Java Test 1 - 2024

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

You had to select 3 option(s)

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

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

You had to select 1 option(s)

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

You had to select 2 option(s)

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?

You had to select 2 option(s)

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?

You had to select 1 option(s)

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

You had to select 1 option(s)

Q7. Given:

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

Identify correct statement(s).

You had to select 1 option(s)

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]);
}
}

You had to select 1 option(s)

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));

You had to select 1 option(s)

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; } }

You had to select 1 option(s)

Q11. Given:

int a = 1 + 2 + 3 * 4;
int b = 2 * 3 + 4;

int total = a + b;

What will be the value of total?

You had to select 1 option(s)

Q12. Given:

public class TestClass
{
public static void main(String[] args) {
String s = "/usr/home1/test.txt";
String d = "/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?

You had to select 1 option(s)

Q13. Consider the following code:

Locale.setDefault(new Locale("es", "ES"));
ResourceBundle rb = ResourceBundle.getBundle("appmessages");
String msg = rb.getString("greetings");
System.out.println(msg);

You have created a valid resource bundle file named appmessages_es_ES.properties that contains 'greetings' property. However, when you run the above code, you get an exception saying,
"java.util.MissingResourceException:
Can't find bundle for base name appmessages, locale es_ES".

What could be the reason?

You had to select 1 option(s)

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?

You had to select 1 option(s)

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");
}
}
}

You had to select 2 option(s)

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?

You had to select 1 option(s)

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());
}

You had to select 1 option(s)

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.

You had to select 1 option(s)

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?

You had to select 2 option(s)

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.

You had to select 2 option(s)

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?

You had to select 1 option(s)

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

You had to select 1 option(s)

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?

You had to select 1 option(s)

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?

You had to select 1 option(s)

Q25. Identify correct statement(s) regarding the benefit of using PreparedStatement over Statement.

You had to select 1 option(s)

Q26. 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.

You had to select 1 option(s)

Q27. Which of the following lambda expressions can be used to invoke a method that accepts a java.util.function.Predicate as an argument?

You had to select 2 option(s)

Q28. What is wrong with the following code written in a single file named TestClass.java?

class SomeThrowable extends Throwable { }
class MyThrowable extends SomeThrowable { }
public class TestClass{
public static void main(String args[]) throws SomeThrowable{
try{
m1();
}catch(SomeThrowable e){
throw e;
}finally{
System.out.println("Done");
}
}
public static void m1() throws MyThrowable{
throw new MyThrowable();
}
}

You had to select 1 option(s)

Q29. Consider the following code snippet:

void m1() throws Exception{
try{
// line1
}
catch (IOException e){
throw new SQLException();
}
catch(SQLException e){
throw new InstantiationException();
}
finally{
throw new CloneNotSupportedException();
// CloneNotSupportedException is a checked exception.
}
}

Which of the following statements are true?

You had to select 2 option(s)

Q30. Given:

Connection con = DriverManager.getConnection(dbURL);
con.setAutoCommit(false);
String updateString =
"update SALES " +
"set T_AMOUNT = 100 where T_NAME = 'BOB'";
Statement stmt = con.createStatement();
stmt.executeUpdate(updateString);
//INSERT CODE HERE

What statement should be added to the above code so that the update is committed to the database?

You had to select 1 option(s)

Q31. 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?

You had to select 1 option(s)

Q32. Which of the following are benefits of ArrayList over an array?

You had to select 1 option(s)

Q33. Consider the following classes:

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

You had to select 2 option(s)

Q34. Given:

var sList = new CopyOnWriteArrayList();

Which of the following statements are correct?

You had to select 1 option(s)

Q35. 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());
}
}

You had to select 1 option(s)

Q36. You want to use a third party JDBC driver for a database. Which of the following actions must you take to retrieve a Connection using that driver in your JDBC program?

You had to select 2 option(s)

Q37. Given:

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

What can be inserted in the above code?

You had to select 3 option(s)

Q38. 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());
}
}

You had to select 1 option(s)

Q39. Given:

class Base{
public Collection getCollection(T t, Integer n)
{
return new ArrayList();
}
}

class Derived extends Base{

//public List getCollection(T t, Integer m){ return new ArrayList(); }; //1

//public Stream getCollection(T t, Integer m){ return new ArrayList(); }; //2

//public void getCollection(T t, Integer m){ return new ArrayList(); }; //3

//public List getCollection(String t, Integer m){ return new ArrayList(); };//4
}


Identify correct statements about the methods defined in Derived assuming they are uncommented one at a time individually.

You had to select 1 option(s)

Q40. Which of these statements are true?

You had to select 2 option(s)

Q41. 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?

You had to select 1 option(s)

Q42. Which of the following statements are correct about --jdk-internals option of jdeps tool when run on a jar file or a class file?

You had to select 2 option(s)

Q43. 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);

You had to select 1 option(s)

Q44. What will the following program print?

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

You had to select 1 option(s)

Q45. What will be printed when the following code is compiled and run?

public class LoadTest{

public static void main(String[] args) throws Exception {
LoadTest t = new LoadTest();
int i = t.getLoad();
double d = t.getLoad();
System.out.println( i + d );
}

public int getLoad() {
return 1;
}

public double getLoad(){
return 3.0;
}

}

You had to select 1 option(s)

Q46. 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?

You had to select 1 option(s)

Q47. 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.

You had to select 3 option(s)

Q48. 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);

You had to select 1 option(s)

Q49. Identify correct statements about the modular JDK.

You had to select 3 option(s)

Q50. Given the following code fragment:

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

What is the result?

You had to select 1 option(s)

Q51.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 );
}
}

You had to select 1 option(s)

Q52. Given:

List ls = Arrays.asList(10, 47, 33, 23);

int max = //INSERT code HERE
System.out.println(max); //1


Which of the following options can be inserted above so that it will print the largest number in the input stream?

You had to select 1 option(s)

Q53. 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);

You had to select 1 option(s)

Q54. 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?

You had to select 3 option(s)

Q55. Given:

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

You had to select 1 option(s)