1Z0-819 Practice Online

Question 1

var numbers = List.of(0,1,2,3,4,5,6,7,8,9);

You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

A : double avg = numbers.stream().parallel().averagingDouble(a > a);

B : double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();

C : double avg = numbers.stream().mapToInt (i > i).average().parallel();

D : double avg = numbers.stream().average().getAsDouble();

E : double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));

Answer: B,D

Question 2

Given:

Which annotation should be used to remove warnings from compilation?

A : @SuppressWarnings on the main and print methods

B : @SuppressWarnings(''unchecked'') on main and @SafeVarargs on the print method

C : @SuppressWarnings(''rawtypes'') on main and @SafeVarargs on the print method

D : @SuppressWarnings(''all'') on the main and print methods

Answer: B

Question 3

Given:

You want to calculate the average of the Player’s score.

Which statement inserted on line 1 will accomplish this?

A : players.stream().average().orElse(0.0);

B : players.stream().mapToInt(a -> a.score).average().orElse(0.0);

C : players.stream().mapToDouble(a -> a.score).average();

D : players.stream().map(a -> a.score).average();

Answer: B

Question 4

Given:

2021-04-27-22-23-17-3d4ddcb379cef75d65c8f83ed91c42db

What is the output?

A : 300

B : Exception

C : 200

D : 100

Answer: A

Question 5

Given this enum declaration:

Examine this code:

System.out.println(Alphabet.getFirstLetter());

What code should be written at line 3 to make this code print A?

A : final String getFirstLetter() { return A.toString(); }

B : static String getFirstLetter() { return Alphabet.values()[1].toString(); }

C : static String getFirstLetter() { return A.toString(); }

D : String getFirstLetter() { return A.toString(); }

Answer: C

Name:	Java SE 11 Developer
Exam Code:	1Z0-819
Certification:	OPN Certified Specialist
Vendor:	Oracle
Total Questions:	263
Last Updated:	Apr 25, 2024

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