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: Oct 29, 2025

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Question 1

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 2

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 3

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 4

Analyze the code:

Which two options can you insert inside println method to produce Global:namescope? (Choose two.)

A : Test.prefix+Test.name

B : new Test().prefix+new Test().name

C : Test.prefix+Test.getName()

D : Test.getName+prefix

E : prefix+Test.name

F : prefix+name

Answer: B,C

Question 5

Which two statements are true about a class that is marked @Deprecated?

A : There Is always another class that can be used Instead of the deprecated class.

B : Using the class will cause the Java compiler to give a warning.

C : The class cannot be extended.

D : The author of the class wants to discourage people from using the class in any way.

E : Using the class Is guaranteed to cause errors at runtime.

Answer: B,D

Page: 1 / 103

Total 515 Questions | Updated On: Oct 29, 2025

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