Online 1Z0-809 Practice Test

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?

Options :

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

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.)

Options :

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

Untitled1-page69-image65

What is the result?

Options :

A :

A compilation error occurs at line 7.

B : 100

C : A compilation error occurs at line 8.

D : A compilation error occurs at line 15.

Answer: A

Question 4

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. public class Test {

4. private static void div(int i, int j) {

5. try {

6. System.out.println(i / j);

7. } catch(ArithmeticException e) {

8. throw (RuntimeException)e;

9. }

10. }

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

12. try {

13. div(5, 0);

14. } catch(ArithmeticException e) {

15. System.out.println("AE");

16. } catch(RuntimeException e) {

17. System.out.println("RE");

18. }

19. }

20. }

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

Options :

A : AE

B : RE

C : Compilation error

D : Program ends abruptly

Answer: A

Question 5

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 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 Exception.

D : compilation fails on line 13.

Answer: C

EXPERTY DESIGNED 1Z0-809 PRACTICE TEST