Free Oracle 1Z0-819 Exam Questions

Become Oracle Certified with updated 1Z0-819 exam questions and correct answers

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Total 515 Questions | Updated On: Jan 04, 2026

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Question 1

Given:

It is required that if p instanceof Pair then p.isValid() returns true. Which is the smallest set of visibility changes to insure this requirement is met?

A : setLeft and setRight must be protected.

B : left and right must be private.

C : isValid must be public.

D : left, right, setLeft, and setRight must be private.

Answer: B

Question 2

Assuming the user credentials are correct, which expression will create a Connection?

A :

B :

C :

D :

E :

Answer: D

Question 3

Given:

List list1 = new ArrayList<>();

list1.add(“A”);

list1.add(“B”);

List list2 = List.copyOf(list1);

list2.add(“C”);

List> list3 = List.of(list1, list2);

System.out.println(list3);

What is the result?

A : [[A, B],[A, B]]

B : An exception is thrown at run time.

C : [[A, B], [A, B, C]]

D : [[A, B, C], [A, B, C]]

Answer: B

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 result = fruits.stream().filter(f > f.contains (''n'')).findFirst ();

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

Answer: B

Question 5

Given:

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

Which statement on line 1 enables this code fragment to compile?

A : Function function = String::toUpperCase;

B : UnaryOperator function = s > s.toUpperCase();

C : UnaryOperator function = String::toUpperCase;

D : Function function = m > m.toUpperCase();

Answer: C

Page: 1 / 103

Total 515 Questions | Updated On: Jan 04, 2026

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