Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 281:

  Given:

  

  What action ensures successful compilation?

  A. Replace public Color(int c) with private Color(int c).
  B. Replace int c; with private int c;.
  C. Replace int c; with private final int c;.
  D. Replace enum Color implements Serializable with public enum Color.
  E. Replace enum Color with public enum Color.
  A. Replace public Color(int c) with private Color(int c).

• Question 282:

  Given the code fragment:

  

  You want to examine whether path is a directory.

  Which code inserted on line 1 will accomplish this?

  A. BasicFileAttributes attributes = Files isDirectory (path);
  B. BasicFileAttributes attributes =Files.getAttribute (path, `'insdirectory'');
  C. BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class
  D. BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);
  D. BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);

• Question 283:

  Given:

  

  Which annotation should be used to remove warnings from compilation?

  A. @SuppressWarnings on the main and print methods
  B. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method
  C. @SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method
  D. @SuppressWarnings("all") on the main and print methods
  B. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method

• Question 284:

  Which is a valid statement?

  A. BiPredicate testEquality = (var x, Integer y) -> (x.equals(y));
  B. BiPredicate testEquality = (var x, var y) -> (x.equals(y));
  C. BiPredicate testEquality = var x, var y -> (x.equals(y));
  D. BiPredicate testEquality = (var x, y) -> (x.equals(y));
  B. BiPredicate testEquality = (var x, var y) -> (x.equals(y));

• Question 285:

  Given:

  

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

  A. Change Line 1 to a class: public class API {
  B. hange Line 2 to an abstract method: public abstract void checkValue(Object value) throws IllegalArgumentException;
  C. hange Line 2 access modifier to protected: protected void checkValue(Object value) throws IllegalArgumentException;
  D. Change Line 1 to extend java.lang.AutoCloseable: public interface API extends AutoCloseable {
  E. Change Line 1 to an abstract class: public abstract class API {
  B. hange Line 2 to an abstract method: public abstract void checkValue(Object value) throws IllegalArgumentException;
  E. Change Line 1 to an abstract class: public abstract class API {

• Question 286:

  Given the code fragment:

  

  Which statement at line 1 will print Ping Pong?

  

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

• Question 287:

  Given:

  

  You wants to make the reduction operation parallelized. Which two modifications will accomplish this?

  A. Replace line 1 with int sum = numbers.stream() .flatMap(a -> a).reduce (0, (n, m) -> n + m);.
  B. Replace line 1 with int sum = numbers.stream().iterate (0, a -> a+1).reduce (0, (n, m) -> n + m)
  C. Replace line 1 with int sum = numbers.parallel ().stream().reduce(0, (n, m) -> n + m)
  D. Replace line 1 with int sum = numbers.parallelStream().reduce (0, (n, m) -> n + m);.
  E. Replace line 1 with int sum = numbers.stream().parallel().reduce(0, (n, m) -> n + m)
  D. Replace line 1 with int sum = numbers.parallelStream().reduce (0, (n, m) -> n + m);.
  E. Replace line 1 with int sum = numbers.stream().parallel().reduce(0, (n, m) -> n + m)

• Question 288:

  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();
  D. .filter(Employee::getLocality) .distinct() .count();

• Question 289:

  Given:

  

  What is the result?

  A. NullPointerException is thrown at line 4.
  B. NullPointerException is thrown at line 10.
  C. A compilation error occurs.
  D. Hello
  C. A compilation error occurs.

• Question 290:

  Given:

  

  What is the result?

  A. The compilation fails.
  B. An unchecked exception is thrown at run time.
  C. Error reading files is printed on the console.
  D. The content from filel.txt and file2.txt is printed on the console.
  A. The compilation fails.