All About Actual 1Z0-819 Answers

NEW QUESTION 1
Given:

Which two lines inserted in line 1 will allow this code to compile? (Choose two.)

• A. protected void walk(){}
• B. void walk(){}
• C. abstract void walk();
• D. private void walk(){}
• E. public abstract void walk();

Answer: AE

NEW QUESTION 2
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 3
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 4
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 5
Given:

Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)

• A. setCCount(c) = cCount;
• B. tCount = tCount;
• C. setGCount(g);
• D. cCount = setCCount(c);
• E. aCount = a;

Answer: BE

NEW QUESTION 6
Given:

When run and all three files exist, what is the state of each reader on Line 1?

• A. All three readers are still open.
• B. All three readers have been closed.
• C. The compilation fails.
• D. Only reader1 has been closed.

Answer: C

NEW QUESTION 7
Given:

Which code, when inserted at one or more marked positions, would allow classes B and C to compile?

• A. @Override // position 3void x () {} // position 3@Override // position 3public void z() { } // position 3
• B. @Override // position 2public void z() { } // position 3
• C. implements A // position 1@Override // position 2
• D. public void z() { } // position 3

Answer: B

NEW QUESTION 8
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: BD

Explanation:

NEW QUESTION 9
Given:

What is the result?

• A. 42
• B. The compilation fails due to an error in line 4.
• C. 17
• D. The compilation fails due to an error in line 3.
• E. The compilation fails due to an error in line 2.
• F. The compilation fails due to an error in line 1.
• G. The compilation fails due to an error in line 5.

Answer: A

NEW QUESTION 10
Given:

Which is true?

• A. System.out is the standard output strea
• B. The stream is open only when System.out is called.
• C. System.in cannot reassign the other stream.
• D. System.out is an instance of java.io.OutputStream by default.
• E. System.in is the standard input strea
• F. The stream is already open.

Answer: D

NEW QUESTION 11
Which statement about access modifiers is correct?

• A. An instance variable can be declared with the static modifier.
• B. A local variable can be declared with the final modifier.
• C. An abstract method can be declared with the private modifier.
• D. An inner class cannot be declared with the public modifier.
• E. An interface can be declared with the protected modifier.

Answer: B

NEW QUESTION 12
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

NEW QUESTION 13
Given:

What is the expected result of javac?

• A. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: packagejava does not exist
• B. javac compiles Mycar.java without errors or warnings.
• C. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: expected import java.lang
• D. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class

Answer: B

NEW QUESTION 14
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

Answer: D

Explanation:

NEW QUESTION 15
Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

• A. Locale.setDefault(Locale.Category.FORMAT, “zh-CN”);
• B. Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);
• C. Locale.setDefault(Locale.SIMPLIFIED_CHINESE);
• D. Locale.setDefault(“en_CA”);
• E. Locale.setDefault(“es”, Locale.US);

Answer: BD

NEW QUESTION 16
Given:

Which two method implementations are correct, when inserted independently in line 1? (Choose two.)

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

Answer: AE

NEW QUESTION 17
Which three annotation uses are valid? (Choose three.)

• A. Function<String, String> func = (@NonNull x) > x.toUpperCase();
• B. var v = “Hello” + (@Interned) “World”
• C. Function<String, String> func = (var @NonNull x) > x.toUpperCase();
• D. Function<String, String> func = (@NonNull var x) > x.toUpperCase();
• E. var myString = (@NonNull String) str;
• F. var obj = new @Interned MyObject();

Answer: ACF

NEW QUESTION 18
Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

• A. .map(Employee::getLocality).distinct().count();
• B. map(e > e.getLocality()).count();
• C. .map(e > e.getLocality()).collect(Collectors.toSet()).count();
• D. .filter(Employee::getLocality).distinct().count();

Answer: D

NEW QUESTION 19
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 20
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