Oracle 1Z0-819 Free Practice Questions

NEW QUESTION 1
Given:

Which three are true? (Choose three.)

• A. b1.foo(c) prints Bonjour le monde!
• B. f1.foo(c) prints Hello world!
• C. f1.foo(c) prints Olá Mundo!
• D. b1.foo(c) prints Hello world!
• E. f2.foo(c) prints Olá Mundo!
• F. b1.foo(c) prints Olá Mundo!
• G. f2.foo(c) prints Bonjour le monde!
• H. f2.foo(c) prints Hello world!
• I. f1.foo(c) prints Bonjour le monde!

Answer: BFG

NEW QUESTION 2
Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

• A. Interfaces cannot have protected methods but abstract classes can.
• B. Both interfaces and abstract classes can have final methods.
• C. Interfaces cannot have instance fields but abstract classes can.
• D. Interfaces cannot have static methods but abstract classes can.
• E. Interfaces cannot have methods with bodies but abstract classes can.

Answer: AC

NEW QUESTION 3
Given:

executed with this command: java Main one two three
What is the output of this class?

• A. The compilation fails.
• B. 1) one2) two3) three
• C. A java.lang.ArrayIndexOutOfBoundsException is thrown.
• D. 1) one
• E. nothing

Answer: B

NEW QUESTION 4
Given the code fragment:
Path source = Paths.get(“/repo/a/a.txt”); Path destination = Paths.get(“/repo”); Files.move(source, destination); // line 1 Files.delete (source); // line 2
Assuming the source file and destination folder exist, what Is the result?

• A. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
• B. A java.nio.file.NoSuchFileException is thrown on line 2.
• C. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
• D. a.txt is renamed repo.

Answer: C

NEW QUESTION 5
Which three initialization statements are correct? (Choose three.)

• A. int x = 12_34;
• B. short sh = (short)‘A’;
• C. String contact# = “(+2) (999) (232)”;
• D. boolean true = (4 == 4);
• E. float x = 1.99;
• F. int[][] e = {{1,1},{2,2}};
• G. byte b = 10;char c = b;

Answer: ABF

NEW QUESTION 6
Given the contents:
MessageBundle.properties file: message=Hello MessageBundle_en.properties file: message=Hello (en) MessageBundle_US.properties file: message=Hello (US) MessageBundle_en_US.properties file: message=Hello (en_US) MessageBundle_fr_FR.properties file: message=Bonjour
and the code fragment: Locale.setDefault(Locale.FRANCE);
Locale currentLocale = new Locale.Builder().setLanguage(“en”).build();
ResourceBundle messages = ResourceBundle.getBundle(“MessageBundle”, currentLocale); System.out. println(messages.getString(“message”));
Which file will display the content on executing the code fragment?

• A. MessageBundle_en_US.properties
• B. MessageBundle_en.properties
• C. MessageBundle_fr_FR.properties
• D. MessageBundle_US.properties
• E. MessageBundle.properties

Answer: C

NEW QUESTION 7
Given an application with a main module that has this module-info.java file:

Which two are true? (Choose two.)

• A. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
• B. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
• C. An implementation of country.countryDetails can be added to the main module.
• D. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
• E. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.

Answer: BD

NEW QUESTION 8
Which code fragment compiles?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: D

Explanation:

NEW QUESTION 9
Given:

You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?

• A. Extend AutoCloseable and override the close method.
• B. Implement AutoCloseable and override the autoClose method.
• C. Extend AutoCloseable and override the autoClose method.
• D. Implement AutoCloseable and override the close method.

Answer: D

NEW QUESTION 10
Given:

Which one is correct?

• A. An IllegalThreadStateException is thrown at run time.
• B. Three threads are created.
• C. The compilation fails.
• D. Four threads are created.

Answer: A

Explanation:

NEW QUESTION 11
Given:

If file "App.config" is not found, what is the result?

• A. Configuration is OK
• B. The compilation fails.
• C. Exception in thread "main" java.lang.Error:Fatal Error: Configuration File, App.config, is missing.
• D. nothing

Answer: B

Explanation:

NEW QUESTION 12
Given:

Which statement is true about the Fox class?

• A. Fox class does not have to override inhabit method, so long as it does not try to call it.
• B. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
• C. Fox class must implement either Forest or Town interfaces, but not both.
• D. The inhabit method implementation from the first interface that Fox implements will take precedence.
• E. Fox class must provide implementation for the inhabit method.

Answer: B

NEW QUESTION 13
Given:

Which three classes successfully override printOne()? (Choose three.)

• A. Option A
• B. Option B
• C. Option C
• D. Option D
• E. Option E
• F. Option F

Answer: ACD

NEW QUESTION 14
Assuming the Widget class has a getPrice method, this code does not compile:

Which two statements, independently, would allow this code to compile? (Choose two.)

• A. Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).
• B. Replace line 1 with List widgetStream = widgets.stream();.
• C. Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).
• D. Replace line 4 with Stream widgetStream = widgets.stream();.

Answer: AD

NEW QUESTION 15
Given the code fragment:
var pool = Executors.newFixedThreadPool(5);
Future outcome = pool.submit(() > 1);
Which type of lambda expression is passed into submit()?

• A. java.lang.Runnable
• B. java.util.function.Predicate
• C. java.util.function.Function
• D. java.util.concurrent.Callable

Answer: D

NEW QUESTION 16
Given:

What is the result?

• A. Good Morning, Potter
• B. Good Night, Potter
• C. Good Morning, Harry
• D. Good Night, Harry

Answer: B

Explanation:

NEW QUESTION 17
Given:

What is the result?

• A. The compilation fails at line 9.
• B. The compilation fails at line 2.
• C. Hello World
• D. The compilation fails at line 8.

Answer: C

Explanation:

NEW QUESTION 18
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