Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 91:

  Given:

  

  executed using command: java Hello "Hello World" Hello World What is the output?

  A. An exception is thrown at runtime.

  B. Hello WorldHello World

  C. Hello World Hello World

  D. Hello WorldHelloWorld

  E. HelloHello WorldHelloWorld

  Correct Answer: C

• Question 92:

  Given:

  

  Assume the file on path does not exist. What is the result?

  A. The compilation fails.

  B. /u01/work/filestore.txt is not deleted.

  C. Exception

  D. /u01/work/filestore.txt is deleted.

  Correct Answer: A

  

• Question 93:

  Given:

  

  What is the result?

  A. 5

  B. 3

  C. 15

  D. 25

  E. 11

  Correct Answer: C

  ans = i+35/5-2 = 15

• Question 94:

  Which two statements are correct about modules in Java? (Choose two.)

  A. module-info.java cannot be empty

  B. module-info.java can be placed in any folder inside module-path

  C. By default, modules can access each other as long as they run in the same folder

  D. A module must be declared in module-info.java file

  E. java.base exports all of the Java platforms core packages

  Correct Answer: DE

• Question 95:

  Given:

  

  Which code fragment added to line 1 enables the code to compile and print Hello Joe?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

• Question 96:

  var numbers = List.of(0,1,2,3,4,5,6,7,8,9);

  You want to calculate the average of numbers.

  Which two codes will accomplish this? (Choose two.)

  A. double avg = numbers.stream().parallel().averagingDouble(a > a);

  B. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();

  C. double avg = numbers.stream().mapToInt (i > i).average().parallel();

  D. double avg = numbers.stream().average().getAsDouble();

  E. double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));

  Correct Answer: BD

  

• Question 97:

  Given TripleThis.java:

  

  Compiling TripleThis.java gives this compiler warning:

  Note: TripleThis.java uses unchecked or unsafe operations.

  Which two replacements done together remove this compiler warning?

  A. Replace line 12 with public static void printValue(Function f, int num) {

  B. Replace line 12 with public static void printValue(Function f, T num) {

  C. Replace line 9 with Function tripler = x --> { return (Integer) x * 3; }

  D. Replace line 12 with public static void printValue(Function f, Integer num) {

  E. Replace line 9 with Function tripler = x -> { return x * 3; }

  Correct Answer: AD

• Question 98:

  Given:

  

  Which statement on line 1 enables this code to compile?

  A. Function f = n > n * 2;

  B. Function f = n > n * 2;

  C. Function f = n > n * 2;

  D. Function f = n > n * 2;

  E. Function f = n > n * 2;

  Correct Answer: A

  

• Question 99:

  A company has an existing sales application using a Java 8 jar file containing packages:

  com.company.customer;

  com.company.customer.orders;

  com.company.customer.info;

  com.company.sales;

  com.company.sales.leads;

  com.company.sales.closed;

  com.company.orders;

  com.company.orders.pending;

  com.company.orders.shipped.

  To modularize this jar file into three modules, customer, sales, and orders, which module- info.java would be correct?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

  Reference: https://developer.ibm.com/tutorials/java-modularity-3/

• Question 100:

  You replace the code on line 1 to use ParallelStream.

  

  Which one is correct?

  A. The code will produce the same result.

  B. The compilation fails.

  C. A NoSuchElementException is thrown at run time.

  D. The code may produce a different result.

  Correct Answer: D