30 Minute Java Test

A 30-minute Java test is a timed assessment designed to evaluate a candidate's proficiency in Java programming within a short period. These tests typically cover fundamental concepts such as object-oriented programming, exception handling, multithreading, and data structures. They are commonly used by employers, educators, and certification programs to gauge a person's coding skills and problem-solving abilities under time constraints.

Whether you're preparing for a job interview, a certification exam, or simply testing your Java knowledge, a 30-minute Java test can help identify strengths and areas for improvement. Many online platforms offer free practice tests, allowing learners to refine their skills before taking official exams.

Welcome to your 30 Minutes Java Test

Name

Phone

Question: Consider the following class:

public class PortConnector{

public PortConnector(int port) throws IOException{

...lot of valid code.

}

...other valid code.

}

You want to write another class CleanConnector that extends from PortConnector. Which of the following statements should hold true for CleanConnector class?

Select 1 option(s)

It is not possible to define CleanConnector that does not throw IOException at instantiation.

PortConnector class itself is not valid because you cannot throw any exception from a constructor.

CleanConnector's constructor cannot throw any exception other than IOException.

CleanConnector's constructor cannot throw any exception other than subclass of IOException.

CleanConnector's constructor cannot throw any exception other than superclass of IOException.

None of these.

None

Question: Consider the following code:

import java.io.*;

public class Test

{

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

{

var fw = new FileWriter("text.txt");

// fw.write("hello"); //1

fw.close();

}

Which of the following statements are correct?

Select 1 option(s)

It will throw an exception if text.txt does not exist.

It will create text.txt file in the filesystem if it does not exist.

It will not throw an exception if text.txt does not exist and it will not create a file either because nothing is being written to the file.

It will throw an exception if //1 is uncommented and if text.txt does not exist.

It will throw an exception if text.txt already exists.

None

Questino: 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)

{a=1, b=2, c=3}

{a=1, b=1, c=3}

{a=1, b=2}

A NullPointerException will be thrown at run time.

None

Question: What will the following code print?

String examName = "OCP Java 11";

String uniqueExamName = new String(examName);

String internedExamName = uniqueExamName.intern();

System.out.println(

(examName==uniqueExamName)+" "+

(examName == internedExamName)+" "+

(uniqueExamName == internedExamName) );

Select 1 option(s)

false true true

false false false

true true true

true true false

false true false

true false true

None

Question: How will you initialize a DateTimeFormatter object so that the following code will print the number of the month (i.e. 02 for Feb, 12 for Dec, and so on) and a two digit calendar year of any given date?

System.out.println(dtf.format(LocalDate.now()));

Select 1 option(s)

DateTimeFormatter sdf = DateTimeFormatter.ofPattern("mm/yy");

DateTimeFormatter sdf = DateTimeFormatter.ofPattern("MM/yy");

DateTimeFormatter sdf = DateTimeFormatter.ofPattern("mm/YY");

DateTimeFormatter sdf = DateTimeFormatter.ofPattern("MM/YY");

None

Question: 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)

Which ever module requires enthu.finance, must require enthu.utils as well.

The enthu.finance module requires all modules required by enthu.utils.

The enthu.finance module requires only the those modules that are required by enthu.utils but does not require enthu.utils itself.

Only class from the com.enthu.tax module are allowed to read classes in the com.enthu.Reports package.

The enthu.finance module exports only the those classes that are used by the com.enthu.tax module.

This is an invalid module definition because exports-to and requires-transitive clauses cannot be used together.

None

Question: Which of the following are benefits of ArrayList over an array?

Select 1 option(s)

You do not have to worry about the size of the ArrayList while appending elements.

It consumes less memory space.

You do not have to worry about thread safety.

It allows you to write type safe code.

None

Question: Identify correct statements about Java platform module system.

Select 2 option(s)

A module is a set of packages that make sense being grouped together and is designed for reuse.

The module system ensures that code that is internal to a platform implementation is not accessible from outside the implementation.

The module system uses only two phases - compile time and run time - for building an application.

All classes in a module are concealed and cannot be accessed by code from other modules. Only interfaces are visible outside the package.

Question: Consider the following code snippet:

XXXX m ;

//other code that initializes m

switch( m ){

case 32 : System.out.println("32"); break;

case 64 : System.out.println("64"); break;

case 128 : System.out.println("128"); break;

}

What type can 'm' be of so that the above code compiles and runs as expected ?

Answered Incorrectly

Select 3 option(s)

int m;

long m;

char m;

byte m;

short m;

var m;

10.

Question: Consider the following code appearing in a module-info.java.

module com.amazing.movies{ //1

exports com.amazing.movies; //2

exports com.amazing.movies to com.amazing.rentals;//3

requires transitive com.amazing.customer;//4

}

Identify correct statements.

Select 1 option(s)

This is a valid module info.

This is an invalid module info because the name of the module and the name of a package that it exports are the same.

This is an invalid module info because line marked //3 uses incorrect syntax.

This is an invalid module info because lines marked //2 and //3 are in conflict.

This is an invalid module info because lines marked //3 and //4 use incorrect syntax.

None

11.

Question: What, if anything, is wrong with the following code?

interface T1{

}

interface T2{

int VALUE = 10;

void m1();

}

interface T3 extends T1, T2{

public void m1();

public void m1(int x);

}

Select 1 option(s)

T3 cannot implement both T1 and T2 because it leads to ambiguity.

There is nothing wrong with the code.

The code will work fine only if VALUE is removed from T2 interface.

The code will work fine only if m1() is removed from either T2 and T3.

None of the above.

None

12.

Question: 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

13.

Question: Which of the following statements are correct regarding the module system of Java.

Select 2 option(s)

Although not recommended, it is possible to customize what packages a module exports from the command line.

An advantage of java modules functionality is that users of a module cannot alter the list of exported packages of that module.

If a module does not export a package, there is no way to export that package to all other modules from the command line.

If a module wants to read another module but only temporarily, it can request such access using command line options.

A module can request access to another module temporarily using command line options but only if the target package already exports that package in its module-info.

14.

Question: Given:

public class FunWithArgs {

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

System.out.println(args[0][1]);

}

public static void main(String[] args) {

var fwa = new FunWithArgs();

String[][] newargs = {args};

fwa.main(newargs);

}

The above program is compiled with the command line:

javac FunWithArgs.java

and then run with:

java FunWithArgs a b c

What will be the output?

Select 1 option(s)

It will not compile.

It will throw ArrayIndexOutOfBoundsException at run time.

t will print b.

It will print null.

None

15.

Question: Identify correct statements.

Select 3 option(s)

Since checking privileges is expensive, results of privileged operations should be cached so that they can be returned on demand later.

If an operation requires a specific permission, then every frame on the stack must have that permission for the call to succeed.

Callback methods are generally invoked from the system with full permissions.

Newly constructed threads are executed with the access control context that was present when the Thread object was constructed.

16.

Question: Identify correct statements about the modular JDK.

Select 3 option(s)

Modular JDK allows modular as well as non-modular applications to co-exist.

Modular JDK facilitates aggressive API deprecation.

With modular JDK it is possible to assemble and optimize a set of modules and their dependencies into a custom runtime image.

Modular JDK allows a module to export a package only to a specific module as well.

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

17.

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

Select 2 option(s)

PreparedStatement offers better performance.

PreparedStatement offers better performance when the same query is to be run multiple times with different parameter values.

PreparedStatement supports multiple transactions.

PreparedStatement allows several additional SQL types such as BLOB and CLOB.

18.

Question: What will be the result of attempting to run the following program?

public class StringArrayTest{

public static void main(String args[]){

String[][][] arr = {{ { "a", "b" , "c"}, { "d", "e", null } },

{ {"x"}, null },{{"y"}},{ { "z","p"}, {} }

};

System.out.println(arr[0][1][2]);

}

Select 1 option(s)

It will throw NullPointerBoundsException.

It will throw ArrayIndexOutOfBoundsException.

It will print null.

It will run without any error but will print nothing.

None of the above.

None

19.

Question: What will the following code print?

void crazyLoop(){

var c = 0;

JACK: while (c < 8){

JILL: System.out.println(c);

if (c > 3) break JILL; else c++;

}

Select 1 option(s)

It will not compile.

It will throw an exception at runtime.

It will print numbers from 0 to 8.

It will print numbers from 0 to 3.

It will print numbers from 0 to 4.

None

20.

Question: Given:

Connection con = DriverManager.getConnection(dbURL);

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?

Select 1 option(s)

stmt.commit();

con.commit();

stmt.commit(true);

No code is necessary.

None

21.

Question: What is the result of executing the following fragment of code:

var b1 = false;

var b2 = false;

if (b2 = b1 == false){

System.out.println("true");

} else{

System.out.println("false");

}

Select 1 option(s)

Compile time error.

It will print true.

It will print false.

Runtime error.

It will print nothing.

None

22.

Question: Identify correct statements about the following method that is used internally by a class:

private byte[] allocateNew(int additional, byte[] existing){

byte[] newarray = new byte[existing.length+additional];

System.arraycopy(existing, 0, newarray, 0, existing.length);

return newarray;

}

Select 2 option(s)

This code is susceptible to confidential data theft.

This code is prone to injection attacks.

This code correctly implements Accessibility and Extensibility guidelines.

This code is prone to one category of denial of service attacks.

This code does not violate any secure coding guideline.

23.

Question: While working on a code cleanup project for a library that you make available to your users, you observe the following customer visible method:

public void setApprovedUsers(final List userids) {

return AccessController.doPrivileged(

(PrivilegedAction)() -> {

this.userManager.setApprovedUsers(userids);

return null;

}

);

}

What change should you make to this method so that it satisfies the requirements for a customer visible method?

Select 1 option(s)

Add userids = new ArrayList(userids); before doPrivileged.

Remove the doPrivileged block.

Replace this.userManager.setApprovedUsers(userids); with this.userManager.setApprovedUsers(List.copyOf(userids));

Enclose the doPrivileged block in a try catch.

None

24.

Question: 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)

Code for class HomeOffice will cause compilation to fail at //1.

Lines at //3 and //5 will cause compilation to fail.

Line at //4 will cause compilation to fail.

There will no compilation error. The code will print Locking House twice.

None

25.

Question: Consider the following interface definition:

interface Bozo{

int type = 0;

public void jump();

}

Now consider the following class:

public class Type1Bozo implements Bozo{

public Type1Bozo(){

type = 1;

}

public void jump(){

System.out.println("jumping..."+type);

}

public static void main(String[] args){

Bozo b = new Type1Bozo();

b.jump();

}

What will the program print when compiled and run?

Select 1 option(s)

jumping...0

jumping...1

This program will not compile.

It will throw an exception at runtime.

None

26.

Question: 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)

module-info.java will be copied over to out\foo.bar folder.

module-info.java will be moved to out\foo.bar folder.

An exception will be thrown.

module-info.java will be moved to out with the name foo.bar.

None

27.

Question: Assume that a method named 'method1' contains code which may raise a non-runtime (checked) Exception.

What is/are the possible way(s) to declare this method so that it indicates that it expects the caller to handle that exception?

Select 2 option(s)

public void method1() throws Throwable

public void method1() throw Exception

public void method1() throw new Exception

public void method1() throws Exception

public void method1()

28.

Question: Consider the following code:

class A {
public void doA(int k) throws Exception { // 0
for(int i=0; i< 10; i++) {
if(i == k)
throw new Exception("Index of k is "+i); // 1
}
}
public void doB(boolean f) { // 2
if(f) {
doA(15); // 3
}
else return;
}
public static void main(String[] args) { // 4
A a = new A();
a.doB(args.length>0); // 5
}
}

Which of the following statements are correct?

Select 1 option(s)

This will compile and run without any errors or exception.

This will compile if throws Exception is added at line //2.

This will compile if throws Exception is added at line //4.

This will compile if throws Exception is added at line //2 as well as //4.

This will compile if line marked // 1 is enclosed in a try - catch block.

None

29.

Question: Given the following interface:

interface InputStreamHandler {
public long read(InputStream in) throws IOException;
}

and the following code in some other class:

public long getTotal(String file) throws IOException{
long sum = readFileBuffered(file,
(InputStream in) -> {
long current = 0;
for (;;) {
int b = in.read();
if (b == -1) {
return current;
}
current += b;
}
});
return sum;
}

public long readFileBuffered(String file, InputStreamHandler handler)
throws IOException {
try (final InputStream in = Files.newInputStream(Paths.get(file))) {
return handler.read(new BufferedInputStream(in));
}
}

Identify correct statements.

Select 1 option(s)

This code prevents one category of denial of service attacks.

This code implements secure coding guidelines for mutability.

This code implements secure coding guidelines for Accessibility and Extensibility.

This code implements secure coding guidelines Data Integrity.

None

30.

Question: Identify valid statements.

Select 3 option(s)

Locale myLocale = System.getDefaultLocale();

Locale myLocale = Locale.getDefaultLocale();

Locale myLocale = Locale.getDefault();

Locale myLocale = Locale.US;

Locale myLocale = Locale.getInstance();

Locale myLocale = new Locale("ru", "RU");

31.

Question: What, if anything, is wrong with the following code?

void test(int x){
switch(x){
case 1:
case 2:
case 0:
default :
case 4:
case 'a'|'b': System.out.println('c');
}
}

Select 1 option(s)

Data Type of 'x' is not valid to be used as an expression for the switch clause.

The case label 0 must precede case label 1.

Each case section must end with a break keyword.

The default label must be the last label in the switch statement.

There is nothing wrong with the code.

The last case statement is invalid.

None

32.

Question: You are the maintainer of a library packaged as bondanalytics.jar, which is used by several groups in your company. It has the following two packages that are used by other applications:

com.abc.bonds
com.abc.bonds.analytics

You want to modularize this jar but some groups have not yet modularized their applications. How will such groups use the modularized jar?

Select 1 option(s)

They cannot. Two versions of the jar will need to be maintained - one modularized and one old.

They can remove module-info.class from your modular jar and use the jar just as before.

They can use the new modular jar just like they use the old jar earlier without any changes.

They would have to use the --module-path option to use the new modular jar.

None

33.

Question: Given the following code (assume appropriate imports):

public class IOTest {
public static void main(String[] args) {
var myfile = Paths.get("test.txt");
try(var bfr = Files.newBufferedReader(myfile, Charset.forName("US-ASCII") )){
String line = null;
while( (line = bfr.readLine()) != null){
System.out.println(line);
}
}catch(Exception e){
System.out.println(e);
}
}
}

What will be printed when this code is run if test.txt doesn't exist?

Select 1 option(s)

java.io.FileNotFoundException: test.txt

java.nio.file.FileNotFoundException: test.txt

java.nio.file.NoSuchFileException: test.txt

java.nio.file.InvalidPathException : test.txt

None

34.

Question: Following is a program to capture words from command line and create two collections. One that keeps only unique words and one that keeps all the words in the order they were entered. What should replace AAA and BBB?

static Collection unique = new AAA();
static Collection ordered = new BBB();
public static void main(String args[]) throws Exception
{
BufferedReader bfr = new BufferedReader( new InputStreamReader( System.in ) );
String s = bfr.readLine();
while(s != null && s.length() >0)
{
unique.add(s);
ordered.add(s);
s = bfr.readLine();
}
System.out.println(unique);
System.out.println(ordered);
}

Select 2 option(s)

Set, List

LinkedList, HashSet

HashSet, LinkedList

HashSet, ArrayList

Vector, TreeSet

35.

Question: 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)

1, 3

3, 1

An exception will be thrown at run time.

Order of elements in the Deque cannot be predicted.

It will not compile.

None

36.

Question: 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)

[324, 325, 326, 327, 328] [326, 327, 329]

[324, 325, 326, 327, 329] [326, 327, 329]

[324, 325, 326, 327, 328] [326, 327]

It will throw an exception at runtime.

It will not compile.

None

37.

Question: 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)

sb.delete(0, sb.length());

sb.clear();

sb.empty();

sb.removeAll();

sb.deleteAll();

None

38.

Question: What will the following program print?

public class TestClass{
public static void main(String[] args){
Object obj1 = new Object();
Object obj2 = obj1;
if( obj1.equals(obj2) ) System.out.println("true");
else System.out.println("false");
}
}

Select 1 option(s)

true

false

It will not compile.

It will compile but throw an exception at run time.

None of the above.

None

39.

Question: 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)

-a+,-b+,-c+

a,-+b,-+c

-a,b,c+

It will throw an exception at run time.

None

40.

Question: 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.

41.

Question: What can be done to get the following code to compile and run? (Assume that the options are independent of each other.)

public float parseFloat( String s ){
float f = 0.0f; // 1
try{
f = Float.valueOf( s ).floatValue(); // 2
return f ; // 3
}
catch(NumberFormatException nfe){
f = Float.NaN ; // 4
return f; // 5
}
finally {
return f; // 6
}
return f ; // 7
}

Select 4 option(s)

Remove line 3, 6

Remove line 5

Remove line 5, 6

Remove line 7

Remove line 3, 7

42.

Question: As a part of an application, you have serialized and stored some objects of a class in the database. At another place in the same application, you deserialize those objects.

After a few months you determine that you need to add one new String field in the class.

Which of the following statements are correct regarding the above described situation?

Select 1 option(s)

The objects serialized earlier cannot be deserialized to the updated class objects.

Objects serialized earlier can be deserialized to the updated class objects by adding a new serialVersionUID field with a value of 0 to the updated class.

No special change is necessary in the updated class. Objects serialized earlier will be deserialized to the updated class objects but the newly added field will be null.

Old serialized objects can be deserialized only if the original class had explicitly defined a serialVersionUID field and if the updated class maintains the same value for that field.

It is possible to deserialize the older objects into the update class objects even if the original class did not explicitly define the serialVersionUID field.

None

43.

Question: Consider the following method code:

public static void copy(String records1, String records2) {
try (
InputStream is = new FileInputStream(records1);
OutputStream os = new FileOutputStream(records2); ) {

byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = is.read(buffer)) != -1) {
os.write(buffer, 0, bytesRead);
System.out.println("Read and written bytes " + bytesRead);
}
}
catch ( *INSERT CODE HERE* e ) { //LINE 100
}

}

What can be inserted at //LINE 100 to make the method compile?

Select 1 option(s)

Exception|IOException

FileNotFoundException|SecurityException|IllegalArgumentException

FileNotFoundException|IOException

IOException|RuntimeException

IOException|NoSuchFileException

None

44.

Question: What will be the result of attempting to compile and run the following code?

public class PromotionTest{
public static void main(String args[]){
int i = 5;
float f = 5.5f;
double d = 3.8;
char c = 'a';
if (i == f) c++;
if (((int) (f + d)) == ((int) f + (int) d)) c += 2;
System.out.println(c);
}
}

Select 1 option(s)

The code will fail to compile.

It will print d.

It will print c.

It will print b.

It will print a.

None

45.

Question: Given the following complete contents of TestClass.java:

import java.util.ArrayList;
import java.util.Collections;

class Address implements Comparable

{
String street;
String zip;
public Address(String street, String zip){
this.street = street; this.zip = zip;
}
public int compareTo(Address o) {
int x = this.zip.compareTo(o.zip);
return x == 0? this.street.compareTo(o.street) : x;
}
}
public class TestClass {
public static void main(String[] args) {
ArrayList

al = new ArrayList();
al.add(new Address("dupont dr", "28217"));
al.add(new Address("sharview cir", "28217"));
al.add(new Address("yorkmont ridge ln", "11223"));
Collections.sort(al);
for(Address a : al) System.out.println(a.street+" "+ a.zip);
}
}

What will be printed?

Select 1 option(s)

yorkmont ridge ln 11223
dupont dr 28217
sharview cir 28217

sharview cir 28217
yorkmont ridge ln 11223
dupont dr 28217

sharview cir 28217
dupont dr 28217
yorkmont ridge ln 11223

The order of output messages cannot be determined.

It will throw an exception at run time.

It will not compile.

None

46.

Question: Given:

interface I { }

class A implements I{
public String toString(){ return "in a"; }
}

class B extends A{
public String toString(){ return "in b"; }
}

public class TestClass {

public static void main(String[] args) {
B b = new B();
A a = b;
I i = a;

System.out.println(i);
System.out.println((B)a);
System.out.println(b);

}
}

What will be printed when the above code is compiled and run?

Select 1 option(s)

in i
in a
in b

I
A
in b

in a
in a
in b

in a
in b
in b

in b
in b
in b

None

47.

Question: Consider the following code.

LocalDate d = LocalDate.now();
Locale loc = new Locale("fr", "FR");
// 1 insert code here.

What should be inserted at //1 above so that it will print the date in French format?

Select 1 option(s)

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy", loc);
System.out.println(df.format(d));

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
System.out.println(df.format(d, loc));

DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
df.setLocale(loc);
System.out.println(df.format(d));

d.setLocale(loc);
DateTimeFormatter df = DateTimeFormatter.ofPattern("dd MMM yyyy");
System.out.println(df.format(d));

None

48.

Question: Which of the following statements will correctly create and initialize an array of Strings to non null elements?

Select 4 option(s)

String[] sA = new String[1] { "aaa"};

String[] sA = new String[] { "aaa"};

var[] sA = new String[1] ; sA[0] = "aaa";

String[] sA = {new String( "aaa")};

String[] sA = { "aaa"};

String[] sA = new String[1] ; sA[0] = "aaa";

49.

Question: Which of the following are valid JDBC URLs?

Select 1 option(s)

jdbc:derby://localhost:1527/sample

//jdbc://derby://localhost:1527/sample

http://jdbc:mysql:localhost/sample

https://mysql.com:3306/sample

None

50.

Question: 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?

Select 1 option(s)

appmessages_es_ES.properties is not present in PATH.

appmessages_es_ES.properties is not present in CLASSPATH.

appmessages_es_ES.properties is not specified using -D option on command line.

appmessages_es_ES.properties is not present in JAVA_HOME.

None

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