Practice 1Z0-819 Exam Online

Question 1

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 2

Which statement about access modifiers is correct?

A : An instance variable can be declared with the static modifier.

B : A local variable can be declared with the final modifier.

C : An abstract method can be declared with the private modifier.

D : An inner class cannot be declared with the public modifier.

E : An interface can be declared with the protected modifier.

Answer: B

Question 3

Given the code fragment:

What is the result?

A : ab cd ef

B : An ArrayIndexOutOfBoundsException is thrown at runtime.

C : The compilation fails.

D : abc def

E : ad be cf

Answer: A

Question 4

Given:

var fruits = List.of(''apple'', ''orange'', ''banana'', ''lemon'');

You want to examine the first element that contains the character n. Which statement will accomplish this?

A : String result = fruits.stream().filter(f > f.contains(''n'')).findAny();

B : fruits.stream().filter(f > f.contains(''n'')).forEachOrdered(System.out::print);

C : Optional<String> result = fruits.stream().filter(f > f.contains (''n'')).findFirst ();

D : Optional<String> result = fruits.stream().anyMatch(f > f.contains(''n''));

Answer: B

Question 5

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

Oracle 1Z0-819