Java SE 17 certification exam 1Z0-829 Practice Test 24

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Welcome to your Java Test 24 - 2024

Name

Email

Phone

Q1. What should be placed in the two blanks so that the following code will compile without errors:

class XXX{
public void m() {
throw new RuntimeException();
}
}
class YYY extends XXX{
public void m() throws Exception{
throw new Exception();
}
}
public class TestClass {
public static void main(String[] args) {
______ obj = new ______();
obj.m();
}
}

You had to select 1 option(s)

XXX and YYY

XXX and XXX

YYY and YYY

YYY and XXX

None of the options will make the code compile.

None

Q2. 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

You had to select 1 option(s)

It will not compile due to line L1.

It will not print anything.

okLabel=OK
cancelLabel=Cancel

okLabel=YES
noLabel=NO

It will throw an exception at run time.

None

Q3. 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?

You had to select 2 option(s)

Q4. Given the following code:

//in WeekDay.java
package days;
public sealed class WeekDay permits Monday {
}

Which of the following is a valid declaration of Monday?

You had to select 1 option(s)

package calendar;
final class Monday extends WeekDay{
}

package days;
final class Monday {
}

package days;
class Monday extends WeekDay{
}

package days;
non-sealed class Monday extends WeekDay{
}

package days;
sealed class Monday extends WeekDay{
}

None

Q5. Given:

//assume appropriate imports
public class Calculator{
public static void main(String[] args) {
double principle = 100;
int interestrate = 5;
double amount = compute(principle, x->x*interestrate);
}

INSERT CODE HERE
}

Which of the following methods can be inserted in the above code so that it will compile and run without any error/exception?

You had to select 2 option(s)

Q6. Given:

Locale locale = new Locale("en", "US");
ResourceBundle rb = ResourceBundle.getBundle("test.MyBundle", locale);

Which of the following are valid lines of code?
(Assume that the ResourceBundle has the values for the given keys.)

You had to select 2 option(s)

String obj = rb.getObject("key1");

Object obj = rb.getObject("key1");

String[] vals = rb.getStringArray("key2");

Object obj = rb.getValue("key3");

Object obj = rb.getObject(1);

Q7. Identify correct statements about the modular system of Java.

You had to select 3 option(s)

A module can allow other modules to access all its types and members of its type through reflection.

By default, a module exhibits strong encapsulation by preventing reflective access to it types.

A module can be used by non-modular code by putting that module on the classpath.

An application can either use module-path or classpath but not both.

A sealed class belonging to a module may list classes belonging to other modules in its permits clause.

Q8. 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();
}
}

You had to select 1 option(s)

It will throw NullPointerException at runtime.

It will throw ArrayIndexOutOfBoundsException at runtime.

It will throw ExceptionInInitializerError at runtime.

It will not compile.

None

Q9. Which of the following are valid declarations inside an interface independent of each other?

You had to select 3 option(s)

default void compute();

public void compute();

static void compute(){
System.out.println("computing...");
}

static void compute();

default static void compute(){
System.out.println("computing...");
};

interface I {
sealed class Inner { }
final class IC extends Inner{ }
}

Q10. 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);
Integer value = wiggler(dataWrapper);
System.out.println(dataWrapper+value);
}
}

You had to select 1 option(s)

5 and 20

6 and 515

6 and 20

6 and 615

It will not compile.

None

Q11. What will be the result of attempting to compile and run the following class?

public class InitTest{
static String s1 = sM1("a");{
s1 = sM1("b");
}
static{
s1 = sM1("c");
}
public static void main(String args[]){
InitTest it = new InitTest();
}
private static String sM1(String s){
System.out.println(s); return s;
}
}

You had to select 1 option(s)

The program will fail to compile.

The program will compile without error and will print a, c and b in that order when run.

The program will compile without error and will print a, b and c in that order when run.

The program will compile without error and will print c, a and b in that order when run.

The program will compile without error and will print b, c and a in that order when run.

None

Q12. Given:

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


Identify correct statements.

You had to select 2 option(s)

An exception will be thrown at runtime if p2 is a symbolic link.

If p2 is a symbolic link, then that link, and not the target of that link, will be replaced .

If p1 is a symbolic link, then the final target of the link is copied to p2.

An exception will be thrown at runtime if either of p1 or p2 is a symbolic link.

Result is OS dependent if either of p1 or p2 is a symbolic link.

Q13. Consider the following code:

class Account{
private String id; private double balance;

ReentrantLock lock = new ReentrantLock();

public void withdraw(double amt){
try{
lock.lock();
if(balance > amt) balance = balance - amt;
}finally{
lock.unlock();
}
}
}

What can be done to make the above code thread safe?

You had to select 1 option(s)

Change new ReentrantLock() to new ReentrantLock(true).

Move the call to lock.lock(); to before the try block.

Declare lock variable as private and final.

Make the lock variable private, final, and static.

Make the lock variable static.

No change is required.

None

Q14. Given the following code:

package com.auto.vehicles;
public interface Drivable{
void drive();
}

and

package com.auto.vehicles.electric;
public class ECar implements Drivable{
private int maxSpeed;
public ECar(){
this(120);
}
public ECar(int maxSpeed){
this.maxSpeed = maxSpeed;
}

@Override
public void drive(){
System.out.println("driving ecar");
}
}


Which statements should be present in the module-info for it to represent a service provider?

You had to select 2 option(s)

requires com.auto.vehicles.Drivable;

requires com.auto.vehicles.electric.ECar;

exports com.auto.vehicles.Drivable;

exports com.auto.vehicles;

provides com.auto.vehicles.Drivable;

provides com.auto.vehicles.Drivable to com.auto.vehicles.electric;

provides com.auto.vehicles.Drivable with com.auto.vehicles.electric.ECar;

provides com.auto.vehicles.electric.ECar;

Q15. Consider the following class...

public class ParamTest {

public static void printSum(double a, double b){
System.out.println("In double "+(a+b));
}

public static void printSum(float a, float b){
System.out.println("In float "+(a+b));
}

public static void main(String[] args) {
printSum(1, 2.0);
printSum(1, 2);
printSum(1.0, 2.0);
}
}

What will be printed?

You had to select 1 option(s)

In float 3.0
In float 3.0
In float 3.0

In double 3.0
In double 3.0
In double 3.0

In double 3.0
In float 3.0
In double 3.0

In float 3.0
In double 3.0
In float 3.0

It will not compile.

None

Q16. What will the following code print?

String s = "blooper";
StringBuilder sb = new StringBuilder(s);
sb.append(s.substring(4)).delete(3, 5);
System.out.println(sb);

You had to select 1 option(s)

blorbloo

bloper

bloerper

blooperper

bloo

None

Q17. Consider the following method:

public void setSQLMode(Connection c, String mode) throws Exception{
Statement stmt = c.createStatement();
String qr = "SET SESSION sql_mode = '"+mode+"';";
stmt.execute(qr);
}

Identify the correct statement about the above code.

You had to select 1 option(s)

mode should enquoted like this:
String qr = "SET SESSION sql_mode = "+stmt.enquoteLiteral(mode)+";";
because enquoting values provided by the calling code prevents SQL injection attacks.

There is no need to enquote mode because identifiers need not be enquoted.

There is no need to enquote mode because the calling code would have enquoted it already.

Enquoting mode would make no difference because it is functionally equivalent to the current statement.

mode should be enquoted using the encodeIdentifier method.

None

Q18. Given:

public class CrazyMath {
public static void main(String[] args) {
int x = 10, y = 20;
int dx, dy;
try{
dx = x % 5;
dy = y/dx;
}catch(ArithmeticException ae){
System.out.println("Caught AE");
dx = 2;
dy = y/dx;
}
x = x/dx;
y = y/dy;
System.out.println(dx+" "+dy);
System.out.println(x+" "+y);

}
}

What is the output?

You had to select 1 option(s)

Caught AE
2 10
5 5

Caught AE
2 10
5 2

2 10
5 2

It will not compile.

None

Q19. Identify correct statement(s) regarding the benefit of using PreparedStatement over Statement.

You had to 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.

Q20. Which of the following method implementations will write a boolean value to the underlying stream?

You had to select 3 option(s)

public void usePrintWriter(PrintWriter pw){
boolean bval = true;
pw.writeBoolean(bval);
}

public void usePrintWriter(PrintWriter pw) throws IOException{
boolean bval = true;
pw.write(bval);
}

public void usePrintWriter(PrintWriter pw) throws IOException{
boolean bval = true;
pw.print(bval);
}

public void usePrintWriter(PrintWriter pw) {
boolean bval = true;
pw.print(bval);
}

public void usePrintWriter(PrintWriter pw) {
boolean bval = true;
pw.println(bval);
}

Q21. 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?

You had to select 1 option(s)

java.lang.Exception

java.lang.ClassNotFoundException

java.io.IOException

java.lang.RuntimeException

None

Q22. What letters, and in what order, will be printed when the following program is compiled and run?

public class FinallyTest{
public static void main(String args[]) throws Exception{
try{
m1();
System.out.println("A");
}
finally{
System.out.println("B");
}
System.out.println("C");
}
public static void m1() throws Exception { throw new Exception(); }
}

You had to select 1 option(s)

It will print C and B, in that order.

It will print A and B, in that order.

It will print B and throw Exception.

It will print A, B and C in that order.

Compile time error.

None

Q23. 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
}

You had to select 4 option(s)

Remove line 3, 6

Remove line 5

Remove line 5, 6

Remove line 7

Remove line 3, 7

Q24. The following code was written for Java 7:

Map<String, List> groupedValues = new HashMap();

public void process(String name, Double value){
List values = groupedValues.get(name);
if(values == null){
values = new ArrayList();
groupedValues.put(name, values);
}
values.add(value);
}

Which of the following implementations correctly makes use of the functional interfaces available in the Java standard library to achieve the same?

You had to select 1 option(s)

None

Q25. Given:

module broker{
exports org.broker.api;
provides org.broker.api.Broker with org.broker.api.MyBroker
}

Which of the following statements are correct?

You had to select 3 option(s)

This is not a valid service definition module because it provides the service instead of defining it.

This is not a valid service provider module because it does not contain appropriate requires clause for service definition.

Other modules can also provide implementations for org.broker.api.Broker service.

Placing the org.broker.api package in a separate module named brokerapi would make it easy to install multiple provider modules.

It is not a good idea to include MyBroker and Broker in the same module because that allows the user of the service to inadvertantly depend on the implementation class.

Q26. Consider the following hierarchy of Exception classes :

java.lang.RuntimeException
+----- IndexOutOfBoundsException
+----ArrayIndexOutOfBoundsException, StringIndexOutOfBoundsException

Which of the following statements are correct for a method that can throw ArrayIndexOutOfBounds as well as StringIndexOutOfBounds Exceptions but does not have try catch blocks to catch the same?

You had to select 3 option(s)

The method calling this method will either have to catch these 2 exceptions or declare them in its throws clause.

It is ok if it declares just throws ArrayIndexOutOfBoundsException

It must declare throws ArrayIndexOutOfBoundsException, StringIndexOutOfBoundsException

It is ok if it declares just throws IndexOutOfBoundsException

It does not need to declare any throws clause.

Q27. A modularized application has been packaged in graphs.jar file with module name as com.xcomp.graphs. The entry point of the application is a class named Main in package com.xcomp.graphs.

Which two options can be used to execute this application?

You had to select 2 option(s)

java --module-path graphs.jar --module com.xcomp.graphs.Main

java --module-path graphs.jar --module com.xcomp.graphs/com.xcomp.graphs.Main

java -classpath graphs.jar --module com.xcomp.graphs/com.xcomp.graphs.Main

java --module-path graphs.jar com.xcomp.graphs.Main

java -classpath graphs.jar com.xcomp.graphs.Main

java --module-path graphs.jar --main-class com.xcomp.graphs.Main

Q28. Identify correct statements about the following code -

interface Drink{
default double getAlcoholPercent(){
return 0.0;
}

static double computeAlcoholPercent(){
return 0.0;
}
}


interface ColdDrink extends Drink{
String getName();
}

class CrazyDrink implements ColdDrink{
// INSERT CODE HERE
}

You had to select 1 option(s)

CrazyDrink must either implement getName or be marked abstract.

CrazyDrink must either implement getName as well as computeAlcoholPercent or be marked abstract.

CrazyDrink must either implement getName as well as getAlcoholPercent or be marked abstract.

CrazyDrink must either implement getName or be marked abstract. Further, computeAlcoholPercent must be removed from Drink.

None

Q29. What will the following code print?

Object v1 = IntStream.rangeClosed(10, 15)
.boxed()
.filter(x->x>12)
.parallel()
.findAny();

Object v2 = IntStream.rangeClosed(10, 15)
.boxed()
.filter(x->x>12)
.sequential()
.findAny();

System.out.println(v1+":"+v2);

(Note: in the options below denote the possible output and not the sign themselves.)

You had to select 1 option(s)

None

Q30. Given the following code :

public class TestClass {

int[][] matrix = new int[2][3];

int[] a = new int[]{1, 2, 3};
int[] b = new int[]{4, 5, 6};

public int compute(int x, int y){
//1 : Insert Line of Code here
}

public void loadMatrix(){
for(int x=0; x<matrix.length; x++){
for(int y=0; y<matrix[x].length; y++){
//2: Insert Line of Code here
}
}
}
}

What can be inserted at //1 and //2?

You had to select 1 option(s)

return a(x)*b(y);
and
matrix(x, y) = compute(x, y);

return a[x]*b[y];
and
matrix[x, y] = compute(x, y);

return a[x]*b[y];
and
matrix[x][y] = compute(x, y);

return a(x)*b(y);
and
matrix(x)(y) = compute(x, y);

return a[x]*b[y];
and
matrix[[x][y]] = compute(x, y);

None

Q31. What will the following code print when run without any arguments ...

public class TestClass {

public static int m1(int i){
return ++i;
}

public static void main(String[] args) {

int k = m1(args.length);
k += 3 + ++k;
System.out.println(k);
}

}

You had to select 1 option(s)

It will throw ArrayIndexOutOfBoundsException.

It will throw NullPointerException.

6

5

7

2

None of these.

None

Q32. What will the following program print?

public class TestClass{
static int someInt = 10;
public static void changeIt(int a){
a = 20;
}
public static void main(String[] args){
changeIt(someInt);
System.out.println(someInt);
}
}

You had to select 1 option(s)

10

20

It will not compile.

It will throw an exception at runtime.

None of the above.

None

Q33. Given:

public class ItemProcessor implements Runnable{ //LINE 1
CyclicBarrier cb;
public ItemProcessor(CyclicBarrier cb){
this.cb = cb;
}
public void run(){
System.out.println("processed");
try {
cb.await();
} catch (Exception ex) {
ex.printStackTrace();
}
}
}

public class Merger implements Runnable{ //LINE 2
public void run(){
System.out.println("Value Merged");
}
}

What should be inserted in the following code such that run method of Merger will be executed only after the thread started at 4 and the main thread have both invoked await?

public static void main(String[] args) throws Exception{
var m = new Merger();

//LINE 3

var ip = new ItemProcessor(cb);
ip.start(); //LINE 4
cb.await();
}

You had to select 1 option(s)

Make ItemProcessor extend Thread instead of implementing Runnable and add CyclicBarrier cb = new CyclicBarrier(1, m); to //LINE 3

Make ItemProcessor extend Thread instead of implementing Runnable and add CyclicBarrier cb = new CyclicBarrier(2, m); to //LINE 3

Make Merger extend Thread instead of implementing Runnable and add CyclicBarrier cb = new CyclicBarrier(1, m); to //LINE 3

Make Merger extend Thread instead of implementing Runnable and add CyclicBarrier cb = new CyclicBarrier(2, m); to //LINE 3

Just add CyclicBarrier cb = new CyclicBarrier(1, m); to //LINE 3

Just add CyclicBarrier cb = new CyclicBarrier(2, m); to //LINE 3

None

Q34. What will the following code print when run?

String[] sa = { "charlie", "bob", "andy", "dave" };
Collections.sort(Arrays.asList(sa), null);
System.out.println(sa[0]);

You had to select 1 option(s)

charlie

andy

dave

It will throw a NullPointerException

It will not compile.

None

Q35. What will the following code print when compiled and run:

public class TestClass {

public static void main(String[] args){
while(var k = 5; k<7){
System.out.println(k++);
}
}
}

You had to select 1 option(s)

5
6

5
6
7

It will keep printing 5.

It will not compile.

It will throw an exception at run time.

None

Q36. Given:

int[][] iaa = { {1, 2}, {3, 4}, { 5, 6} };
long count = Stream.of(iaa).flatMapToInt(IntStream::of)
.map(i->i+1).filter(i->i%2 != 0).peek(System.out::print).count();
System.out.println(count);

What will be the output?

You had to select 1 option(s)

3573

2463

3

2345676

None

Q37. What will be the result of compiling and running the following code:

float foo = 2, bar = 3, baz = 4; //1
float mod1 = foo % baz, mod2 = baz % foo; //2
float val = mod1>mod2? bar : baz; //3
System.out.println(val);

You had to select 1 option(s)

Compilation error at //1

Compilation error at //2

Compilation error at //3

3.0

3.0f

4

4.0

4.0f

None

Q38. Given the following code:

Locale.setDefault(Locale.ITALY);
Locale loc = new Locale.Builder().setLanguage("en").build();
ResourceBundle rb = ResourceBundle.getBundle("mymsgs", loc);
System.out.println(rb.getString("helloMsg"));

and the following properties files:
mymsgs.properties
mymsgs_en_IT.properties
mymsgs_en.properties
mymsgs_IT.properties

Which of the following statements are correct?

You had to select 2 option(s)

If helloMsg is defined in all the four properties files, the value from mymsgs_en.properties will be displayed.

If helloMsg is defined in all the four properties files, the value from mymsgs_en_IT.properties will be displayed.

If helloMsg is defined only in mymsgs_IT.properties, then that value will be displayed.

If helloMsg is not defined in mymsgs_en.properties file but is defned in mymsgs.properties and mymsgs_en_IT.properties, then the value from mymsgs.properties will be displayed.

A java.util.MissingResourceException will be NOT be thrown if helloMsg is defined in any one of the given four properties files.

Q39. Given:

public class Book {
private String title;
private String genre;
public Book(String title, String genre){
this.title = title; this.genre = genre;
}
//accessors not shown
}

and the following code:

List books = List.of(
new Book("Gone with the wind", "Fiction"),
new Book("Bourne Ultimatum", "Thriller"),
new Book("The Client", "Thriller")
);

Reader r = b->{
System.out.println("Reading book "+b.getTitle());
};
books.forEach(x->r.read(x));

What would be a valid definition of Reader for the above code to compile and run without any error or exception?

You had to select 2 option(s)

abstract class Reader{
abstract void read(Book b);
}

abstract class Reader{
void read(Book b);
}

interface Reader{
void read(Book b);
default void unread(Book b){ }
}

interface Reader{
default void read(Book b){ }
void unread(Book b);

interface Reader{
default void read(Book b){ System.out.println("Default read");};
}

Q40. Which of the following code fragments compile without any error?

You had to select 3 option(s)

Q41. Consider the following code:

class Base{
private float f = 1.0f;
void setF(float f1){ this.f = f1; }
}
class Base2 extends Base{
private float f = 2.0f;
//1
}

Which of the following options is/are valid example(s) of overriding?

You had to select 2 option(s)

protected void setF(float f1){ this.f = 2*f1; }

public void setF(double f1){ this.f = (float) ( 2*f1); }

public void setF(float f1){ this.f = 2*f1; }

private is more restrictive than default, so it is NOT valid.

float setF(float f1){ this.f = 2*f1; return f;}

Q42. Given:

Stream strm1 = Stream.of(2, 3, 5, 7, 11, 13, 17, 19); //1
Stream strm2 = strm1.filter(i->{ return i>5 && i<15; }); //2
strm2.forEach(System.out::print); //3


Which of the following options can be used to replace line at //2 and still print the same elements of the stream?

You had to select 1 option(s)

None

Q43. What will be the output?

var ca = new char[]{'a', 'b', 'c', 'd'};
var i = 0;
for(var c : ca){
switch(c){
case 'a' : i++;
case 'b' : ++i;
case 'c'|'d' : i++;
}
}

System.out.println("i = "+i);

You had to select 1 option(s)

Compilation failure

i = 5

i = 6

i = 7

None

Q44. What will the following class print when run?

public class Sample{
public static void main(String[] args) {
String s1 = """
java \
java\
""";
StringBuilder s2 = new StringBuilder("news");
s1.replace("java", "");
s2.append(s1);
System.out.println(s2.indexOf("java"));
}
}

You had to select 1 option(s)

0

-1

4

5

None

Q45. 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()));

You had to 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

Q46. Which of the following can be valid declarations of an integer variable?

You had to select 2 option(s)

private var x = 10;

final int x = 10;

public Int x = 10;

Int x = 10;

static int x = 10;

global int x = 10;

Q47. Which of the following statements are true?

You had to select 2 option(s)

System.out.println(1 + 2 + "3"); will print 33.

System.out.println("1" + 2 + 3); will print 15.

System.out.println(4 + 1.0f); will print 5.0

System.out.println(5/4); will print 1.25

System.out.println('a' + 1 ); will print b.

Q48. Which of the following implementations of a max() method will correctly return the largest value?

You had to select 1 option(s)

None

Q49. Which of the following statements correctly obtains a reference to a Console object?

You had to select 1 option(s)

Console c = Console.getInstance();

Console c = new Console();

Console c = new Console(System.in);

Console c = new Console(new InputStreamReader(System.in));

Console c = System.console();

None

Q50. Given:

public class SimpleLoop {
public static void main(String[] args) {
int i=0, j=10;
while (i<=j) {
i++;
j--;
}
System.out.println(i+" "+j);
}
}

What is the result?

You had to select 1 option(s)

6 4

6 5

6 6

5 3

5 4

5 5

None

Q51. Given:

sealed interface Member permits Student, Person{ //LINE A
String role();
}

record Person(String role) implements Member{ //LINE B
}

record Student(int id, Person person) //LINE C
implements Member //LINE D
{
public String role(){ return person.role(); } //LINE E
}


Which lines will cause compilation issues?

You had to select 1 option(s)

LINE A

LINE B

LINE C

LINE D

LINE E

There is no problem with any of the marked lines but the given code will not compile.

The given code will compile without any problem.

None

Q52. Given:

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

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

public void run()
{
for(int i=0; i<2; i++){
if(lock.tryLock()){
System.out.println(getName()+" got lock. "+getState());
}else{
System.out.println(getName()+" could not get lock. "+getState());
}
}
}
}
public class TestClass
{
public static void main(String args[]) throws Exception
{
T t1 = new T("T1");
t1.start();
T t2 = new T("T2");
t2.start();
Thread.sleep(1000);
}
}


What is a possible output?

You had to select 1 option(s)

T2 could not get lock. RUNNABLE
T1 got lock. RUNNABLE
T2 could not get lock. RUNNABLE
T1 got lock. RUNNABLE

T2 could not get lock. WAITING
T1 got lock. RUNNABLE
T2 could not get lock. WAITING
T1 got lock. RUNNABLE

T2 could not get lock. WAITING
T1 got lock. RUNNABLE
T2 could not get lock. WAITING
T1 could not get lock. WAITING

T2 could not get lock. RUNNABLE
T1 got lock. RUNNABLE
T2 could not get lock. RUNNABLE
T1 could not get lock. RUNNABLE

None

Q53. Consider the following code :

String id = c.readLine("%s", "Enter UserId:"); //1
System.out.println("userid is " + id); //2
String pwd = c.readPassword("%s", "Enter Password :"); //3
System.out.println("password is " + pwd); //4

Assuming that c is a valid reference to java.io.Console and that a user types jack as userid and jj123 as password, what will be the output on the console?

You had to select 1 option(s)

Enter UserId:jack
userid is jack
Enter Password :
password is jj123

Enter UserId:jack
userid is jack
Enter Password :*****
password is jj123

Enter UserId:jack
userid is jack
Enter Password :
password is ****

Enter UserId:jack
userid is jack
Enter Password : password is jj123

It will not compile.

None

Q54. What is the result of executing the following code when the value of i is 5:

switch (i){
default:
case 1:
System.out.println(1);
case 0:
System.out.println(0);
case 2:
System.out.println(2);
break;
case 3:
System.out.println(3);
}

You had to select 1 option(s)

It will print 1 0 2

It will print 1 0 2 3

It will print 1 0

It will print 1

Nothing will be printed.

None

Q55. After which line will the object created at line XXX be eligible for garbage collection?

public Object getObject(Object a) //0
{

Object b = new Object(); //XXX

Object c, d = new Object(); //1
c = b; //2
b = a = null; //3
return c; //4
}

You had to select 1 option(s)

//2

//3

//4

Never in this method.

Cannot be determined.

None

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