Oracle 1Z0-816 Online Practice Questions and Exam Preparation

Oracle 1Z0-816 Online Questions & Answers

• Question 61:

  Given:

  

  Examine these requirements:

  Eliminate code duplication.

  Keep constant the number of methods other classes may implement from this interface.

  Which method can be added to meet these requirements?

  

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

• Question 62:

  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
  D. java.util.concurrent.Callable

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  Reference: https://www.codota.com/code/java/methods/java.util.concurrent.Executors/newFixedThreadPool

• Question 63:

  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.
  A. Interfaces cannot have protected methods but abstract classes can.
  C. Interfaces cannot have instance fields but abstract classes can.

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  Reference: https://www.guru99.com/interface-vs-abstract-class-java.html

• Question 64:

  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
  C. Option C

• Question 65:

  Given: Which two are correct? (Choose two.)

  

  A. The output will be exactly 2 1 3 4 5.
  B. The program prints 1 4 2 3, but the order is unpredictable.
  C. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5, but the order is unpredictable.
  D. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.
  E. Replacing forEach() with forEachOrdered(), the program prints 2 1 3 4 5.
  B. The program prints 1 4 2 3, but the order is unpredictable.
  D. Replacing forEach() with forEachOrdered(), the program prints 1 2 3 4 5.

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• Question 66:

  Given:

  

  After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

  A. after line 8
  B. after line 6
  C. after line 5
  D. after line 10
  B. after line 6

• Question 67:

  Which two are successful examples of autoboxing? (Choose two.)

  A. String a = "A";
  B. Integer e = 5;
  C. Float g = Float.valueOf(null);
  D. Double d = 4;
  E. Long c = 23L;
  F. Float f = 6.0;
  A. String a = "A";
  B. Integer e = 5;

• Question 68:

  Given:

  

  What is the result?

  A. Orange Juice
  B. The compilation fails.
  C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
  D. The program prints nothing.
  C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart

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• Question 69:

  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).

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• Question 70:

  Given the Person class with age and name along with getter and setter methods, and this code fragment:

  

  What will be the result?

  A. Aman Tom Peter
  B. Tom Aman Peter
  C. Aman Peter Tom
  D. Tom Peter Aman
  C. Aman Peter Tom