ ;
}

Which of the following calls will work without throwing an exception?

Select 3 option(s):

Q7. What changes can be done to the following code so that it will compile and run without an exception?

SequencedCollection keys = List.of("a"); //1
keys.add("b"); //2

Map map = Map.of(); //3

int i = 0;
for(var key : keys){
map.put(key, "----");
}
System.out.println(keys+" "+map.size());

Select 1 option(s):

Q8. Given the following contents of module-info.java,

module enthu.finance{
exports com.enthu.Reports to com.enthu.tax;
requires transitive enthu.utils;
}

Select correct statements.

Select 1 option(s):

Q9. Given:

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

What can be inserted in the above code?

Select 3 option(s):

Q10. You have been given an array of objects and you need to process this array as follows -

1. Call a method on each object from first to last one by one.
2. Call a method on each object from last to first one by one.
3. Call a method on only those objects at even index (0, 2, 4, 6, etc.)

Which of the following are correct?

Select 1 option(s):

Q11. Which statement(s) about the following code are correct?

interface House{
public default void lockTheGates(){
System.out.println("Locking House");
}
}

interface Office {
public void lockTheGates();
}

class HomeOffice implements House, Office{ //1
}

public class TestClass {

public static void main(String[] args) {
Office off = new HomeOffice(); //2
off.lockTheGates(); //3
House home = (House) off; //4
home.lockTheGates(); //5
}
}

Select 1 option(s):

Q12. Consider the following piece of code, which is run in an environment where the default locale is English - US:

Locale.setDefault(new Locale("fr", "CA")); //Set default to French Canada
Locale l = Locale.getDefault();
ResourceBundle rb = ResourceBundle.getBundle("appmessages", l);
String msg = rb.getString("greetings");
System.out.println(msg);

You have created two resource bundles for appmessages, with the following contents:

#In English US resource bundle file
greetings=Hello

#In French CA resource bundle file
greetings=bonjour

What will be the output?

Select 1 option(s):

Q13. What will the following code fragment print when compiled and run?

Locale myloc = new Locale.Builder().setLanguage("hinglish")
.setRegion("IN").build(); //L1
ResourceBundle msgs = ResourceBundle.getBundle("mymsgs", myloc);

Enumeration en = msgs.getKeys();
while(en.hasMoreElements()){
String key = en.nextElement();
String val = msgs.getString(key);
System.out.println(key+"="+val);
}

Assume that only the following two properties files (contents of the file is shown below the name of the file) are accessible to the code.

1. mymsgs_hinglish_US.properties
okLabel=OK
cancelLabel=Cancel

2. mymsgs_hinglish_UK.properties
okLabel=YES
noLabel=NO

Select 1 option(s):

Q14. Given:

class Item{
private int id;
private String name;
public Item(int id, String name){
this.id = id;
this.name = name;
}
public Integer getId() {
return id;
}

public void setId(int id) {
this.id = id;
}

public String getName() {
return name;
}

public void setName(String name) {
this.name = name;
}
public String toString(){
return name;
}
}


public class Test {
public static void main(String[] args) {
List l = Arrays.asList(
new Item(1, "Screw"),
new Item(2, "Nail"),
new Item(3, "Bolt")
);

l.stream()
//INSERT CODE HERE
.forEach(System.out::print);
}
}

Which of the following options can be inserted in the above code independent of each other, so that the code will print BoltNailScrew?

Select 2 option(s):

Q15. What will happen when the following code is compiled and run?

class AX{
static int[] x = new int[0];
static{
x[0] = 10;
}
public static void main(String[] args){
var ax = new AX();
}
}

Select 1 option(s):

Q16. Which of the following are valid declarations inside an interface independent of each other?

Select 3 option(s):

Q17. What will the following code print when run?

public class TestClass{
public static Integer wiggler(Integer x){
Integer y = x + 10;
x++;
System.out.println(x);
return y;
}

public static void main(String[] args){
Integer dataWrapper = Integer.valueOf("5", 16);
Integer value = wiggler(dataWrapper);
System.out.println(dataWrapper+value);
}
}

Select 1 option(s):

Q18. Consider the following code snippet :

public void readData(String fileName) throws Exception {
try(FileReader fr1 = new FileReader(fileName)){
Connection c = getConnection();
//...other valid code
}
}



Given that the call to getConnection method in the above code throws a ClassNotFoundException and that an IOException is thrown while closing fr1, which exception will be received by the caller of readData() method?

Select 1 option(s):

Q19. Assuming that a valid integer will be passed in the command line as first argument, which statements regarding the following code are correct?

public class TestClass{
public static void main(String args[]){
var x = Integer.parseInt(args[0]);
switch(x){
case x < 5 : System.out.println("BIG"); break;
case x > 5 : System.out.println("SMALL");
default : System.out.println("CORRECT"); break;
}
}
}

Select 1 option(s):

Q20. Given:

List names = Arrays.asList(1, 2, 3);

How many of the following lines will print exactly 6?

1. System.out.println(names.stream().mapToInt(x->x).sum());

2. System.out.println(names.stream().forEach((sum, x)->sum = sum + x));

3. System.out.println(names.stream().reduce(0, (a, b)->a+b));

4. System.out.println(names.stream().collect(
Collectors.mapping(x->x, Collectors.summarizingInt(x->x))).getSum());

5. System.out.println(names.stream().collect(Collectors.summarizingInt(x->x)).getSum());

Select 1 option(s):

Q21. What will the following code print when compiled and run?

class Test{
public static void main(String args[]){
int c = 0;
A: for(var i = 0; i < 2; i++){
B: for(var j = 0; j < 2; j++){
C: for(var k = 0; k < 3; k++){
c++;
if(k>j) break;
}
}
}
System.out.println(c);
}
}

Select 1 option(s):

Q22. Consider the following method which is called with an argument of 7, d, where d is some double value:

Q23. java.util.Locale allows you to do which of the following?

Select 2 option(s):

Q24. Which of the following method(s) of java.util.stream.Stream interface is/are used for reduction?

Select 2 option(s):

Q25. What will the following code print?

Map map1 = new HashMap();
map1.put("a", 1);
map1.put("b", 1);
map1.merge("b", 1, (i1, i2)->i1+i2);
map1.merge("c", 3, (i1, i2)->i1+i2);
System.out.println(map1);

Select 1 option(s):

Q26. What will the following code print if file test1.txt exists but test2.txt doesn't exist?

public class FileCopier {

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


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);
if(Files.isSameFile(p1, p2)){
System.out.println("file copied");
}else{
System.out.println("unable to copy file");
}
}
}

Select 1 option(s):

Q27. 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.

You have modularized myapp without waiting for datalayer and mysql driver to be modularized and the following are the contents of myapp's module-info:

module abc.myapp{
requires datalayer;
}

Assming that com.abc.myapp.Main is the main class of your application that you want to execute, which of the following commands will successfully launch your application?

Select 3 option(s):

Q28. Given the following interface definition, which definitions are valid?

interface I1{
void setValue(String s);
String getValue();
}

Select 2 option(s):

Q29. What will the following code fragment print when compiled and run?

Locale myloc = new Locale.Builder().setLanguage("en").setRegion("UK").build(); //L1
ResourceBundle msgs = ResourceBundle.getBundle("mymsgs", myloc);

Enumeration en = msgs.getKeys();
while(en.hasMoreElements()){
String key = en.nextElement();
String val = msgs.getString(key);
System.out.println(key+" : "+val);
}

Assume that only the following two properties files (contents of the file is shown below the name of the file) are accessible to the code.

1. mymsgs.properties
okLabel=OK
cancelLabel=Cancel

2. mymsgs_en_UK.properties
okLabel=YES
noLabel=NO

Select 1 option(s):

Q30. Which of the following code snippets will print exactly 10?

1. Object t = Integer.valueOf(106);
int k = ((Integer) t).intValue()/10;
System.out.println(k);

2. System.out.println(100/9.9);

3. System.out.println(100/10.0);

4. System.out.println(100/10);

5. System.out.println(3 + 100/10*2-13);

6. int i = 21;
float j = i%9+2;
System.out.println((int)j);

Select 3 option(s):

Q31. What will be the output of the following code?

List letters = new ArrayList();
letters.addAll(List.of("a", "c", "b"));

Collections.sort(letters);
System.out.println(Collections.binarySearch(letters, "c"));
Collections.reverse(letters);
System.out.println(Collections.binarySearch(letters, "c"));

Select 1 option(s):

Q32. Given the following code fragment, which of the following lines would be a part of the output?

outer:
for ( var i = 0 ; i<3 ; i++ ){
for ( var j = 0 ; j<2 ; j++ ){
if ( i == j ){
continue outer;
}
System.out.println( "i=" + i + " , j=" + j );
}
}

Select 2 option(s):

Q33. Consider :

class A {}
class B extends A {}
class C extends B {}

Which of the following boolean expressions correctly identify when the variable o actually refers to an object of class B and not of class C?

Select 2 option(s):

Q34. Which statements regarding the following code are correct?

class Outer
{
private void Outer() { }
protected class Inner
{
}
}

Select 1 option(s):

Q35. Consider the following program...

public class Outer
{
private double d = 10.0;
//put inner class here.
}

Which of the following options can be inserted in Outer class?

Select 3 option(s):

Q36. Given:

public class ValueHolder{
final int value;

*INSERT CODE HERE*

}

Which of the following options can be inserted in the above code independent of each other?

Select 2 option(s):

Q37. Consider the following code:

//Assume appropriate imports
class Person{
String name;
String dob;
public Person(String name, String dob){
this.name = name; this.dob = dob;
}
}
public class SortTest {
public static void main(String[] args) {
ArrayList al = new ArrayList();
al.add(new Person("Paul", "01012000"));
al.add(new Person("Peter", "01011990"));
al.add(new Person("Patrick", "01012002"));

//INSERT CODE HERE

for(Person a : al) System.out.println(a.name+" "+ a.dob);
}
}


What can be inserted in the code so that it will sort the collection of Persons by Person's dob attribute?

Select 1 option(s):

Q38. Consider these two interfaces:

interface I1
{
void m1() throws java.io.IOException;
}
interface I2
{
void m1() throws java.sql.SQLException;
}

What methods have to be implemented by a class that says it implements I1 and I2 ?
(Assume that IOException and SQLException do not have a parent-child relationship.)

Select 1 option(s):

Q39. Given:

public class TestClass{
public static boolean getBool(){
return true;
}
public static String getString(){
return "true";
}
public static void main(String args[]){
switch( getBool() ){
case true -> System.out.println("true");
default -> System.out.println("none");
}
}
}

What changes can be done so that it will print only true?

Select 1 option(s):

Q40. Your are modularizing your java application but it depends on commons-dbcp-0.9.jar, which is not modularized. So, you have decided to put this jar on the module-path. What module name will be given to the automatic module created for this jar?

Select 1 option(s):

Q41. Which statements, when inserted in the code below, will cause an exception at run time?

class B {}
class B1 extends B {}
class B2 extends B {}
public class ExtendsTest{
public static void main(String args[]){
B b = new B();
B1 b1 = new B1();
B2 b2 = new B2();
// insert statement here
}
}

Select 1 option(s):

Q42. Consider the following code:

public class Logger{
private StringBuilder sb = new StringBuilder();

public void logMsg(String location, String message){
sb.append(location);
sb.append("-");
sb.append(message);
}

public void dumpLog(){
System.out.println(sb.toString());
//Empty the contents of sb here
}

}

Which of the following options will empty the contents of the StringBuilder referred to by variable sb in method dumpLog()?

Select 1 option(s):

Q43. What will the following code print when compiled and run?

abstract class Calculator{
abstract void calculate();
public static void main(String[] args){
System.out.println("calculating");
Calculator x = null;
x.calculate();
}
}

Select 1 option(s):

Q44. What will be the output when the following program is run?

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

static void doTest() throws MyException{
int[] array = new int[10];
array[10] = 1000;
doAnotherTest();
}

static void doAnotherTest() throws MyException{
throw new MyException("Exception from doAnotherTest");
}
}
class MyException extends Exception {
public MyException(String msg){
super(msg);
}
}

(Assume that there is no error in the line numbers given in the options.)

Select 1 option(s):

Q45. Identify correct statements about the module system of Java.

Select 2 option(s):

Q46. Identify examples of unboxing.

Select 3 option(s):