Free Oracle 1Z0-809 Exam Questions

Become Oracle Certified with updated 1Z0-809 exam questions and correct answers

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Total 469 Questions | Updated On: Jan 06, 2026

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Question 1

Given the code fragment:

What is the result?

A : A compilation error occurs at line n2.

B : 3

C : 2

D : A compilation error occurs at line n1.

Answer: A

Question 2

Given code of Test.java file:

1. package com.udayan.ocp;

3. import java.util.Arrays;

4. import java.util.Comparator;

5. import java.util.List;

7. class Person {

8. private String firstName;

9. private String lastName;

10.

11. public Person(String firstName, String lastName) {

12. this.firstName = firstName;

13. this.lastName = lastName;

14. }

15.

16. public String getFirstName() {

17. return firstName;

18. }

19.

20. public String getLastName() {

21. return lastName;

22. }

23.

24. public String toString() {

25. return "{" + firstName + ", " + lastName + "}";

26. }

27. }

28.

29. public class Test {

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

31. List list = Arrays.asList(

32. new Person("Tom", "Riddle"),

33. new Person("Tom", "Hanks"),

34. new Person("Yusuf", "Pathan"));

35. list.stream().sorted(Comparator.comparing(Person::getFirstName).reversed()

36. .thenComparing(Person::getLastName)).forEach(System.out::println);

37. }

38. }

What will be the result of compiling and executing Test class?

A : {Yusuf, Pathan}{Tom, Hanks}{Tom, Riddle}

B : {Yusuf, Pathan}{Tom, Riddle}{Tom, Hanks}

C : {Tom, Riddle}{Tom, Hanks}{Yusuf, Pathan}

D : {Tom, Hanks}{Tom, Riddle}{Yusuf, Pathan}

Answer: A

Question 3

Given code of Test.java file:

1. package com.udayan.ocp;

3. public class Test {

4. private static String msg = "Hello";

6. private static String changeMsg(String m) {

7. msg = m;

8. return null;

9. }

10.

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

12. if(args.length == 0) {

13. assert false : changeMsg("Bye");

14. }

15. System.out.println(msg);

16. }

17. }

What will be the result of executing Test class with below command?

java -ea com.udayan.ocp.Test

A : Bye

B : Hello

C : AssertionError is thrown at runtime and program terminates abruptly

Answer: C

Question 4

Given the code fragment:

public class FileThread implements Runnable {

String fName;

public FileThread(String fName) { this.fName = fName; }

public void run () System.out.println(fName);}

public static void main (String[] args) throws IOException,

InterruptedException {

ExecutorService executor = Executors.newCachedThreadPool();

Stream<Path> listOfFiles = Files.walk(Paths.get(“Java Projects”));

listOfFiles.forEach(line -> {

executor.execute(new FileThread(line.getFileName().toString()));

line n1

});

executor.shutdown();

executor.awaitTermination(5, TimeUnit.DAYS); //

line n2

}

The Java Projects directory exists and contains a list of files.

What is the result?

A : The program throws a runtime exception at line n2.

B : The program prints files names concurrently

C : The program prints files names sequentially.

D : A compilation error occurs at line n1

Answer: B

Question 5

Assume that proper import statements are available, and 'fr' is the language code for French language.

And you have the following code snippet:

Locale [] loc = Locale.getAvailableLocales();

Which of the following statements will print all the supported (by the JVM) French Language Locale on to the console?

Select 2 options.

A : Arrays.stream(loc).filter(x -> x.getLanguage().contains("FR")).forEach(System.out::println);

B : Arrays.stream(loc).filter(x -> x.toString().contains("FR")).forEach(System.out::println);

C : Arrays.stream(loc).filter(x -> x.getLanguage().equals("fr")).forEach(System.out::println);

D : Arrays.stream(loc).filter(x -> x.toString().startsWith("fr")).forEach(System.out::println);

E : Arrays.stream(loc).filter(x -> x.startsWith("fr")).forEach(System.out::println);

Answer: C,D

Page: 1 / 94

Total 469 Questions | Updated On: Jan 06, 2026

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