Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 131:

  Given:

  

  Which loop incurs a compile time error?

  A. the loop starting line 11

  B. the loop starting line 7 C. the loop starting line 14

  D. the loop starting line 3

  Correct Answer: A

• Question 132:

  Which statement about a functional interface is true?

  A. It must be defined with the public access modifier.

  B. It must be annotated with @FunctionalInterface.

  C. It is declared with a single abstract method.

  D. It is declared with a single default method.

  E. It cannot have any private methods and static methods.

  Correct Answer: C

  Reference: https://www.geeksforgeeks.org/functional-interfaces-java/

• Question 133:

  Given the code fragment:

  

  What is the result?

  A. [Lettuce, Kale]

  B. A compilation error is thrown.

  C. [Lettuce, Kale] [Seabass, Salmon]

  D. [Kale, Lettuce] [Salmon, Seabass]

  Correct Answer: C

• Question 134:

  Given:

  

  What is the result?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: A

• Question 135:

  Given:

  

  Taking into account that the order of the elements is unpredictable, what is the output?

  A. {am=2, first=1, mismatch=1, second=2}

  B. {mismatch=2, am=2, first=1, second=1}

  C. {l=mismatch, 2=am}

  D. {mismatch=1, am=2, first=1, second=1}

  Correct Answer: D

• Question 136:

  Given:

  

  and

  

  Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

• Question 137:

  Given:

  

  Which statement is true?

  A. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.

  B. All classes from the package java.time. are loaded for the class Diary.

  C. Only LocalDate class from java.time package is loaded.

  D. Tester must import java.time.LocalDate in order to compile.

  Correct Answer: A

• Question 138:

  Which two are functional interfaces? (Choose two.)

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  Correct Answer: CE

  Reference: http://tutorials.jenkov.com/java-functional-programming/functional-interfaces.html

• Question 139:

  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

  Correct Answer: AE

• Question 140:

  Given:

  

  What is the output?

  A. Short value 25

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

  C. Byte value 25

  D. Object value 25

  Correct Answer: D