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 15, 2026

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Question 1

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 2

You want to create a singleton class by using the Singleton design pattern. Which two statements enforce the singleton nature of the design? (Choose two.)

A : Make the class static.

B : Make the constructor private.

C : Override equals() and hashCode() methods of the java.lang.Object class

D : Use a public reference to point to the single instance

E : Implement the Serializable interface

F : Make the single instance created static and final.

Answer: A,B

Question 3

Given the code fragment:

You have been asked to define the ProductCode class. The definition of the ProductCode class must

allow c1 instantiation to succeed and cause a compilation error on c2 instantiation.

Which definition of ProductCode meets the requirement?

A :

B :

C :

D :

Answer: B

Question 4

Given the code fragment:

Assume that:

The required database driver is configured in the classpath.

The appropriate database is accessible with the dbURL, userName, and passWord exists

The Employee table has a column ID of type integer and the SQL query matches one record.

What is the result?

A : Compilation fails at line 14.

B : Compilation fails at line 15.

C : The code prints the employee ID.

D : The code prints Error.

Answer: A

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 15, 2026

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