Java SE 11 Developer - 1Z0-819 Exam Practice Test

Question 1

Given:

What is the result?

A. The compilation fails.

B. SomeClass#methodA()SomeClass#methodA()

C. AnotherClass#methodA()AnotherClass#methodA()

D. A ClassCastException is thrown at runtime.

E. AnotherClass#methodA()SomeClass#methodA()

F. SomeClass#methodA()AnotherClass#methodA()

Correct Answer: A

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Question 2

Given:

Which three are correct? (Choose three.)

A. b1.foo(li) prints Hello world!

B. f2.foo(li) prints Bonjour le monde!

C. f1.foo(li) prints Hola Mundo!

D. f1.foo(li) prints Hello world!

E. b1.foo(li) prints Bonjour le monde!

F. f2.foo(li) prints Hola Mundo!

G. b1.foo(li) prints Hola Mundo!

H. f2.foo(li) prints Hello world!

I. f1.foo(li) prints Bonjour le monde!

Correct Answer: A,G,I

Question 3

Given the code fragment:

What is the output?

A. The compilation fails.

B. [-1, -2, -3]

C. [-3, -2, -1]

D. A runtime exception is thrown.

Correct Answer: D

Question 4

Given:

and:

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

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

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

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

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

Correct Answer: A

Question 5

Given:

Which one is correct?

A. The compilation fails.

B. An IllegalThreadStateException is thrown at run time.

C. Four threads are created.

D. Three threads are created.

Correct Answer: B

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Question 6

Given:

What is the result?

A. b2

B. 2

C. b3

D. 1

E. 3

F. b1

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

Correct Answer: E

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Question 7

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, readAttributes (path, FileAttributes, class);

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

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

D. BasicFileAttributes attributes = Files isDirectory (path);

Correct Answer: A

Question 8

Given the code fragment:
Which two code snippets inserted independently inside println method print Mondial:domainmodel? (Choose two.)

A. prefix + getName

B. new Main().prefix + new Main().name

C. prefix + name

D. prefix + Main.name

E. Main.prefix + Main.getName()

F. Main.prefix + Main.name

Correct Answer: A,E

Question 9

Given the code fragment:

You want to display the value of currency as $100.00.
Which code inserted on line 1 will accomplish this?

A. NumberFormat formatter = NumberFormat.getCurrency(locale);

B. NumberFormat formatter = NumberFormat.getInstance(locale);

C. NumberFormat formatter = NumberFormat.getCurrencyInstance(locale);

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

Correct Answer: D

Question 10

There is a copyServiceAPI that has the org.copyservice. spi. Copy interface To use this service in a module, which module- info.java would be correct?

A.

B.

C.

D.

Correct Answer: A

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.

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

C. Enclose the call to new Socket In an AccessController.doPrivileged block.

D. Make enableService private.

Correct Answer: C

Question 12

Why does this compilation fail?

A. The method print (object) and the method print (object...) are duplicates of each other.

B. In method x. print (Collection), system. Out :: prints is an invalid Java identifier.

C. The method Y. print (object) does not call the method super.print (object)

D. The method Y. print (object...) cannot override the final method x.print (object....).

E. The method x. print (object) is not accessible to Y.

Correct Answer: A

Question 13

Given:

Which two statements are valid to be written in this interface? (Choose two.)

A. public void methodF(){System.out.println("F");}

B. public int x;

C. final void methodE();

D. public abstract void methodB();

E. public String methodD();

F. private abstract void methodC();

G. final void methodG(){System.out.println("G");}

Correct Answer: D,E

Question 14

Which set of commands is necessary to create and run a custom runtime image from Java source files?

A. javac, jlink

B. javac, jar

C. jar, jlink

D. java, jdeps

Correct Answer: A

Oracle Java SE 11 Developer - 1Z0-819 Exam Practice Test

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