Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 301:

  Given:

  

  Given the directory structure:

  

  Given the commands to execute at the Test directory prompt:

  

  Which statement is true?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

• Question 302:

  Given:

  

  and

  

  What is the result?

  A. 214

  B. 2341

  C. 234

  D. 2134

  Correct Answer: C

• Question 303:

  Given TripleThis.java:

  

  Compiling TripleThis.java gives this compiler warning:

  Note: TripleThis.java uses unchecked or unsafe operations.

  Which two replacements remove this compiler warning and prints 12? (Choose two.)

  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; }

  F. Replace line 9 with Function tripler = x -> [ return x * 3; ]

  Correct Answer: AD

• Question 304:

  Given the code fragment:

  

  Which statement prints the same value of result? (Choose two.)

  A. System.out.printIn(IntStream.range(0, 99).count());

  B. System.out.printIn(IntStream.rangeClosed(1, 100).count());

  C. System.out.printIn(IntStream.range(1, 100).count());

  D. System.out.printIn(IntStream.rangeClosed(0, 100).map(x -> x).count());

  Correct Answer: B

• Question 305:

  Given:

  

  and

  

  Why does this compilation fail?

  A. The method X.print (object) is not accessible to Y.

  B. The method Y.print (Object) does not call the method super.print (Object).

  C. In method X.print (Collection), System.out::println is an invalid Java identifier.

  D. The method Y.print (Object...) cannot override the final method X.print (Object...).

  E. The method print (Object) and the method print (Object...) are duplicates of each other.

  Correct Answer: D

• Question 306:

  Given:

  

  and

  

  Which statement is true?

  A. The memory allocated for Jack object can be reused in line 2.

  B. The memory allocated for Jane object can be reused in line 1.

  C. The memory allocated for Jane object can be reused in line 2.

  D. The memory allocated for John object can be reused in line 1.

  Correct Answer: D

• Question 307:

  Assuming the user credentials are correct, which expression will create a Connection?

  A. DriverManager.getConnection("http://database.jdbc.com", "J_SMITH", "dt12%2f3")

  B. DriverManager.getConnection("jdbc:derby:com")

  C. DriverManager.getConnection("jdbc.derby.com")

  D. DriverManager.getConnection()

  E. DriverManager.getConnection("J_SMITH", "dt12%2f3")

  Correct Answer: B

• Question 308:

  Given:

  

  Which makes class A thread safe?

  A. Class A is thread safe.

  B. Make foo and setB synchronized.

  C. Make foo synchronized.

  D. Make A synchronized.

  E. Make setB synchronized.

  Correct Answer: B

• Question 309:

  Given:

  

  and

  

  and

  

  What is the result?

  A. The compilation fails on line 2.

  B. ab action

  C. An exception is thrown at run time.

  D. a action

  E. The compilation fails on line 1.

  Correct Answer: B

• Question 310:

  Given the code fragment:

  Integer i = 11;

  Which two statements compile? (Choose two.)

  A. Double c = (Double) i;

  B. Double b = Double.valueOf(i);

  C. Double a = i;

  D. double e = Double.parseDouble(i);

  E. double d = i;

  Correct Answer: BE