Online 1Z0-809 Practice Test

Question 1

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. 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?

Options :

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

Given:

and the code fragment:

Which two code fragments, when inserted at line n1 independently, enable the code to print

TruckCarBike?

Options :

A : .sorted ((v1, v2) -> v1.getVId() < v2.getVId())

B : .sorted (Comparable.comparing (Vehicle: :getVName)).reversed ()

C :

.map (v -> v.getVid())

.sorted ()

D : .sorted((v1, v2) -> Integer.compare(v1.getVId(), v2.getVid()))

E : .sorted(Comparator.comparing ((Vehicle v) -> v.getVId()))

Answer: A,D

Question 3

Given:

From what threading problem does the program suffer?

Options :

A : race condition

B : deadlock

C : starvation

D : livelock

Answer: B

Question 4

Given:

public class Counter {

public static void main (String[ ] args) {

int a = 10;

int b = -1;

assert (b >=1) : “Invalid Denominator”;

int с = a / b;

System.out.println (c);

}

What is the result of running the code with the –da option?

Options :

A : -10

B : 0

C : An AssertionError is thrown.

D : A compilation error occurs.

Answer: A

Question 5

Given the code fragment:

List<String> empDetails = Arrays.asList(“100, Robin, HR”,

“200, Mary, AdminServices”,

“101, Peter, HR”);

empDetails.stream()

.filter(s-> s.contains(“1”))

.sorted()

.forEach(System.out::println); //line n1

What is the result?

Options :

A : 100, Robin, HR 101, Peter, HR

B : A compilation error occurs at line n1.

C :

100, Robin, HR

101, Peter, HR

200, Mary, AdminServices

D :

100, Robin, HR

200, Mary, AdminServices

101, Peter, HR

Answer: A

EXPERTY DESIGNED 1Z0-809 PRACTICE TEST