Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 281:

  Given the code fragment:

  

  You want to validate a path name before the read file. Before validation, all path names should be canonicalized. Which code inserted on line n1 will accomplish this?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

• Question 282:

  Given:

  

  What is the result?

  A. The compilation fails.

  B. An unchecked exception is thrown at run time.

  C. Error reading files is printed on the console.

  D. The content from filel.txt and file2.txt is printed on the console.

  Correct Answer: A

• Question 283:

  Given: What is the output?

  

  A. 2.0

  B. 2

  C. The compilation fails.

  D. An exception is thrown at runtime.

  Correct Answer: C

• Question 284:

  Given:

  

  and

  

  Which is the correct implementation of the getRatings method in the Football subclass?

  A. The subclass getRatings method uses public.getRatings() to call the base class method but uses its own named fields in the implementation.

  B. The subclass getRatings method implementation directly accesses the fields in the Sports superclass.

  C. The subclass getRatings method uses new.getRatings() to call the base class method but uses its own named fields in the implementation.

  D. The subclass getRatings method uses super.getRatings() to call the base class method but uses its own named fields in the implementation.

  Correct Answer: D

• Question 285:

  Given:

  

  Which statement on line 1 enables this code to compile?

  A. Supplier function = () -> states.contains("N");

  B. Function function = s -> s.contains(`N");

  C. Consumer function = s -> {if(s.contains("N")) states.remove(s);};

  D. Predicate function = s -> s.contains("N");

  Correct Answer: D

• Question 286:

  Given: Which is true?

  

  A. Line 2 is the first line to cause a compilation error.

  B. Line 3 is the first line to cause a compilation error.

  C. It compiles without errors.

  D. Line 1 is the first line to cause a compilation error.

  Correct Answer: C

• Question 287:

  Given the code fragment:

  

  What is the output?

  A. null

  B. 41 def 42

  C. An exception is thrown at runtime.

  D. def 42

  Correct Answer: C

• Question 288:

  Given:

  

  What is the result?

  A. The program prints nothing.

  B. The program prints: 12 and the RuntimeException is thrown.

  C. The program prints: 123 and the RuntimeException is thrown.

  D. The program prints 1234 and a java.lang.IllegalStateException is thrown.

  Correct Answer: A

• Question 289:

  Given the code fragment:

  

  Which two code fragments, independently, replace line 1 to implement the equivalent reduce operation? (Choose two.)

  A. Integer sum = data.map(a -> a).reduce((a, b) -> a+b);

  B. OptionalInt value = data.mapToInt(a -> a).parallel().reduce(0, (a, b) -> a+b); Integer sum = value.getAsInt();

  C. int s = 0; Integer sum = data.map(a -> a).reduce(0, (a-> a + s));

  D. OptionalInt value = data.mapToInt(a -> a).parallel().reduce((a, b) -> a+b); Integer sum = value.getAsInt();

  E. Integer sum = data.mapToInt(a -> a).reduce(0, (a,b)->a+b));

  Correct Answer: DE

• Question 290:

  Given:

  

  What is the result?

  A. X is 2

  B. The compilation fails due to an error in line 1

  C. The compilation fails due to an error in line 2

  D. Error parsing value 0

  E. X is 10

  Correct Answer: C