Online 1Z0-809 Practice Test

Question 1

Given code of Test.java file:

1. package com.udayan.ocp;

2.

3. import java.util.stream.Stream;

4.

5. public class Test {

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

7. Stream stream = Stream.of("d", "cc", "bbb", "aaaa");

8. stream.sorted().forEach(System.out::println);

9. }

10. }

Which of the following needs to be done, so that output is:

d

cc

bbb

aaaa

Options :

A : No need to make any changes, on execution given code prints expected result

B : Replace stream.sorted() with stream.sorted((s1,s2) -> s1.length() - s2.length())

C : Replace stream.sorted() with stream.sorted((s1,s2) -> s2.length() - s1.length())

Answer: B

Question 2

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 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. 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 4

Given:

class FuelNotAvailException extends Exception { }

class Vehicle {

void ride() throws FuelNotAvailException { //line n1

System.out.println(“Happy Journey!”);

}

class SolarVehicle extends Vehicle {

public void ride () throws Exception { //line n2

super ride ();

}

and the code fragment:

public static void main (String[] args) throws FuelNotAvailException, Exception

{

Vehicle v = new SolarVehicle ();

v.ride();

}

Which modification enables the code fragment to print Happy Journey!?

Options :

A : Replace line n1 with public void ride() throws FuelNotAvailException {

B :

Replace line n1 with protected void ride() throws Exception {

C : Replace line n2 with void ride() throws Exception {

D : Replace line n2 with private void ride() throws FuelNotAvailException {

Answer: B

Question 5

Given the code fragment:

List<String> colors = Arrays.asList(“red”, “green”, “yellow”);

Predicate<String> test = n - > {

System.out.println(“Searching…”);

return n.contains(“red”);

};

colors.stream()

.filter(c -> c.length() >= 3)

.allMatch(test);

What is the result?

Options :

A :

Searching…

B :

Searching…

C :

Searching…

D :

A compilation error occurs.

Answer: C

EXPERTY DESIGNED 1Z0-809 PRACTICE TEST