Standard Unique Test 1

Q1. Which of the following are valid module definitions?

Select 1 option(s):

Q2. What will be the output of the following program:

public class TestClass{
public static void main(String args[]){
try{
m1();
}catch(IndexOutOfBoundsException e){
System.out.println("1");
throw new NullPointerException();
}catch(NullPointerException e){
System.out.println("2");
return;
}catch (Exception e) {
System.out.println("3");
}finally{
System.out.println("4");
}
System.out.println("END");
}

static void m1(){
System.out.println("m1 Starts");
throw new IndexOutOfBoundsException( "Big Bang " );
}
}

Select 3 option(s):

Q3. What will be the output of the following code?

List numbers = new ArrayList();
numbers.addAll(List.of(-2, -1, 19, 2, 111) );
Comparator cmp = (n1, n2)->n1.toString().compareTo(n2.toString());
Collections.sort(numbers, cmp);
System.out.println(
Collections.binarySearch(numbers, 111)+" "+
Collections.binarySearch(numbers, 19, cmp) );

Select 1 option(s):

Q4. Replace XXX with a declaration such that the following code will compile without any error or warning.

public void m1(XXX list)
{
Number n = list.get(0);
}

Select 1 option(s):

Q5. Consider the following code...

class MyException extends Exception {}

public class TestClass{
public void myMethod() throws XXXX{
throw new MyException();
}
}

What can replace XXXX?

Select 3 option(s):

Q6. What will the following code print when compiled and run?

import java.time.*;
import java.time.format.*;
public class DateTest{
public static void main(String[] args){ //1
LocalDateTime greatDay = LocalDateTime.parse("2022-01-01");//2
String greatDayStr = greatDay.format(DateTimeFormatter.ISO_DATE_TIME); //3
System.out.println(greatDayStr);//4
}
}

Select 1 option(s):

Q7. Given:

class Booby{
}
class Dooby extends Booby{
}
class Tooby extends Dooby{
}

public class TestClass {
Booby b = new Booby();
Tooby t = new Tooby();
public void do1(List dataList){
//1 INSERT CODE HERE
}
public void do2(List dataList){
//2 INSERT CODE HERE
}
}
and the following four statements:

1. b = dataList.get(0);
2. t = dataList.get(0);
3. dataList.add(b);
4. dataList.add(t);

What can be inserted in the above code?

Select 1 option(s):

Q8. Which of the following code fragments correctly loads a service provider that implements api.BloggerService?

Select 1 option(s):

Q9. Which statements 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 void lockTheGates(){
System.out.println("Locking HomeOffice");
}
}

public class TestClass {

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

Select 1 option(s):

Q10. What will the following code print when compiled and run?

interface Pow{
static void wow(){
System.out.println("In Pow.wow");
}
}

abstract class Wow{

static void wow(){ // LINE 9
System.out.println("In Wow.wow");
}
}

public class Powwow extends Wow implements Pow {
public static void main(String[] args) {
Powwow f = new Powwow();
f.wow();
}
}

Select 2 option(s):

Q11. Given:

//Insert code here

public abstract void draw();
}


//Insert code here
public void draw(){ System.out.println("in draw..."); }
}

Which of the following lines of code can be used to complete the above code?

Select 2 option(s):

Q12. Consider the following code:

String[] dataList = {"x", "y", "z"};
for (var dataElement : dataList) {
int innerCounter = 0;
while (innerCounter < dataList.length) {
System.out.println(dataElement + ", " + innerCounter);
innerCounter++;
}

}

How many times will the output contain 2?

Select 1 option(s):

Q13. Given:

class T extends Thread
{
public T(String name){ super(name); }

public void run()
{
try{
for(int i=0; i<2; i++){
Thread.sleep(1000);
System.out.println(getName()+" "+getState());
}
}catch(InterruptedException ie){
System.out.println(getName()+" "+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(300);
t1.interrupt();
}
}

Which of the following is a possible output?

Select 2 option(s):

Q14. Consider the following class:

public class Student implements Serializable{
public static final long serialVersionUID = 1;
public String name;
public String grade;
public String toString(){ return "["+name+", "+grade+"]"; }
}

An object of this class was created as follows and was serialized to a file c:\temp\bob.ser:
Student s = new Student();
s.name = "bob";
s.grade = "10";
After some time the Student class was changed as follows:
public class Student implements Serializable{
public static final long serialVersionUID = 1;
public String id="S111";
public String name;
public String grade;
public int age=15;
public String toString(){ return "["+id+", "+name+", "+grade+", "+age+"]"; }
}
Now, the serialized file is read back as follows:
FileInputStream fis = new FileInputStream("c:\\temp\\bob.ser");
ObjectInputStream is = new ObjectInputStream(fis);
s = (Student) is.readObject();
is.close();
System.out.println("Loaded "+s);

What will it print?

Select 1 option(s):

Q15. What will the following command show?

jdeps --list-deps moduleA.jar

Select 2 option(s):

Q16. Which line will print the string "MUM"?

public class TestClass{
public static void main(String args []){
String s = "MINIMUM";
System.out.println(s.substring(4, 7)); //1
System.out.println(s.substring(5)); //2
System.out.println(s.substring(s.indexOf('I', 3))); //3
System.out.println(s.substring(s.indexOf('I', 4))); //4
}
}

Select 1 option(s):

Q17. Given:

import java.util.*;
public class TestClass {
public static void main(String[] args) throws Exception {
ArrayList al = new ArrayList();

//INSERT CODE HERE
}
}

What can be inserted in the above code so that it can compile without any error?

Select 2 option(s):

Q18. Given:

class Data implements Serializable{
int id = 20;
static LocalDate dummyDate = LocalDate.of(2000, 01, 01);
transient LocalDate ld = LocalDate.of(2010, 01, 01);

private void readObject(ObjectInputStream stream)
throws IOException, ClassNotFoundException {
System.out.println("in readObject before " +id+" "+ld);
stream.defaultReadObject();
System.out.println("in readObject after " + id+" "+ld);
ld = dummyDate;
}
public Data(int id, LocalDate ld){
this.id = id; this.ld = ld;
}
public String toString(){
return "Data "+id+" "+ld;
}
}
public class TestClass {
public static void main(String[] args) throws IOException, ClassNotFoundException{

Data d = new Data(10, LocalDate.of(2024, 10, 10));
ObjectOutputStream oos = new ObjectOutputStream( new FileOutputStream("c:\\temp\\data.ser"));
oos.writeObject(d); oos.close();

ObjectInputStream ois = new ObjectInputStream( new FileInputStream("c:\\temp\\data.ser"));
d = (Data) ois.readObject();
System.out.println(d);
}
}

What will be the output?

Select 1 option(s):

Q19. What will be the output of the following program ?

class CorbaComponent{
String ior;
CorbaComponent(){ startUp("IOR"); }
void startUp(String s){ ior = s; }
void print(){ System.out.println(ior); }
}

class OrderManager extends CorbaComponent{
OrderManager(){ }
void startUp(String s){ ior = getIORFromURL(s); }
String getIORFromURL(String s){ return "URL://"+s; }
}

public class Application{
public static void main(String args[]){ start(new OrderManager()); }
static void start(CorbaComponent cc){ cc.print(); }
}

Select 1 option(s):

Q20. Consider the following code:

public class Student {
private Map marksObtained
= new HashMap();
private ReadWriteLock lock = new ReentrantReadWriteLock();
public void setMarksInSubject(String subject, Integer marks){
// 1 INSERT CODE HERE
try{
marksObtained.put(subject, marks);
}finally{
// 2 INSERT CODE HERE
}

}
public double getAverageMarks(){
// valid code that computes average
}
}

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

Select 1 option(s):

Q21. Consider the following method...

public int setVar(int a, int b, float c) { ...}

Which of the following methods correctly overload the above method?

Select 2 option(s):

Q22. Given that Daylight Savings Time ends on Nov 6th 2022 at 2 AM in US/Eastern time zone. (As a result, 2 AM becomes 1 AM. In other words, one minute after 1.59 AM, the clock shows 1 AM instead of 2 AM.), what will the following code print?

LocalDateTime ld = LocalDateTime.of(2022, Month.NOVEMBER, 6, 1, 30);
ZonedDateTime date1 = ZonedDateTime.of(ld, ZoneId.of("US/Eastern"));
ZonedDateTime date2 = date1.plusHours(1);
System.out.println( Duration.ofSeconds( date1.getOffset().compareTo(date2.getOffset()))
.toHours() );

Select 1 option(s):

Q23. Consider the following array definitions:

int[] array1, array2[];
int[][] array3;
int[] array4[], array5[];

Which of the following are valid statements?

Select 3 option(s):

Q24. Given:

class Base{
public List transform(List list)
{
return new ArrayList();
}
}

class Derived extends Base{
*INSERT CODE HERE*
}

What can be inserted in the above code?

Select 2 option(s):

Q25. Given:

public class Student {
private String name;
private int marks;

//constructor and getters and setters not shown

public void addMarks(int m){
this.marks += m;
}
public void debug(){
System.out.println(name+":"+marks);
}
}

What will the following code print when compiled and run?

List slist = Arrays.asList(new Student("S1", 40),
new Student("S2", 35), new Student("S3", 30));

Consumer increaseMarks = s->s.addMarks(10);
slist.forEach(increaseMarks);
slist.stream().forEach(Student::debug);

Select 1 option(s):

Q26. Which code fragments will print the last argument given on the command line to the standard output, and exit without any output or exception stack trace if no arguments are given?

1.
public static void main(String args[ ]){
if (args.length != 0) System.out.println(args[args.length-1]);
}

2.
public static void main(String args[ ]){
try { System.out.println(args[args.length-1]); }
catch (ArrayIndexOutOfBoundsException e) { }
}

3.
public static void main(String args[ ]){
int i = args.length;
if (i != 0) System.out.println(args[i-1]);
}

4.
public static void main(String args[ ]){
int i = args.length-1;
if (i > 0) System.out.println(args[i]);
}

5.
public static void main(String args[ ]){
try { System.out.println(args[args.length-1]); }
catch (NullPointerException e) {}
}

Select 3 option(s):

Q27. What will the following code print when compiled and run?

List names = Arrays.asList("charles", "chuk", "cynthia", "cho", "cici");
int x = names.stream().filter(name->name.length()>4).collect(Collectors.counting());
System.out.println(x);

Select 1 option(s):

Q28. Which of these array declarations and initializations are NOT legal?

Select 2 option(s):

Q29. You are writing a class named Bandwidth for an internet service provider that keeps track of number of bytes consumed by a user. The following code illustrates the expected usage of this class -

class User{
Bandwidth bw = new Bandwidth();

public void consume(int bytesUsed){
bw.addUsage(bytesUsed);
}
... other irrelevant code
}

class Bandwidth{
private int totalUsage;
private double totalBill;
private double costPerByte;


//add your code here

...other irrelevant code
}

Your goal is to implement a method addUsage (and other methods, if required) in Bandwidth class such that all the bandwidth used by a User is reflected by the totalUsage field and totalBill is always equal to totalUsage*costPerByte. Further, that a User should not be able to tamper with the totalBill value and is also not able to reduce it.

Which of the following implementation(s) accomplishes the above?

Select 1 option(s):

Q30. What is the result of executing the following fragment of code:

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

Select 1 option(s):

Q31. Consider the following code.

import java.time.*;
import java.time.format.*;
public class TestClass
{
public static void main(String[] args) throws Exception
{
LocalDate d = LocalDate.now();
//INSERT CODE HERE
System.out.println(s);
}
}

What should be inserted in the code above so that it will print the date in the following format:

Saturday 1st day of January 2000

Select 1 option(s):

Q32. Given :

interface Process{
public void process(int a, int b);
}

public class Data{
int value;
Data(int value){
this.value = value;
}
}

and the following code fragments:
public void processList(ArrayList dataList, Process p){
for(Data d: dataList){
p.process(d.value, 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 1 4 9?

Select 3 option(s):

Q33. Given:

class LowBalanceException extends ______{ //1
public LowBalanceException(String msg){ super(msg); }
}

class WithdrawalException extends ______{ //2
public WithdrawalException(String msg){ super(msg); }
}
class Account{
double balance;
public void withdraw(double amount) {
try{
throw new LowBalanceException("Not Implemented");
}catch(WithdrawalException e){
throw new RuntimeException(e.getMessage());
}
}
public static void main(String[] args) {
try{
Account a = new Account();
a.withdraw(100.0);
}catch(WithdrawalException e){
System.out.println(e.getMessage());
}
catch(Exception e){
System.out.println(e.getMessage());
}
}
}

What can be inserted in the above code at //1 and //2 so that it will print "Not Implemented" when run?

Select 1 option(s):

Q34. 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):

Q35. A new Java programmer has written the following method that takes an array of ints and sums up all the integers that are less than 100.

public void processArray(int[] values){
int sum = 0;
int i = 0;
try{
while(values[i]<100){
sum = sum +values[i];
i++;
}
}
catch(Exception e){ }
System.out.println("sum = "+sum);
}

Which of the following can be considered a good practice to improve this code?

Select 2 option(s):

Q36. What will be the contents of d at the end of the following code?

Deque d = new ArrayDeque();
d.push(1);
d.offerLast(2);
d.push(3);
d.peekFirst();
d.removeLast();
d.pop();
System.out.println(d);

Select 1 option(s):

Q37. Given:

class Game{ }
class Cricket extends Game{ }
class Instrument{ }
class Guitar extends Instrument{ }

interface Player{ void play(E e); }
interface GamePlayer extends Player{ }
interface MusicPlayer extends Player{ }

Identify valid declarations.

Select 1 option(s):

Q38. Consider the following code:

class A{
public XXX m1(int a){
return a*10/4-30;
}
}
class A2 extends A{
public YYY m1(int a){
return a*10/4.0;
}
}

What can be substituted for XXX and YYY so that it can compile without any problems?

Select 1 option(s):

Q39. Identity correct statements about the following code:

Select 1 option(s)

Q40. Consider the following program:

public class TestClass{
public static void main(String[] args) {
calculate(2);
}
public static void calculate(int x){
final int TWO = 2;
String val =
switch(x){
case TWO ->
default -> "def";
};
System.out.println(val);
}
}

What will happen if you try to compile and run the program?

Select 1 option(s):

Q41. Consider the following code:

interface Bar{
void bar();
default void printBar(){
print("printing");
}
private void showBar(){
print("showing");
}
public static void print(String x){
System.out.println(x+" bar");
};
}

class FooBar implements Bar{
public void bar(){
System.out.println("In foobar");
}
}

public class TestClass {
public static void main(String[] args){
//INSERT CODE HERE
}
}

What can be inserted in the above code?

Select 2 option(s):

Q42. What will be the result of attempting to compile and run the following code?

class SwitchTest{
public static void main(String args[]){
for ( var i = 0 ; i < 3 ; i++){ //1
var flag = false;
switch (i){ //2
flag = true; //3
}
if ( flag ) System.out.println( i );
}
}
}

Select 1 option(s):

Q43. What will the following code print?

public class Test{
public static void testInts(Integer obj, int var){
obj = var++;
obj++;
}
public static void main(String[] args) {
Integer val1 = Integer.valueOf(5);
int val2 = 9;
testInts(val1++, ++val2);
System.out.println(val1+" "+val2);
}
}

Select 1 option(s):

Q44. Consider the following code:

public class SubClass extends SuperClass{
int i, j, k;
public SubClass( int m, int n ) { i = m ; j = m ; } //1
public SubClass( int m ) { super(m ); } //2
}

Which of the following constructors MUST exist in SuperClass for SubClass to compile correctly?

Select 2 option(s):

Q45. What will the following program print?

public class TestClass{
public static void main(String[] args){
for : for(var i = 0; i< 10; i++){
for (var j = 0; j< 10; j++){
if ( i+ j > 10 ) break for;
}
System.out.println( "hello");
}
}
}

Select 1 option(s):

Q46. What will happen when the following program is compiled and run?

public class SM{
public String checkIt(String s){
if(s.length() == 0 || s == null){
return "EMPTY";
}
else return "NOT EMPTY";
}

public static void main(String[] args){
SM a = new SM();
System.out.println(a.checkIt(null));
}
}

Select 1 option(s):

Q47. What will the following code print when run?

import java.util.function.*;
class Employee{
int age;
}

public class TestClass{

public static void main(String[] args) {
Employee e = new Employee();
Supplier se = ()->{ e.age = 40; return e; }; //1
e.age = 50;//2
System.out.println(se.get().age); //3
}
}

Select 1 option(s):

Q48. Given:

record Point(int x, int y){};

Identify valid method implementations.

Select 2 option(s):

Q49. Which of the following are benefits of the Java module system?

Select 1 option(s):

Q50.Consider the following code:

try(var sp = Files.walk(Path.of("c:\\temp"), 2, FileVisitOption.FOLLOW_LINKS)){
sp.filter(p -> p.getName(p.getNameCount()-1).toString().contains("n"))
.sorted()
.forEach(System.out::println);
}

What will be the output if the directory structure is as follows:

c:\temp\
face.jpg
surnames.txt
documents\
files.txt
pdfs\
new.pdf

Select 1 option(s):

Q51. Given:

enum Coffee
{
ESPRESSO("Very Strong"), MOCHA("Bold"), LATTE("Mild");
public String strength;
Coffee(String strength)
{
this.strength = strength;
}
public String toString(){ return strength; }
}

Which of the given code snippets will produce the following output:
ESPRESSO:Very Strong, MOCHA:Bold, LATTE:Mild,

Select 1 option(s):

Q52. Given:

List list = Arrays.asList(-1, 1, 2);
String str = list.stream().collect(Collectors.mapping(v -> ""+Transformer.transform(v), Collectors.joining(" ")));
System.out.println(str);

Which of the following implementations of Transformer enum will cause the above code to print -1 2 1?

Select 1 option(s):

Q53. Identify correct statements about the modular JDK.

Select 4 option(s):

Q54. Given:

interface Account{
int LIMIT = 100;
public default boolean canWithdraw(int amount){
return false;
}
public static int getBalanceAmount(int amount){
return LIMIT - amount;
}
int makeBid();
String toString();
}

public class VirtualAccount implements Account{

//INSERT CODE HERE

int amount;
public VirtualAccount(int amount){
this.amount = amount;
}

public static void main(String[] args) {
try{
VirtualAccount va = new VirtualAccount(10);
int balance = va.makeBid();
System.out.println("Account Balance : "+va.amount+" Balance: "+balance);
}catch(Exception e){
System.out.println(e);
}
}
}


Which of the following options when inserted in the above code will make the VirtualAccount class correctly implement the Account interface?

Note: You may find a few very long questions in the real exam. Eliminating obviously wrong options quickly will help you save time while attempting such questions.

Select 2 option(s):