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: Dec 16, 2025

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Question 1

Given this enum declaration:

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

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

Question 2

Given:

What is the result?

A : is it 1

B : An IndexOutOfBoundsException is thrown at runtime.

C : is it 0

D : this is it 2

E : this is it 3 222

Answer: D

Question 3

Given:

Which statement on line 1 enables this code to compile?

A : Function f = n > n * 2;

B : Function f = n > n * 2;

C : Function f = n > n * 2;

D : Function f = n > n * 2;

E : Function f = n > n * 2;

Answer: A

Question 4

Given:

Which is true about line 1?

A : If the value is not present, a NoSuchElementException is thrown at run time.

B : It always executes the System.out::print statement.

C : If the value is not present, a NullPointerException is thrown at run time.

D : If the value is not present, nothing is done.

Answer: D

Question 5

Given:

This code results in a compilation error. Which code should be inserted on line 1 for a successful compilation?

A : Consumer consumer = msg -> { return System.out.print(msg); };

B : Consumer consumer = var arg #> {System.out.print(arg);};

C : Consumer consumer = (String args) #> System.out.print(args);

D : Consumer consumer = System.out::print;

Answer: D

Page: 1 / 103

Total 515 Questions | Updated On: Dec 16, 2025

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