Free Oracle 1Z0-809 Exam Questions

Question 1

Given the code fragments:

class MyThread implements Runnable {

private static AtomicInteger count = new AtomicInteger (0);

public void run () {

int x = count.incrementAndGet();

System.out.print (x+” “);

}

and

Thread thread1 = new Thread(new MyThread());

Thread thread2 = new Thread(new MyThread());

Thread thread3 = new Thread(new MyThread());

Thread [] ta = {thread1, thread2, thread3};

for (int x= 0; x < 3; x++) {

ta[x].start();

}

Which statement is true?

A : The program prints 1 2 3 and the order is unpredictable

B : The program prints 1 2 3.

C : The program prints 1 1 1

D : A compilation error occurs.

Answer: A

Question 2

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

Question 3

Given the code fragment:

9. Connection conn = DriveManager.getConnection(dbURL, userName, passWord);

10. String query = “SELECT id FROM Employee”;

11. try (Statement stmt = conn.createStatement()) {

12. ResultSet rs = stmt.executeQuery(query);

13. stmt.executeQuery(“SELECT id FROM Customer”);

14. while (rs.next()) {

15. //process the results

16. System.out.println(“Employee ID: “+ rs.getInt(“id”));

17. }

18. } catch (Exception e) {

19. System.out.println (“Error”);

20. }

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 and Customer tables are available and each table has id column with a few records and

the SQL queries are valid.

What is the result of compiling and executing this code fragment?

A : The program prints employee IDs.

B : The program prints customer IDs

C : The program prints Error

D : compilation fails on line 13.

Answer: C

Question 4

Given:

and the code fragment:

What is the result?

A : A compilation error occurs at line n2.

B : A compilation error occurs because the try block doesn’t have a catch or finally block.

C : A compilation error occurs at line n1.

D : The program compiles successfully.

Answer: B

Question 5

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. import java.util.List;

4. import java.util.Map;

5. import java.util.stream.Collectors;

6. import java.util.stream.Stream;

7.

8. class Certification {

9. String studId;

10. String test;

11. int marks;

12.

13. Certification(String studId, String test, int marks) {

14. this.studId = studId;

15. this.test = test;

16. this.marks = marks;

17. }

18.

19. public String toString() {

20. return "{" + studId + ", " + test + ", " + marks + "}";

21. }

22.

23. public String getStudId() {

24. return studId;

25. }

26.

27. public String getTest() {

28. return test;

29. }

30.

31. public int getMarks() {

32. return marks;

33. }

34. }

35.

36. public class Test {

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

38. Certification c1 = new Certification("S001", "OCA", 87);

39. Certification c2 = new Certification("S002", "OCA", 82);

40. Certification c3 = new Certification("S001", "OCP", 79);

41. Certification c4 = new Certification("S002", "OCP", 89);

42. Certification c5 = new Certification("S003", "OCA", 60);

43. Certification c6 = new Certification("S004", "OCA", 88);

44.

45. Stream stream = Stream.of(c1, c2, c3, c4, c5, c6);

46. Map> map =

47. stream.collect(Collectors.partitioningBy(s -> s.equals("OCA")));

48. System.out.println(map.get(true));

49. }

50. }

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

A : []

B : [{S001, OCA, 87}, {S002, OCA, 82}, {S001, OCP, 79}, {S002, OCP, 89}, {S003, OCA, 60}, {S004, OCA, 88}]

C : [{S001, OCA, 87}, {S002, OCA, 82}, {S003, OCA, 60}, {S004, OCA, 88}]

D : [{S001, OCP, 79}, {S002, OCP, 89}]

Answer: A