The Far Out Guide To 1Z0-819 Exam Question

NEW QUESTION 1
Given:

Assume the file on path does not exist. What is the result?

• A. The compilation fails.
• B. /u01/work/filestore.txt is not deleted.
• C. Exception
• D. /u01/work/filestore.txt is deleted.

Answer: A

Explanation:

NEW QUESTION 2
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 A
• B. Option B
• C. Option C
• D. Option D

Answer: A

NEW QUESTION 3
Given:

What is required to make the Foo class thread safe?

• A. No change is required.
• B. Make the declaration of lock static.
• C. Replace the lock constructor call with new ReentrantLock (true).
• D. Move the declaration of lock inside the foo method.

Answer: C

NEW QUESTION 4
Which two statements are true about Java modules? (Choose two.)

• A. Modular jars loaded from --module-path are automatic modules.
• B. Any named module can directly access all classes in an automatic module.
• C. Classes found in –classpath are part of an unnamed module.
• D. Modular jars loaded from –classpath are automatic modules.
• E. If a package is defined in both the named module and the unnamed module, then the package in the unnamed module is ignored.

Answer: AC

NEW QUESTION 5
Given these two classes:


And given this fragment:

Which describes the fragment?

• A. It throws IllegalMonitorStateException.
• B. It is subject to deadlock.
• C. It is subject to livelock.
• D. The code does not compile.

Answer: D

NEW QUESTION 6
Given:

What is the output?

• A. null
• B. A NoSuchElementException is thrown at run time.
• C. Duke
• D. A NullPointerException is thrown at run time.

Answer: C

Explanation:

NEW QUESTION 7
Given:

What is the type of the local variable x?

• A. Character
• B. char
• C. String[ ]
• D. String

Answer: D

NEW QUESTION 8
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

Answer: D

NEW QUESTION 9
Given the code fragment:

What is the output?

• A. The compilation fail
• B. [-1, -2, -3]
• C. [-3, -2, -1]
• D. A runtime exception is thrown.

Answer: D

NEW QUESTION 10
Given:
List<String> longlist = List.of(“Hello”,”World”,”Beat”); List<String> shortlist = new ArrayList<>();
Which code fragment correctly forms a short list of words containing the letter “e”?

• A. Option A
• B. Option B
• C. Option C
• D. Option D

Answer: C

NEW QUESTION 11
Which two safely validate inputs? (Choose two.)

• A. Delegate numeric range checking of values to the database.
• B. Accept only valid characters and input values.
• C. Use trusted domain-specific libraries to validate inputs.
• D. Assume inputs have already been validated.
• E. Modify the input values, as needed, to pass validation.

Answer: AB

NEW QUESTION 12
Given:

Which two statements are true if the method is added to Bar? (Choose two.)

• A. public Collection<String> foo(Collection<String> arg) { ... } overrides Foo.foo.
• B. public <T> Collection<T> foo(Stream<T> arg) { ... } overloads Foo.foo.
• C. public <T> List<T> foo(Collection<T> arg) { ... } overrides Foo.foo.
• D. public <T> Collection<T> foo(Collection<T> arg) { ... } overloads Foo.foo.
• E. public <T> Collection<T> bar(Collection<T> arg) { ... } overloads Foo.foo.
• F. public <T> Iterable<T> foo(Collection<T> arg) { ... } overrides Foo.foo.

Answer: CF

NEW QUESTION 13
Given:

executed using command:
java Hello “Hello World” Hello World What is the output?

• A. An exception is thrown at runtime.
• B. Hello WorldHello World
• C. Hello World Hello World
• D. Hello WorldHelloWorld
• E. HelloHello WorldHelloWorld

Answer: C

NEW QUESTION 14
Given:

and omitting the throws FooException clause results in a compilation error. Which statement is true about FooException?

• A. FooException is a subclass of RuntimeError.
• B. FooException is unchecked.
• C. The body of foo can only throw FooException.
• D. The body of foo can throw FooException or one of its subclasses.

Answer: D

NEW QUESTION 15
Which two statements independently compile? (Choose two.)

• A. List<? super Short> list = new ArrayList<Number>();
• B. List<? super Number> list = new ArrayList<Integer>();
• C. List<? extends Number> list = new ArrayList<Byte>();
• D. List<? extends Number> list = new ArrayList<Object>();
• E. List<? super Float> list = new ArrayList<Double>();

Answer: AC

Explanation:

NEW QUESTION 16
Given:

What is the result?

• A. b1
• B. 2
• C. b2
• D. 1
• E. b3
• F. 3
• G. The compilation fails due to an error in line 1.

Answer: F

Explanation:

NEW QUESTION 17
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. /scratch/exam/new.txt and /scratch/new.txt are deleted.
• B. The program throws a FileaAlreadyExistsException.
• C. The program throws a NoSuchFileException.
• D. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.

Answer: C

Explanation:

NEW QUESTION 18
Which three annotation uses are valid? (Choose three.)

• A. Function<String, String> func = (@NonNull x) > x.toUpperCase();
• B. var v = “Hello” + (@Interned) “World”
• C. Function<String, String> func = (var @NonNull x) > x.toUpperCase();
• D. Function<String, String> func = (@NonNull var x) > x.toUpperCase();
• E. var myString = (@NonNull String) str;
• F. var obj = new @Interned MyObject();

Answer: ACF

NEW QUESTION 19
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