Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 191:

  Given:

  

  What is the result?

  A. 6910 3

  B. 10126 3

  C. 3

  D. 6104 3

  Correct Answer: D

• Question 192:

  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

  Correct Answer: A

• Question 193:

  Given:

  public class X {

  }

  and

  public final class Y extends X {

  }

  What is the result of compiling these two classes?

  A. The compilation fails because there is no zero args constructor defined in class X.

  B. The compilation fails because either class X or class Y needs to implement the toString() method.

  C. The compilation fails because a final class cannot extend another class.

  D. The compilation succeeds.

  Correct Answer: B

  

• Question 194:

  Given:

  

  What is the result?

  A. 9

  B. An exception is thrown at runtime.

  C. 3

  D. 6

  Correct Answer: D

  

• Question 195:

  Which three initialization statements are correct? (Choose three.)

  A. int[][][] e = {{1,1,1},{2,2,2}};

  B. short sh = (short)'A';

  C. float x = 1f;

  D. byte b = 10; char c = b;

  E. String contact# = "(+2) (999) (232)";

  F. int x = 12_34;

  G. boolean false = (4 != 4);

  Correct Answer: BCF

  Reference: https://www.hudatutorials.com/java/basics/java-arrays/java-short-array

• Question 196:

  Given:

  

  What is the result?

  A. 4

  B. 3

  C. An exception is thrown at runtime.

  D. 5

  Correct Answer: A

  

  interface, text, application, chat or text message

• Question 197:

  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

  Correct Answer: D

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

• Question 198:

  Given:

  

  What is the result?

  A. 2-4

  B. 0-6 1-5 2-4

  C. 1-5

  D. 1-5 2-4

  E. The compilation fails due to an error in line 1.

  F. 0-6

  G. 0-6 2-4

  Correct Answer: C

  

  interface, text, application

• Question 199:

  

  Which line of code results in a compilation error?

  A. line n1

  B. line n3

  C. line n2

  D. line n4

  Correct Answer: D

• Question 200:

  Given the code fragment:

  

  What is the result?

  A. -1 : 2

  B. 2 : -1

  C. 2 : 3

  D. 3 : 0

  Correct Answer: B