Java SE 11 Developer (1Z0-819) Free Practice Test

Question 1

Given:

and
checkQuality(QUALITY.A);
and

Which code fragment can be inserted into the switch statement to print Best?

A. A

B. A.toString()

C. QUALITY.A.ValueOf()

D. QUALITY.A

Correct Answer: A

Question 2

Given:

Taking into account that the order of the elements is unpredictable, what is the output?

A. {mismatch=2, am=2, first=1, second=1}

B. {am=2, first=1, mismatch=1, second=2}

C. {mismatch=1, am=2, first=1, second=1}

D. {l=mismatch, 2=am}

Correct Answer: C

Question 3

Given TripleThis.java:

Compiling TripleThis.java gives this compiler warning:
Note: TripleThis.java uses unchecked or unsafe operations.
Which two replacements done together remove this compiler warning?

A. Replace line 12 with public static void printValue function<Integer> f, int num) {.

B. Replace line 12 with public static int printValue function<Integer, Integer>, f, T num {.

C. Replace line 9 with function<Integer> tripler = x-> - { return (Integer) X * 3 ; }.

D. Replace line 12 with public static <T> void printValue (Function<T, T> f, T num ) {,

E. Replace line 9 with function<Integer>, Integer> = X -> { return (integer) x * 3; }.

Correct Answer: B,C

Question 4

Which is a proper JDBC URL?

A. http://localhost mysql.jdbc:3306/database

B. jdbc:mysql://localhost:3306/database

C. jdbe.mysql.com://localhost:3306/database

D. http://localhost.mysql.com:3306/database

Correct Answer: B

Question 5

Given:

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

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

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

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

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

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

Correct Answer: A,D

Question 6

Given:

What is the result?

A. sphynx
oxicat
laperm
korat
bengal
abyssinian

B. nothing

C. abyssinian
oxicat
korat
laperm
bengal
sphynx

D. abyssinian
bengal
korat
laperm
oxicat
sphynx

Correct Answer: A

Question 7

Given:

You want to obtain the Filechannel object on line 1.
Which code fragment will accomplish this?

A.

B.

C.

D.

Correct Answer: D

Question 8

Given:

What is the output?

A.

B.

C.

D.

Correct Answer: A

Question 9

Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?

A. Option D

B. Option C

C. Option A

D. Option B

Correct Answer: C

Question 10

Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

A. .map(e -> e.getLocality())
.collect(Collectors.toSet())
.count();

B. map(e -> e.getLocality())
.count();

C. .map(Employee::getLocality)
.distinct()
.count();

D. .filter(Employee::getLocality)
.distinct()
.count();

Correct Answer: D

Question 11

Given:

What is the result?

A. Hat at store 4

B. Hat at store 1

C. At once 1

D. An indexOutofBoundsException is thrown at runtime.

E. At once 0

Correct Answer: B

Question 12

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

A. jmod describe

B. java --show-module-resolution

C. jar --show-module-resolution

D. java Hello.java

E. jdeps --list-deps

Correct Answer: B,E

Question 13

Given the directory structure:

What is the result?

A.

B.

C.

D.

Correct Answer: C

Question 14

Given the code fragment:
Path currentFile = Paths.get("/scratch/exam/temp.txt");
Path outputFile = Paths get("/scratch/exam/new.txt");
Path directory = Paths.get("/scratch/");
Files.copy(currentFile, outputFile);
Files.copy(outputFile, directory);
Files.delete (outputFile);
The /scratch/exam/temp.txt file exists. The /scratch/exam/new.txt and /scratch/new.txt files do not exist.
What is the result?

A. The program throws a NoSuchFileException.

B. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.

C. /scratch/exam/new.txt and /scratch/new.txt are deleted.

D. The program throws a FileaAlreadyExistsException.

Correct Answer: A

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Question 15

Which describes a characteristic of setting up the Java development environment?

A. The Java development environment is set up for all operating systems by default.

B. Setting up the Java development environment occurs when you install an IDE before the JDK.

C. Setting up the Java development environment requires that you also install the JRE.

D. You set up the Java development environment for a specific operating system when you install the JDK.

Correct Answer: B

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Oracle Java SE 11 Developer (1Z0-819) Free Practice Test