Oracle Oracle Certifications 1Z0-816 Questions & Answers

• Question 61:

  You are working on a functional bug in a tool used by your development organization. In your investigation, you find that the tool is executed with a security policy file containing this grant.

  

  What action should you take?

  A. Nothing, because it is an internal tool and not exposed to the public.

  B. Remove the grant because it is excessive.

  C. Nothing, because it is not related to the bug you are investigating.

  D. File a security bug against the tool referencing the excessive permission granted.

  E. Nothing, because listing just the required permissions would be an ongoing maintenance challenge.

  Correct Answer: D

  Reference: https://wiki.sei.cmu.edu/confluence/display/java/ENV03-J.+Do+not+grant+dangerous +combinations+of+permissions

• Question 62:

  Examine these module declarations:

  

  Which two statements are correct? (Choose two.)

  A. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.

  B. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install

  multiple provider modules.

  C. The Consumer module should require the ServiceProvider module.

  D. The ServiceProvider module should export the com.myimpl package.

  E. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the com.example.api API.

  Correct Answer: AC

• Question 63:

  Given:

  

  What is the output?

  A. null

  B. A NoSuchElementException is thrown at run time.

  C. Duke

  D. A NullPointerException is thrown at run time.

  Correct Answer: C

  

• Question 64:

  Given:

  

  What is the result?

  A. The compilation fails at line 9.

  B. The compilation fails at line 2.

  C. Hello World

  D. The compilation fails at line 8.

  Correct Answer: C

• Question 65:

  

  Assume ds is a DataSource and the EMP table is defined appropriately.

  

  What does executing this code fragment do?

  A. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)

  B. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')

  C. inserts one row (101, 'SMITH', 'HR')

  D. throws a SQLException

  Correct Answer: C

• Question 66:

  Assuming the Widget class has a getPrice method, this code does not compile:

  

  Which two statements, independently, would allow this code to compile? (Choose two.)

  A. Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).

  B. Replace line 1 with List widgetStream = widgets.stream();.

  C. Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).

  D. Replace line 4 with Stream widgetStream = widgets.stream();.

  Correct Answer: AD

• Question 67:

  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 68:

  Given:

  var fruits = List.of("apple", "orange", "banana", "lemon");

  You want to examine the first element that contains the character n.

  Which statement will accomplish this?

  A. String result = fruits.stream().filter(f -> f.contains("n")).findAny();

  B. fruits.stream().filter(f -> f.contains("n")).forEachOrdered(System.out::print);

  C. Optional result = fruits.stream().filter(f -> f.contains("n")).findFirst ();

  D. Optional result = fruits.stream().anyMatch(f -> f.contains("n"));

  Correct Answer: B

  

• Question 69:

  Given:

  

  What is required to make the Foo class thread safe?

  A. No change is required.

  B. Make the declaration of lock static.

  C. Replace the lock constructor call with new ReentrantLock (true).

  D. Move the declaration of lock inside the foo method.

  Correct Answer: C

  Reference: https://stackoverflow.com/questions/55134811/how-to-make-java-class-thread-safe

• Question 70:

  Given:

  var data = new ArrayList<>();

  data.add("Peter");

  data.add(30);

  data.add("Market Road");

  data.set(1, 25);

  data.remove(2);

  data.set(3, 1000L);

  System.out.print(data);

  What is the output?

  A. [Market Road, 1000]

  B. [Peter, 30, Market Road]

  C. [Peter, 25, null, 1000]

  D. An exception is thrown at run time.

  Correct Answer: D