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: Aug 21, 2019

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Question 1

Given:

From what threading problem does the program suffer?

A : ce condition

B : adlock

C : arvation

D : livelock

Answer: B

Question 2

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 3

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. public class Test {

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

9. List list = Arrays.asList(10, 20, 8);

10.

11. System.out.println(list.stream().max(Comparator.comparing(a -> a)).get()); //Line 1

12.

13. System.out.println(list.stream().max(Integer::compareTo).get()); //Line 2

14.

15. System.out.println(list.stream().max(Integer::max).get()); //Line 3

16. }

17. }

Which of the following statement is true?

A : Line 1 and Line 3 print same output

B : Line 2 and Line 3 print same output

C : Line 1 and Line 2 print same output

D : Line 1, Line 2 and Line 3 print same output

Answer: C

Question 4

Given code of Test.java file:

1. package com.udayan.ocp;

3. interface Printer1 {

4. default void print() {

5. System.out.println("Printer1");

6. }

7. }

9. class Printer2 {

10. public void print() {

11. System.out.println("Printer2");

12. }

13. }

14.

15. class Printer extends Printer2 implements Printer1 {

16.

17. }

18.

19. public class Test {

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

21. Printer printer = new Printer();

22. printer.print();

23. }

24. }

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

A : Printer1

B : Compilation error for Printer1

C : Compilation error for Printer

D : Printer2

E : Compilation error for Printer2

Answer: D

Question 5

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 : program prints employee IDs.

B : program prints customer IDs

C : program prints Error

D : mpilation fails on line 13.

Answer: C

Page: 1 / 94

Total 469 Questions | Updated On: Aug 21, 2019

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