Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 71:

  Given:

  

  And the code fragment:

  

  Which situation will occur on code fragment execution?

  A. Livelock

  B. Deadlock

  C. Race Condition

  D. Starvation

  Correct Answer: D

• Question 72:

  Given the Customer table structure:

  ID Number Primary Key NAME Text Nullable Given code fragment:

  

  Which statement inserted on line 14 sets NAME column to a NULL value?

  A. Stmt.setNull(2, java,sql. Types, VARCHAR);

  B. Stmt.setNull(2 string, class);

  C. Stmt.setNull(2, null);

  D. Stmt.setNull(2, java.lang, string);

  Correct Answer: A

• Question 73:

  Which describes a characteristic of setting up the Java development environment?

  A. Setting up the Java development environment requires that you also install the JRE.

  B. The Java development environment is set up for all operating systems by default.

  C. You set up the Java development environment for a specific operating system when you install the JDK.

  D. Setting up the Java development environment occurs when you install an IDE before the JDK.

  Correct Answer: D

  Reference: https://docs.oracle.com/javame/8.1/sdk-dev-guide/install.htm

• Question 74:

  Given:

  

  How many Thing objects are eligible for garbage collection in line 1?

  A. 3

  B. 2

  C. 0

  D. 1

  E. 4

  Correct Answer: D

• Question 75:

  Given the code fragment: What is the result?

  

  A. false true true

  B. true false false

  C. false false true

  D. false true false

  Correct Answer: D

  

• Question 76:

  Which two safely validate inputs? (Choose two.)

  A. Delegate numeric range checking of values to the database.

  B. Accept only valid characters and input values.

  C. Use trusted domain-specific libraries to validate inputs.

  D. Assume inputs have already been validated.

  E. Modify the input values, as needed, to pass validation.

  Correct Answer: AB

  Reference: https://stackoverflow.com/

• Question 77:

  Given:

  

  You want to calculate the average of the Player's score. Which statement inserted on line 1 will accomplish this?

  A. players.stream().average().orElse(0.0);

  B. players.stream().mapToInt(a -> a.score).average().orElse(0.0);

  C. players.stream().mapToDouble(a -> a.score).average();

  D. players.stream().map(a -> a.score).average();

  Correct Answer: B

• Question 78:

  Given:

  

  Why does this compilation fail?

  A. The method Y. print (object) does not call the method super.print (object)

  B. The method x. print (object) is not accessible to Y.

  C. In method x. print (Collection), system. Out :: prints is an invalid Java identifier.

  D. The method print (object) and the method print (object...) are duplicates of each other.

  E. The method Y. print (object...) cannot override the final method x.print (object....).

  Correct Answer: E

• Question 79:

  A bookstore's sales are represented by a list of Sale objects populated with the name of the customer and the books they purchased.

  public class Sale {

  private String customer;

  private List items;

  // constructor, setters and getters not shown

  }

  public class Book {

  private String name;

  private double price;

  // constructor, setters and getters not shown

  }

  Given a list of Sale objects, tList, which code fragment creates a list of total sales for each customer in ascending order?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

• Question 80:

  Given:

  

  What is the result?

  A. NullPointerException is thrown at line 4.

  B. NullPointerException is thrown at line 10.

  C. A compilation error occurs.

  D. Hello

  Correct Answer: C