Oracle Oracle Certifications 1Z0-819 Questions & Answers

• Question 161:

  Given the code fragment:

  

  What is the result?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C

• Question 162:

  Given:

  

  What is the output?

  A. I am an object array

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

  C. I am an array

  D. I am an object

  Correct Answer: D

• Question 163:

  Given:

  

  You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?

  A. Extend AutoCloseable and override the close method.

  B. Implement AutoCloseable and override the autoClose method.

  C. Extend AutoCloseable and override the autoClose method.

  D. Implement AutoCloseable and override the close method.

  Correct Answer: D

  Reference: https://stackabuse.com/the-try-with-resources-statement-in-java/

• Question 164:

  Given:

  

  What is the result?

  A. The code prints nothing.

  B. 0

  C. 10

  D. 0 4 9

  E. 0 8

  Correct Answer: E

• Question 165:

  Given: Which two codes, independently, can be inserted in line to 1 compile?

  

  A. Abacus aba = (int m, int n) -> { m * n };

  B. Abacus aba = (int e, int f) -> { return e * f; };

  C. Abacus aba = (a, b) -> a * b;

  D. Abacus aba = v, w -> x * y;

  E. Abacus aba = (int i, j) -> ( return i * j; };

  Correct Answer: CE

• Question 166:

  Given the code fragment:

  

  What is the result?

  A. EUR -> 0.84 GBP -> 0.75 USD -> 1.00 CNY -> 6.42

  B. The compilation fails.

  C. CNY -> 6.42 EUR -> 0.84 GBP -> 0.75 USD -> 1.00

  D. USD -> 1.00 GBP -> 0.75 EUR -> 0.84 CNY -> 6.42

  Correct Answer: B

  

  Text

• Question 167:

  Consider this method declaration:

  

  "SET SESSION AUTHORIZATION " + user

  "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)

  Is A or B the correct replacement for and why?

  A. A, because it sends exactly the value of user provided by the calling code.

  B. because enquoting values provided by the calling code prevents SQL injection.

  C. A and B are functionally equivalent.

  D. A, because it is unnecessary to enclose identifiers in quotes.

  E. B, because all values provided by the calling code should be enquoted.

  Correct Answer: A

  Reference:https://www.google.com/url?sa=tandrct=jandq=andesrc=sandsource=webandcd=4andved=2ahUKEwj7ycO80fLoAhVHPcAKHcoLC9cQFjADegQIAxABandurl=ftp%3A%2F%2Fftp.software.ibm.com%2Fps%2Fproducts%2Fdb2%2Finfo%2Fvr9% 2Fpdf%2Fletter%2Fen_US%2Fdb2s2e90.pdfandusg=AOvVaw2VqpeEh5HpbeXfa0OB5Lec

• Question 168:

  Which three annotation uses are valid? (Choose three.)

  A. Function func = (@NonNull x) > x.toUpperCase();

  B. var v = "Hello" + (@Interned) "World"

  C. Function func = (var @NonNull x) > x.toUpperCase();

  D. Function func = (@NonNull var x) > x.toUpperCase();

  E. var myString = (@NonNull String) str;

  F. var obj = new @Interned MyObject();

  Correct Answer: ACF

• Question 169:

  Which two statements set the default locale used for formatting numbers, currency, and percentages? (Choose two.)

  A. Locale.setDefault(Locale.Category.FORMAT, "zh-CN");

  B. Locale.setDefault(Locale.Category.FORMAT, Locale.CANADA_FRENCH);

  C. Locale.setDefault(Locale.SIMPLIFIED_CHINESE);

  D. Locale.setDefault("en_CA");

  E. Locale.setDefault("es", Locale.US);

  Correct Answer: BD

  Reference: https://www.oracle.com/technical-resources/articles/javase/locale.html

• Question 170:

  Given the code fragment:

  

  You want to examine whether path is a directory.

  Which code inserted on line 1 will accomplish this?

  A. BasicFileAttributes attributes = Files isDirectory (path);

  B. BasicFileAttributes attributes =Files.getAttribute (path, `'insdirectory'');

  C. BasicFileAttributes attributes = Files.readAttributes(path, BasicFileAttributes.class

  D. BasicFileAttributes attributes = Files, readAttributes (path, FileAttributes, class);

  Correct Answer: D