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Guide for 1Z0-819: Oracle Java

Quiz 1Z0-819: Oracle Java

Updated on 2026/09/08

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Guide for 1Z0-819: Oracle Java

Updated on 2026/09/08

Randomized | 10 Questions per Test | 20 Minutes | 70% to pass

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Question: / 10

4.6

Quiz

Question 1/101/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 1-3532183854

What is the result?

Select the answer:Select the answer

1 correct answer

nothing

It fails to compile.

A java.lang.IllegalArgumentException is thrown.

Quiz

Question 2/102/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 3-2133569340

Which two changes need to be made to make this class compile? (Choose two.)

Select multiple answer: (Choose 2)Select the answer

2 correct answers

Change Line 1 to an abstract class:public abstract class API {

Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;

Change Line 1 to a class:public class API {

Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {

Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;

The correct answers are C and E.
Why
The class in the question is trying to define a Java interface-like type with a method declaration that is not valid for a concrete class. To compile, two changes are needed:
1. Change Line 1 to a class
Option C: public class API {
If the type is declared as an interface, then the method declaration on Line 2 must follow interface rules. But the way the method is written suggests the intent is a regular class, not an interface.
2. Change Line 2 to an abstract method
Option E: public abstract void checkValue(Object value) throws IllegalArgumentException;
In a class, a method declaration without a body must be abstract. If Line 2 is currently just a method signature ending with a semicolon, it is only legal if the enclosing type is abstract. Since the correct fix is to make the type a class, the method must also be declared abstract.
Why the other options are wrong
A. Change Line 1 to an abstract class
This would allow abstract methods, but it would not fit the intended structure shown in the question if the code is meant to compile as written with the smallest valid changes. Also, if the type is already an interface, changing it to an abstract class may not match the rest of the code.
B. Change Line 2 access modifier to protected
An interface method cannot be protected. Interface methods are implicitly public, and older-style interface methods cannot be protected. So this does not solve the problem.
D. Change Line 1 to extend java.lang.AutoCloseable
This is unrelated. AutoCloseable is an interface used for resources that can be closed. Extending it does not address the method declaration issue.
Key rule to remember
- A method without a body must be abstract unless it is in an interface as a public abstract method.
- If the enclosing type is a class, then a body is required unless the method is declared abstract and the class itself is abstract.
So the two changes that make the class compile are:
C. Change Line 1 to a class
E. Change Line 2 to an abstract method

Right Answer: C, E

Quiz

Question 3/103/10

Which two modules include APIs in the Java SE Specification? (Choose two.)

Select multiple answer: (Choose 2)Select the answer

2 correct answers

java.logging

java.desktop

javafx

jdk.httpserver

jdk.jartool

Quiz

Question 4/104/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 4-1564090500

What is the output?

Select the answer:Select the answer

1 correct answer

300

Exception

200

100

Quiz

Question 5/105/10

Which two statements are true about the modular JDK? (Choose two.)

Select multiple answer: (Choose 2)Select the answer

2 correct answers

The foundational APIs of the Java SE Platform are found in the java.base module.

An application must be structured as modules in order to run on the modular JDK.

It is possible but undesirable to configure modules’ exports from the command line.

APIs are deprecated more aggressively because the JDK has been modularized.

Quiz

Question 6/106/10

Given the code fragment:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 6-3042765184

What is the result?

Select the answer:Select the answer

1 correct answer

-1 : 2

2 : -1

2 : 3

3 : 0

Quiz

Question 7/107/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 7-1662721004

What is the result?

Select the answer:Select the answer

1 correct answer

The compilation fails.

abdf

abd

adf

abcd

Quiz

Question 8/108/10

Which set of commands is necessary to create and run a custom runtime image from Java source

files?

Select the answer:Select the answer

1 correct answer

java, jdeps

javac, jlink

jar, jlink

javac, jar

Quiz

Question 9/109/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 8-3879830202

What is the result?

Select the answer:Select the answer

1 correct answer

An exception is thrown at runtime.

Quiz

Question 10/1010/10

Given:

Certification Exam 1Z0-819: Oracle Java Oracle Oracle-1Z0-819 10-2459538393

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?

Select the answer:Select the answer

1 correct answer

setLeft and setRight must be protected.

left and right must be private.

isValid must be public.

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

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Quiz name:1Z0-819: Oracle Java
Total number of questions:296
Number of questions for the test:50
Pass score:80%

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