Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 261:

  Given:

  

  and the code fragment:

  

  You want to examine the items list if it contains an item for which the variable count is below zero. Which code fragment at line 1 will accomplish this?

  A. if(items.stream().allMatch(i -> i.count < 0)) {

  B. if(items.stream().anyMatch(i -> i.count < 0)) {

  C. if(items.stream().filter(i -> i.count < 0).findAny()) {

  D. if(items.stream().filter(i -> i.count < 0).findFirst()) {

  Correct Answer: B

• Question 262:

  Given:

  

  and

  

  What is the result?

  A. ADBC

  B. ACB

  C. ACBD

  D. ACD

  E. ACDB

  Correct Answer: C

• Question 263:

  Given: What is the output?

  

  A. 30

  B. 35

  C. 41

  D. 46

  Correct Answer: A

• Question 264:

  Given the code fragment:

  

  What is the result?

  A. 2 4 6 8

  B. 2 4 6 8 10

  C. 1 3 5 7 9 11

  D. 1 3 5 7 9

  Correct Answer: A

• Question 265:

  Given the code fragment from Box.java:

  

  Given the code fragment from Item.java:

  

  Given the information:

  1.

  The classes Box and Item are encapsulated with getters and setters methods.

  2.

  The classes Box and Item contains required constructors source code. and the code fragment:

  

  Which action serializes the b1 object?

  A. Handle NotSerializableException in the try clause or throw in the main() method definition.

  B. Add SerialVersionUID to the Box and Item class.

  C. Implement the Serializable interface in the Item class.

  D. Override readObject() and writeObject() methods in the Book class.

  E. Remove out.flush() method invocation.

  Correct Answer: C

• Question 266:

  Given: Which is true?

  

  A. The program fails to compile on line 10.

  B. The program fails to compile on line 13.

  C. The program fails to compile on line 11.

  D. The program compiles fine.

  Correct Answer: B

• Question 267:

  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));

  Correct Answer: B

• Question 268:

  Given:

  class Animal { }

  class Dog extends Animal { }

  class Petdog extends Dog { }

  and

  

  Which two statements inserted independently on line 3 will make this code compile? (Choose two.)

  A. return new House();

  B. return new House();

  C. return new House();

  D. return new House();

  E. return new House();

  Correct Answer: BC

• Question 269:

  Given:

  

  and the command:

  java ConsoleTest

  The user will input Duke and Java when the input is prompted.

  What is the output?

  A. Input Name: Duke Input Password: Name is: Duke, Password is: Java

  B. Input Name: Duke Input Password: Java Name is: Duke, Password is: Java

  C. Input Name: Duke Input Password: Name is: Duke, Password is:

  D. Input Name: Duke Input Password: Java Name is: Duke, Password is: [C@4f6ee6e4

  Correct Answer: D

• Question 270:

  Given the code fragment:

  Supplier supplier = () -> "Hello World": // line 1

  Which statement on line 1 is calling the method of the supplier object correctly?

  A. System.out.println(supplier.apply())

  B. System.out.println(supplier.accept());

  C. System.out.println(supplier.get());

  D. System.out.println(supplier.test());

  Correct Answer: C