Oracle Java 17 1Z0-829 Certification Exam Practice Test 3

Q. Given code:

package com.javainuse.ocp;
class NumberPrinter {
private int maxNumber = 5;
public class PyramidPrinter {
public PyramidPrinter(int n) {
if(n > 0 && n <= 10)
maxNumber = n;
}
public void printPyramid() {
for(int i = 1; i <= maxNumber; i++) {
String line = " ".repeat(maxNumber - i);
for(int j = 1; j <= i; j++) {
line += j + " ";
}
System.out.println(line.trim());
}
}
}
}
public class Test {
public static void main(String[] args) {
//Insert statement here
}
}

Which statement when inserted in the main(String[] args) method will print a pyramid pattern of numbers from 1 to 5?

new NumberPrinter().PyramidPrinter(5).printPyramid();
new NumberPrinter.PyramidPrinter(5).printPyramid();
new NumberPrinter().new PyramidPrinter(5).printPyramid();
NumberPrinter.PyramidPrinter(5).printPyramid();
Check Answer

Q. Your team has provided you with a modular jar for logging functionality. Given the file structure and module information, which javac command will successfully compile your module code?

Jar File name: logger.jar
Module name: logger
Class name: com.logging.util.Logger
Method: public static void log(String message) {...}

module-info.java contents:

module logger {
    exports com.logging.util to appmodule;
}


File/Directory structure on your Windows platform is:

C:
+---src
|   \---appmodule
|       |   module-info.java
|       |
|       \---com
|           \---myapp
|               \---main
|                       App.java
|
+---bin
\---lib
        logger.jar


C:\src\appmodule\module-info.java:

module appmodule {
    requires logger;
}


C:\src\appmodule\com\myapp\main\App.java:

package com.myapp.main;
 
import com.logging.util.Logger;
 
public class App {
    public static void main(String[] args) {
        Logger.log("Application started");
    }
}

Which javac command will successfully compile your module code?

javac -d bin --module-source-path src -p lib\logger.jar -m appmodule
javac -d bin --module-source-path src,lib\logger.jar -m appmodule
javac -d bin --module-source-path src;lib\logger.jar -m appmodule
javac -d bin --module-source-path src --module-class-path lib\logger.jar -m appmodule
Check Answer

Q. Given code:

package com.javainuse.ocp;

class Outer {
    Outer() {
        System.out.print("B");
    }
    /INSERT 1/
    
    class Inner {
        Inner() {
            System.out.print("D");
        }
        /INSERT 2/
    }
}

public class Test {
    public static void main(String[] args) {
        new Outer().new Inner();
    }
}

Which pair of insertions will result in the output "ABCD" when the Test class is executed?

Replace /INSERT 1/ with {System.out.print("A");} and /INSERT 2/ with {System.out.print("C");}
Replace /INSERT 1/ with static {System.out.print("A");} and /INSERT 2/ with {System.out.print("C");}
Replace /INSERT 1/ with {System.out.print("A");} and /INSERT 2/ with static {System.out.print("C");}
Replace /INSERT 1/ with static {System.out.print("A");} and /INSERT 2/ with static {System.out.print("C");}
Check Answer

Q. Consider the following code in the Test.java file:

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
boolean flag1 = 1 == 1;
boolean flag2 = 2;
System.out.println(flag1 + flag2);
}
}

What will be the result?

true
2
Compilation error
Runtime exception
Check Answer

Q. Given the following code in the Test.java file:

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
var b = 10;
var y = 30;
switch(y) {
case 20 ->
b += 5;
case 30 ->
b *= 2;
case 40 ->
b -= 5;
}
System.out.println(b);
}
}

What will be the output?

10
15
20
25
5
Check Answer

Q. Given the following code:

package com.javainuse.ocp;
import java.util.concurrent.ExecutionException;
import java.util.concurrent.Executors;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
public class Test {
public static void main(String[] args) throws InterruptedException, ExecutionException, TimeoutException {
var es = Executors.newFixedThreadPool(2);
var f1 = es.submit(() -> "Task 1");
var f2 = es.submit(() -> {
Thread.sleep(100);
return "Task 2";
});
var f3 = es.submit(() -> {}, "Task 3");
System.out.println(f1.get(1, TimeUnit.MINUTES));
System.out.println(f2.get(2, TimeUnit.MINUTES));
System.out.println(f3.get(3, TimeUnit.MINUTES));
es.shutdown();
}
}

What will be the result of executing this code?

The code will take at least 6 minutes to execute
The code will take at least 3 minutes to execute
The code will take at least 1 minute to execute
The code may finish execution within a few seconds
The code will cause a TimeoutException
Check Answer

Q. Consider the following code in the Test.java file:

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
String str = " "; //single space
boolean b1 = str.isEmpty();
boolean b2 = str.isBlank();
System.out.println(b1 + " : " + b2); //Line n1
Copy    str.strip(); //Line n2
    b1 = str.isEmpty();
    b2 = str.isBlank();
    System.out.println(b1 + " : " + b2); //Line n3
}
}

What will be the output?

true : false
true : false
false : true
false : true
false : true
true : true
true : true
true : true
false : false
false : false
Check Answer

Q. Given the following code in the Test.java file:

package com.javainuse.ocp;
abstract class Animal {
abstract void jump() throws RuntimeException;
}
class Deer extends Animal {
void jump() { //Line n1
System.out.println("DEER JUMPS");
}
Copyvoid jump(int i) {
    System.out.println("DEER JUMPS TO " + i + " FEET");
}
}
public class Test {
public static void main(String[] args) {
Animal animal = new Deer();
((Deer)animal).jump(); //Line n2
((Deer)animal).jump(5); //Line n3
}
}

What will be the result?

Line n1 causes compilation error
Line n2 causes compilation error
Test class executes successfully and prints:
DEER JUMPS
DEER JUMPS TO 5 FEET
An exception is thrown at runtime
Line n3 causes compilation error
Check Answer

Q. Given the following code:

package com.javainuse.ocp;
class Container<E implements Comparable> {
private E element;
Copypublic void setElement(E element) {
    this.element = element;
}

public E getElement() {
    return element;
}
}
public class Test {
public static void main(String[] args) {
Container<String> container = new Container<>();
container.setElement("Hello World");
System.out.println(container.getElement());
}
}

Which statement is true about the compilation and execution of the Test class?

The code compiles and runs successfully, printing "Hello World"
The code fails to compile due to an error in the Container class declaration
The code fails to compile due to an error in the Test class
The code compiles but throws a runtime exception
Check Answer

Q. Given the following code:

package com.javainuse.ocp;
import java.util.function.BinaryOperator;
public class Test {
public static void main(String[] args) {
BinaryOperator<String> operator = String::concat;
System.out.println(operator.apply("Hello ", "World"));
}
}

What will be the output when the Test class is executed?

Compilation error
HelloWorld
Runtime error
Hello World
Check Answer

Q. Given the following code:

package com.javainuse.ocp;
import java.nio.file.*;
public class Test {
public static void main(String[] args) {
var path = Paths.get("C:", "users", ".", "..", "documents", "file.txt").normalize();
System.out.println(path.getNameCount() + ":" + path.getName(1));
}
}

What will be the output when the Test class is executed?

2:documents
3:users
2:users
An exception is thrown at runtime
1:documents
Check Answer

Q. Given code:

package com.javainuse.ocp;
interface Greeting {
default void sayHello() {
System.out.println("Hello from Greeting");
}
Copystatic void printInfo() {
    printVersion();
    printAuthor();
}

private static void printAuthor() {
    System.out.println("Author: John Doe");
}

private static void printVersion() {
    System.out.println("Version: 1.0");
}

String toString();
}
interface CustomGreeting extends Greeting {
void greet();
}
public class GreetingTest {
public static void main(String[] args) {
CustomGreeting customGreeting = () -> System.out.println("Custom greeting!");
customGreeting.greet();
customGreeting.sayHello();
}
}

What will be the output when the main method is executed?

Compilation error in Greeting interface
Compilation error in GreetingTest class
Runtime exception when executing GreetingTest
Custom greeting!
Hello from Greeting
Check Answer

Q. Given code:

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
int x = 5;
int y = ++x * x-- + x++ - --x;
System.out.println("x = " + x);
System.out.println("y = " + y);
}
}

What will be the output when the main method is executed?

x = 5, y = 36
x = 6, y = 36
x = 5, y = 35
x = 6, y = 35
Check Answer

Q. Given code:

package com.javainuse.ocp;
import java.util.*;
public class Test {
public static void main(String[] args) {
Set<Integer> set = new TreeSet<>(Arrays.asList(10, null, 5, null, 15));
long count = set.stream().count();
System.out.println(count);
}
}

What will be the result when the main method is executed?

5
3
Runtime Exception
0
Check Answer

Q. Given code:

package com.javainuse.ocp;
class Circle {
private double radius;
Copypublic Circle(double radius) {
    this.radius = radius;
}

public double getRadius() {
    return radius;
}

public double getArea() {
    return Math.PI * radius * radius;
}
}
public class TestCircle {
public static void main(String[] args) {
protected double r = 5.0;
final double PI = 3.14159;
Circle circle = new Circle(r);
System.out.println("Radius: " + circle.getRadius() + ", Area: " + circle.getArea());
}
}

What will be the result when attempting to compile and run the TestCircle class?

Radius: 5.0, Area: 78.53975
Compilation Error
Radius: 0.0, Area: 0.0
Runtime Exception
Check Answer

Q. Consider a module named 'core' with two packages: 'com.javainuse.service' and 'com.javainuse.service.impl'. Which of the following module descriptor files correctly exports both packages while only opening 'com.javainuse.service.impl' for reflection?

module core {
    exports com.javainuse.service, com.javainuse.service.impl;
    opens com.javainuse.service.impl;
}

open module core {
    exports com.javainuse.service;
    exports com.javainuse.service.impl;
}

module core {
    exports com.javainuse.service;
    exports com.javainuse.service.impl;
    open com.javainuse.service.impl;
}

module core {
    exports, opens com.javainuse.service, com.javainuse.service.impl;
}

module core {
    exports com.javainuse.service;
    exports com.javainuse.service.impl;
    opens com.javainuse.service.impl;
}

Check Answer

Q. Which of the following statements is correct about the @FunctionalInterface annotation?

It is mandatory to use @FunctionalInterface for all interfaces with a single abstract method.
The @FunctionalInterface annotation can be applied to classes and methods.
An interface marked with @FunctionalInterface can have multiple abstract methods.
The @FunctionalInterface annotation is used at runtime by the JVM to perform special optimizations.
The @FunctionalInterface annotation helps the compiler to verify that the interface has only one abstract method.
Check Answer

Q. Given code:

package com.javainuse.ocp;
import java.util.ArrayList;
import java.util.List;
public class Test {
public static void main(String[] args) {
List<Integer> list = new ArrayList<>();
list.add(10);
list.add(20);
list.add(30);
Copy    list.remove(Integer.valueOf(20));

    System.out.println(list);
}
}

What will be the output when the main method is executed?

[10, 20, 30]
[10, 30]
[20, 30]
An exception is thrown at runtime
Compilation error
Check Answer

Q. Given code:

package com.javainuse.ocp;
import java.util.*;
record Employee(String name, double salary) {
public String toString() {
return "Employee (" + name + ", " + salary + ")";
}
Copypublic static int compareBySalary(Employee e1, Employee e2) {
    return Double.compare(e2.salary, e1.salary);
}
}
public class Test {
public static void main(String[] args) {
List<Employee> employees = Arrays.asList(
new Employee("Alice", 50000),
new Employee("Bob", 60000),
new Employee("Charlie", 55000));
employees.sort(Employee::compareBySalary);
System.out.println(employees);
}
}

What will be the output when the main method is executed?

[Employee (Alice, 50000.0), Employee (Charlie, 55000.0), Employee (Bob, 60000.0)]
[Employee (Bob, 60000.0), Employee (Charlie, 55000.0), Employee (Alice, 50000.0)]
Compilation error
An exception is thrown at runtime
Check Answer

Q. Will the following code compile successfully?

package com.javainuse.ocp;
class Outer {
enum Color {
RED, GREEN, BLUE;
Copy    private void printColor() {
        System.out.println(this);
    }
}
}

Yes
No
Check Answer

Q. Consider the following statements. How many of them will print Hello, World! exactly as shown (with a newline after 'Hello,')?

1. System.out.println("""
   Hello,
   World!
   """);

System.out.println("""
Hello,
World!
""");
System.out.print("Hello,
World!");
System.out.println(String.format("%s
%s", "Hello,", "World!"));

Select the correct answer:

Only one statement
Only two statements
Only three statements
All four statements
None of the statements
Check Answer

Q. Given the code below, which of the following statements can replace Line n1 such that there is no change in the output?

package com.javainuse.ocp;
import java.util.function.Function;
public class Test {
public static void main(String[] args) {
Function<Integer, Integer> f = x -> x * 2;
Function<Integer, Integer> g = y -> y + 3;
Copy    Function<Integer, Integer> fog = f.andThen(g); //Line n1
    System.out.println(fog.apply(5));
}
}

Select the correct option:

Function<Integer, Integer> fog = g.compose(f);
Function<Integer, Integer> fog = f.compose(g);
Function<Integer, Integer> fog = g.andThen(f);
All of the above
None of the above
Check Answer

Q. Given the code below, what will be the output when the main method is executed?

package com.javainuse.ocp;
import java.util.function.IntFunction;
import java.util.function.IntUnaryOperator;
import java.util.stream.Stream;
public class Test {
public static void main(String[] args) {
int seed = 1;
var stream = Stream.iterate(seed, i -> i <= 8, i -> i * 2); //Line n1
IntFunction<IntUnaryOperator> func = m -> n -> n + m; //Line n2
stream.mapToInt(i -> i).map(func.apply(3)).forEach(System.out::print); //Line n3
}
}

Select the correct output:

4578
4811
1357
Compilation error
Runtime exception
Check Answer

Q. Given Question

Which of the following scenarios is best suited for using the CompletableFuture framework in Java?
Select the best option:

Tasks that involve heavy database transactions with multiple table updates
Tasks that require sequential processing of large data sets
Tasks that involve long-running network operations that can be executed concurrently
Tasks that require frequent user interaction and input
Check Answer

Q. Given Question

Does the introduction of Java Records improve code conciseness and reduce boilerplate code? Select the correct answer:

No
Yes
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.time.LocalDateTime;
class Outer {
private static class Inner {
public static LocalDateTime getDateTime() {
return LocalDateTime.now();
}
}
}
public class Test {
public static void main(String[] args) {
System.out.println(Outer.Inner.getDateTime().getDayOfWeek());
}
}

Which statement is correct about the output when the main method is executed?
Select the correct statement:

It will print the current day of the week (e.g., MONDAY, TUESDAY, etc.)
Code fails to compile
It will print any int value between 1 and 7
Code compiles successfully but throws a Runtime exception
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.time.*;
public class Test {
public static void main(String[] args) {
Duration d1 = Duration.ofHours(24);
Duration d2 = Duration.ofMinutes(1440);
System.out.println(d1.equals(d2) + ":" + d1);
}
}

What will be printed when the main method is executed?
Select the correct output:

true:PT24H
false:PT24H
true:P1D
false:P1D
Check Answer

Q. Given code

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
var temperature = 25; // Line n1
var status = "Normal"; // Line n2
if (0 < temperature <= 20) // Line n3
status = "Cold";
else if (20 < temperature <= 30) // Line n4
status = "Comfortable";
else if (temperature > 30)
status = "Hot";
System.out.println(status);
}
}

What will be the output when the main method is executed?
Select the correct output:

Normal
Cold
Comfortable
Hot
Compilation error
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.util.*;
public class Test {
public static void main(String[] args) {
var set = new TreeSet<String>(Set.of("JAVA", "IS", "AWESOME", "AND", "FUN")); //Line n1
set.add("PROGRAMMING"); //Line n2
set.removeIf(s -> s.length() <= 2); //Line n3
set.forEach(System.out::print); //Line n4
}
}

What will be the output when the main method is executed?
Select the correct output:

AWESOMEFUNJAVAPROGRAMMING
FUNJAVAISAWESOMEPROGRAMMING
AWESOMEFUNJAVAPROGRAMMINGIS
Compilation error
Check Answer

Q. Given code

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
try {
try {
System.out.print("A-");
throw new IllegalArgumentException();
} catch (RuntimeException e) {
System.out.print("B-");
throw new IllegalStateException();
} finally {
System.out.print("C-");
}
} catch (Exception e) {
System.out.print("D-");
} finally {
System.out.print("E");
}
}
}

What will be the output when the main method is executed without any command-line arguments?
Select the correct output:

A-B-C-D-E
A-C-D-E
A-B-C-E
A-B-E
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.util.function.Function;
import java.util.function.UnaryOperator;
import java.util.stream.Stream;
record Product(String name, double price) {}
public class Test {
public static void main(String[] args) {
Function<Product, Double> extractor = prod -> prod.price();
UnaryOperator<Double> operator = d -> d * 1.1;
double total = Stream.of(new Product("Laptop", 999.99),
new Product("Phone", 599.99),
new Product("Tablet", 399.99))
.map(extractor.andThen(operator))
.reduce(0.0, (a, b) -> a + b);
System.out.println(Math.round(total));
}
}

What will be the output when the main method is executed?
Select the correct output:

2000
2199
2200
2201
Check Answer

Q. Given the structure of the EMPLOYEE table:

EMPLOYEE (ID integer, NAME varchar(100), SALARY decimal(10,2), PRIMARY KEY (ID))

And the following code, which of the options can be used to replace /INSERT/ such that there is no compilation error?

package com.javainuse.ocp;
import java.sql.*;
public class Test {
public static void main(String[] args) throws SQLException {
var url = "jdbc:mysql://localhost:3306/company";
var user = "admin";
var password = "admin123";
Copy    try (var con = DriverManager.getConnection(url, user, password);
         var stmt = /INSERT/) {
        
    }
}
}

Select all correct options:

con.createStatement("SELECT * FROM EMPLOYEE")
con.prepareStatement("SELECT * FROM EMPLOYEE")
con.createStatement()
con.prepareStatement()
con.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY)
con.prepareStatement("SELECT * FROM EMPLOYEE", ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_READ_ONLY)
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.util.*;
public class Test {
public static void main(String[] args) {
List<Integer> list = Arrays.asList(10, null, 20, 30, null); //Line n1
Set<Integer> set = new HashSet<>(list); //Line n2
System.out.println(set.size()); //Line n3
}
}

What will be the output when the main method is executed?
Select the correct output:

3
4
5
NullPointerException is thrown at runtime
Check Answer

Q. Given the code, what will be the output when the main method is executed?

package com.javainuse.ocp;
import java.util.*;
public class Test {
public static void main(String[] args) {
List<Integer> list = Arrays.asList(10, 20, 30, 40, 50);
ListIterator<Integer> iter = list.listIterator(3);
while(iter.hasNext()) {
System.out.print(iter.next() + " ");
}
while(iter.hasPrevious()) {
System.out.print(iter.previous() + " ");
}
}
}

Select the correct output:

30 40 50 50 40 30 20 10
40 50 50 40 30 20 10
30 40 50 50 40 30
40 50 50 40 30
Check Answer

Q. Given the code snippet:

var set = Set.of(1, 2, 3, 4, 5);

And the following statements:

1. set.forEach(System.out::print);
2. set.stream().forEach(System.out::print);
3. set.stream().sorted().forEach(System.out::print);
4. set.parallelStream().forEachOrdered(System.out::print);
5. System.out.println(set.stream().map(String::valueOf).collect(Collectors.joining()));

How many of the above statements will print the numbers in the order 1, 2, 3, 4, 5?

All five statements
Only four statements
Only three statements
Only two statements
Only one statement
Check Answer

Q. Given the code:

import java.util.*;
import java.util.stream.*;
public class Test {
/Insert-1/
public static void main(String[] args) {
System.out.println(merge(Arrays.asList("A", "B"), Arrays.asList("C", "D")));
}
Copy/Insert-2/
public static <T> List<T> merge(List<T>... lists) {
    return Arrays.stream(lists)
        .flatMap(List::stream)
        .collect(Collectors.toList());
}
}

Which of the following options will suppress the compiler warning without causing compilation errors?

Replace /Insert-1/ with @SuppressWarnings
Replace /Insert-1/ with @SuppressWarnings("unchecked", "rawtypes")
Replace /Insert-2/ with @SuppressWarnings(value="unchecked")
Replace /Insert-2/ with @SafeVarargs
Check Answer

Q. Which of the following are Functional Interfaces in Java?

Select all that apply:

java.util.Observer
java.util.function.Predicate
java.lang.Iterable
java.util.function.Function
java.lang.AutoCloseable
Check Answer

Q. Given that C: is accessible for reading/writing and the directory structure is as follows:

C:
└───Projects

What will be the result of executing the following code?

package com.javainuse.ocp;
import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
public class Test {
public static void main(String[] args) throws IOException {
var path = Paths.get("C:\Projects\Java\NewProject");
Files.createDirectories(path);
}
}

Select the correct answer:

Directories 'Java' and 'NewProject' will be created under 'Projects'
Only directory 'Java' will be created under 'Projects'
An exception is thrown at runtime
No directories will be created and no exception will be thrown
Check Answer

Q. Given code

package com.javainuse.ocp;
import java.util.*;
import java.util.function.Predicate;
record Book(String title, int pages, double price) {
public String toString() {
return title;
}
}
public class Test {
public static void main(String[] args) {
List<Book> library = new ArrayList<>();
library.add(new Book("Java Basics", 300, 29.99));
library.add(new Book("Advanced Java", 500, 49.99));
library.add(new Book("Java Cookbook", 400, 39.99));
library.add(new Book("Java Puzzles", 250, 24.99));
library.add(new Book("Java Reference", 800, 59.99));
Copy    filterAndPrint(library, b -> b.pages() > 300 && b.price() < 50.0);
}

private static void filterAndPrint(List<Book> books, Predicate<Book> criteria) {
    for (Book book : books) {
        if (criteria.test(book)) {
            System.out.print(book + " ");
        }
    }
}
}

What will be the output when the main method is executed? Select the correct output:

Java Basics Advanced Java Java Cookbook Java Puzzles Java Reference
Advanced Java Java Cookbook
Java Basics Java Puzzles
Compilation error
Check Answer

Q. Given code

package com.javainuse.ocp;
interface Factory<T, R> {
R produce(T t);
}
class Product {
Product() {
System.out.println("Default");
}
CopyProduct(int id) {
    System.out.println("ID: " + id);
}
}
public class Test {
public static void main(String[] args) {
Factory<Integer, Product> obj = Product::new;
}
}

What will be the result when the main method is executed? Select the correct result:

Default
ID: 0
Compilation error
It executes fine but no output
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Q. Can you create a macOS application bundle (.app) using jpackage on a Windows machine?

Select the correct answer:

Yes
No
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Q. Given the code, which statement is correct about the enum Season?

package com.javainuse.ocp;
interface Weather {
void getDescription();
}
enum Season implements Weather {
SPRING, SUMMER, AUTUMN, WINTER;
Copypublic void getDescription() {
    System.out.println("This is " + this.name().toLowerCase());
}

public static Season getDefaultSeason() {
    return SPRING;
}
}
public class Test {
public static void main(String[] args) {
Season.SUMMER.getDescription();
}
}

Select the correct statement:

The enum Season can extend another class
The enum Season can extend another enum
The enum Season implicitly extends java.util.Enum
The enum Season can implement interfaces
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Q. Given code:

package com.javainuse.ocp;
public class Test {
public static void main(String[] args) {
int count = 0;
for (int i = 0; i < 5)
System.out.print(i + " ");
i++;
System.out.println("\nCount: " + count);
}
}

What will be the result when the main method is executed?

It will print: 0 1 2 3 4 Count: 0
Compilation error
It will go into an infinite loop
It will print: 0 Count: 0
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Q. Given code:

package com.javainuse.ocp;
import java.util.Set;
import java.util.List;
public class Test {
public static void main(String[] args) {
List<String> list = List.of("RED", "GREEN", "BLUE", "GREEN", "YELLOW");
Set<String> set = Set.copyOf(list);
System.out.println(set.size());
}
}

What will be the result when the main method is executed?

5
4
Compilation error
NullPointerException is thrown at runtime
IllegalArgumentException is thrown at runtime
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