Free Practice Questions for Oracle 1Z0-819 Exam

Question 1

Given:

What is the result?

A5

B3

C23

D25

E11

Correct Answer: E. 11

Question 2

Which interface in the java.util.function package can return a primitive type?

AToDoubleFunction

BSupplier

CBiFunction

DLongConsumer

Correct Answer: A. ToDoubleFunction

Question 3

Given:

What is the result?

AThe compilation fails.

Babdf

Cabd

Dadf

Eabcd

Correct Answer: E. abcd

Question 4

Given:

Which code fragment on line 1 makes the m map contain the employee with the highest salary for each neighborhood?

A)

B)

C)

D)

AOption A

BOption B

COption C

DOption D

Correct Answer: D. Option D

Question 5

Given the code fragment:

What is the result?

A2

B-1

C1

D-3

Correct Answer: A. 2

Question 6

Given:

What is the result?

Ab1

B2

Cb2

D1

Eb3

F3

GThe compilation fails due to an error in line 1.

Correct Answer: F. 3

Question 7

Given:

What is the result?

A42

BThe compilation fails due to an error in line 4.

C17

DThe compilation fails due to an error in line 3.

EThe compilation fails due to an error in line 2.

FThe compilation fails due to an error in line 1.

GThe compilation fails due to an error in line 5.

Correct Answer: A. 42

Question 8

Given:

You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?

Avar lines = Files.lines(Paths.get(INPUT_FILE_NAME));

BStream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));

Cvar lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));

DStream<String> lines = Files.lines(INPUT_FILE_NAME);

Correct Answer: C. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));

Question 9

Given:

What is the type of the local variable x?

ACharacter

Bchar

CString[ ]

DString

Correct Answer: D. String

Question 10

Which two commands are used to identify class and module dependencies? (Choose two.)

Ajmod describe

Bjava Hello.java

Cjdeps --list-deps

Djar --show-module-resolution

Ejava --show-module-resolution

Correct Answer: C. jdeps --list-deps; E. java --show-module-resolution

Question 11

Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:

What security measures should be added to this method so that it meets the requirements for a customer accessible method?

A.

BCreate a method that validates the hostName and portNumber parameters before opening the socket.

CMake enableService private.

DEnclose the call to new Socket In an AccessController.doPrivileged block.

Correct Answer: D. Enclose the call to new Socket In an AccessController.doPrivileged block.

Question 12

Given the code fragment:

You want to display the value of currency as $100.00.

Which code inserted on line 1 will accomplish this?

ANumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();

BNumberFormat formatter = NumberFormat.getCurrency(locale);

CNumberFormat formatter = NumberFormat.getInstance(locale);

DNumberFormat formatter = NumberFormat.getCurrencyInstance(locale);

Correct Answer: A. NumberFormat formatter = NumberFormat.getInstance(locale).getCurrency();

Question 13

What change will cause the code to compile successfully?

AInsert PriceChecker (?) prod on line 1.

BInsert PriceChecker <> prod on line 1.

CInsert PriceChecker <Electronics> prod on line 1.

DInsert PriceChecker <Plushy extends Products> prod on line 1.

Correct Answer: A. Insert PriceChecker (?) prod on line 1.

Question 14

Given:

and

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

AOption A

BOption B

COption C

DOption D

Correct Answer: B. Option B

Question 15

Given:

What is the result?

A)

B)

C)

D)

AOption A

BOption B

COption C

DOption D

Correct Answer: A. Option A