[Jan 13, 2024] 1z1-819 Practice Exam Dumps – 99% Marks In Oracle Exam [Q27-Q50]

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[Jan 13, 2024] 1z1-819 Practice Exam Dumps – 99% Marks In Oracle Exam

Updated Verified 1z1-819 Q&As – Pass Guarantee or Full Refund

QUESTION 27
Given:

Assuming that this code compiles correctly, which three statements are true? (Choose three.)

B cannot be abstract.

B is a subtype of A.

A cannot be abstract.

A cannot be final.

B cannot be final.

A is a subtype of B.

QUESTION 28
Given:

What is the result?

WorkingUnknown

Unknown

TuesdayUnknown

The compilation fails.

Tuesday

Working

QUESTION 29
Given the code fragment:

What is the result?

false true true

true false false

false false true

false true false

QUESTION 30
Given:

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

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

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

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

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

QUESTION 31
Given:

What is the result?

QUESTION 32
Given:

Which two are secure serialization of these objects? (Choose two.)

Define the serialPersistentFields array field.

Declare fields transient.

Implement only readResolve to replace the instance with a serial proxy and not writeReplace.

Make the class abstract.

Implement only writeReplace to replace the instance with a serial proxy and not readResolve.

QUESTION 33
Which code fragment added to line 1 enables the code to compile and print Hello Joe?

QUESTION 34
Your organization makes mlib.jar available to your cloud customers. While working on a new feature for mlib.jar, you see that the customer visible method public void enableService(String hostName, String portNumber) executes this code fragment

and you see this grant is in the security policy file:

What security vulnerability does this expose to your cloud customer’s code?

privilege escalation attack against the OS running the customer code

SQL injection attack against the specified host and port

XML injection attack against any mlib server

none because the customer code base must also be granted SocketPermission

denial of service attack against any reachable machine

QUESTION 35
Given:

After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?

after line 8

after line 6

after line 5

after line 10

QUESTION 36
Given:

What is the output?

I am an object array

The compilation fails due to an error in line 1.

I am an array

I am an object

QUESTION 37
Given the code fragment:

What is the result?

-1

-3

QUESTION 38
Given:

Which two constructors will compile and set the class field strings? (Choose two.)

Option A

Option B

Option C

Option D

Option E

QUESTION 39
Assuming the Widget class has a getPrice method, this code does not compile:

Which two statements, independently, would allow this code to compile? (Choose two.)

Replace line 5 with widgetStream.filter(a > ((Widget)a).getPrice() > 20.00).

Replace line 1 with List<Widget> widgetStream = widgets.stream();.

Replace line 5 with widgetStream.filter((Widget a) > a.getPrice() > 20.00).

Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.

QUESTION 40
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?

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

The program throws a FileaAlreadyExistsException.

The program throws a NoSuchFileException.

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

QUESTION 41
Given the code fragment:

You must make the countvariable thread safe.
Which two modifications meet your requirement? (Choose two.)

replace line 2 with public static synchronized void main(String[] args) {

replace line 1 with private volatile int count = 0;

replace line 3 with
synchronized(test) {
test.count++;
}

replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();

replace line 3 with
synchronized(test.count) {
test.count++;
}

Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164

QUESTION 42
Given the code fragment:

What is the result?

13 5 7 9

1 3 5 7 9 11

2 4 6 B 10

2 4 6 8

QUESTION 43
Given:

Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)

public List<Integer> foo(Set<CharSequence> m) { … }

public ArrayList<Number> foo(Set<CharSequence> m) { … }

public List<Integer> foo(TreeSet<String> m) { … }

public List<Integer> foo(Set<String> m) { … }

public List<Object> foo(Set<CharSequence> m) { … }

public ArrayList<Integer> foo(Set<String> m) { … }

QUESTION 44

Why does this compilation fail?

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

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

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

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

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

QUESTION 45
Given:
jdeps -jdkinternals C:workspace4SimpleSecurityjarclasses.jar
Which describes the expected output?

jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.

jdeps outputs an error message that the -jdkinternals option requires either the -summary or the – verbose options to output to the console.

The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.

The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

Explanation
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

QUESTION 46
Given:

Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

map.forEach((k, v) -> set(v)));

set(map.values());

super.set(List<String> map)

super.set(map.values());

set(map)

QUESTION 47
Given:

Which expression when added at line 1 will produce the output of 1.17?

float z = (float)(Math.round((float)x/y*100)/100);

float z = Math.round((int)(x/y),2);

float z = Math.round((float)x/y,2);

float z = Math.round((float)x/y*100)/(float)100;

QUESTION 48
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?

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

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

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

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

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

QUESTION 49
Given:

Which is true?

The code compiles but does not print any result.

The code prints 25.

The code does not compile.

The code throws an exception at runtime.

QUESTION 50
You are working on a functional bug in a tool used by your development organization. In your investigation, you find that the tool is executed with a security policy file containing this grant.

What action should you take?

Nothing, because it is an internal tool and not exposed to the public.

Remove the grant because it is excessive.

Nothing, because it is not related to the bug you are investigating.

File a security bug against the tool referencing the excessive permission granted.

Nothing, because listing just the required permissions would be an ongoing maintenance challenge.

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Oracle 1z1-819 certification exam consists of 80 multiple-choice questions that must be answered within 180 minutes. 1z1-819 exam is available in English and Japanese languages and can be taken online or at a testing center. To pass the exam, the developers must score at least 63% of the total marks. 1z1-819 exam fee is $245, and the certification is valid for three years.

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