Online 1Z0-809 Practice Test

Question 1

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. import java.util.ArrayDeque;

4. import java.util.Deque;

5.

6. public class Test {

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

8. Deque deque = new ArrayDeque<>();

9. deque.push(new Boolean("abc"));

10. deque.push(new Boolean("tRuE"));

11. deque.push(new Boolean("FALSE"));

12. deque.push(true);

13. System.out.println(deque.pop() + ":" + deque.peek() + ":" + deque.size());

14. }

15. }

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

Options :

A : true:false:3

B : true:true:3

C : false:true:3

D : false:false:3

Answer: A

Question 2

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?

Options :

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 3

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. import java.util.Arrays;

4. import java.util.Comparator;

5. import java.util.List;

6.

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?

Options :

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 the code fragment:

What is the result?

Options :

A : A compilation error occurs at line n2.

B : 3

C :

2

D : A compilation error occurs at line n1.

Answer: A

Question 5

Given code of Test.java file:

package com.udayan.ocp;

import java.util.concurrent.*;

public class Test {

public static void main(String[] args) throws InterruptedException, ExecutionException {

ExecutorService es = Executors.newSingleThreadExecutor();

Future f = es.submit(() -> "HELLO");

System.out.println(f.get());

es.shutdown();

}

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

Options :

A : An exception is thrown at runtime

B : HELLO

C : Compilation error

D : null

Answer: B

EXPERTY DESIGNED 1Z0-809 PRACTICE TEST