Oracle 1Z0-819 Online Practice Questions and Exam Preparation

Oracle 1Z0-819 Online Questions & Answers

• Question 251:

  Given:

  

  and

  

  Which is the correct implementation of the getRatings method in the Football subclass?

  A. The subclass getRatings method uses public.getRatings() to call the base class method but uses its own named fields in the implementation.
  B. The subclass getRatings method implementation directly accesses the fields in the Sports superclass.
  C. The subclass getRatings method uses new.getRatings() to call the base class method but uses its own named fields in the implementation.
  D. The subclass getRatings method uses super.getRatings() to call the base class method but uses its own named fields in the implementation.
  D. The subclass getRatings method uses super.getRatings() to call the base class method but uses its own named fields in the implementation.

• Question 252:

  Given:

  List longlist = List.of("Hello","World","Beat");

  List shortlist = new ArrayList<>();

  Which code fragment correctly forms a short list of words containing the letter "e"?

  

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

• Question 253:

  Which two statements are true about a class that is marked @Deprecated? (Choose two.)

  A. Using the class will cause the Java compiler to give a warning.
  B. The class cannot be extended.
  C. The author of the class wants to discourage people from using the class in any way.
  D. There is always another class that can be used instead of the deprecated class.
  E. Using the class is guaranteed to cause errors at runtime.
  A. Using the class will cause the Java compiler to give a warning.
  C. The author of the class wants to discourage people from using the class in any way.

• Question 254:

  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
  D. public void z() { } // position 3

• Question 255:

  Given:

  

  You want to implement the java. Io, serializable interface to the MypersisteneData class. Which method should be overriden?

  A. The readExternal and writeExternal method
  B. The readExternal method
  C. The writeExternal method
  D. nothing
  A. The readExternal and writeExternal method

• Question 256:

  

  Which is true?

  A. Code compiles but throws a runtime exception when run.
  B. It prints 666.
  C. The code compiles and runs successfully but with a wrong answer (i.e., a bug).
  D. The code does not compile successfully.
  D. The code does not compile successfully.

• Question 257:

  Given: What is the result?

  

  A. b1
  B. 2
  C. b2
  D. 1
  E. b3
  F. 3
  G. The compilation fails due to an error in line 1.
  F. 3

• Question 258:

  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));
  B. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();
  D. double avg = numbers.stream().average().getAsDouble();

• Question 259:

  Given:

  LocalDate d1 = LocalDate.of(1997,2,7);

  DateTimeFormatter dtf =

  DateTimeFormatter.ofPattern( /*insert code here*/ );

  System.out.println(dtf.format (d1));

  Which pattern formats the date as Friday 7th of February 1997?

  A. "eeee dd+"th of"+ MMM yyyy"
  B. "eeee dd'th of' MMM yyyy"
  C. "eeee d+"th of"+ MMMM yyyy"
  D. "eeee d'th of' MMMM yyyy"
  D. "eeee d'th of' MMMM yyyy"

• Question 260:

  Given this enum declaration:

  

  Examine this code:

  System.out.println(Letter.values()[1]);

  What code should be written at line 5 for this code to print 200?

  A. public String toString() { return String.valueOf(ALPHA.v); }
  B. public String toString() { return String.valueOf(Letter.values()[1]); }
  C. public String toString() { return String.valueOf(v); }
  D. String toString() { return "200"; }
  C. public String toString() { return String.valueOf(v); }