Oracle 1z1-819 Exam Preparation Guide and PDF Download [Q43-Q66]

Oracle 1z1-819 Exam Preparation Guide and PDF Download

Verified & Correct 1z1-819 Practice Test Reliable Source Dec 10, 2023 Updated

NEW QUESTION # 43
Given:

Which three are correct? (Choose three.)

A. b1.foo(li) prints Hola Mundo!
B. f1.foo(li) prints Hello world!
C. f2.foo(li) prints Bonjour le monde!
D. b1.foo(li) prints Hello world!
E. f1.foo(li) prints Bonjour le monde!
F. f1.foo(li) prints Hola Mundo!
G. f2.foo(li) prints Hola Mundo!
H. f2.foo(li) prints Hello world!
I. b1.foo(li) prints Bonjour le monde!

Answer: A,D,E

NEW QUESTION # 44
Given:

Which three classes successfully override printOne()? (Choose three.)

A. Option F
B. Option A
C. Option E
D. Option C
E. Option D
F. Option B

Answer: B,D,E

NEW QUESTION # 45
Which command line runs the main class com.acme.Main from the module com.example?

A. java -classpath com.example.jar com.acme.Main
B. java -classpath com.example.jar -m com.example/com.acme.Main
C. java --module-path mods -m com.example/com.acme.Main
D. java --module-path mods com.example/com.acme.Main

Answer: B

NEW QUESTION # 46
Given:
/code/a/Test.java
containing:

and
/code/b/Best.java
containing:
package b;
public class Best { }
Which is the valid way to generate bytecode for all classes?

A. javac -d /code /code/a/Test.java
B. java -cp /code a.Test
C. java /code/a/Test.java
D. javac -d /code /code/a/Test.java /code/b/Best.java
E. javac -d /code /code/a/Test
F. java /code/a/Test.java /code/b/Best.java

Answer: D

NEW QUESTION # 47
Given:

Which is true?

A. The code prints 25.
B. The code does not compile.
C. The code throws an exception at runtime.
D. The code compiles but does not print any result.

Answer: B

NEW QUESTION # 48
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?

A. SQL injection attack against the specified host and port
B. none because the customer code base must also be granted SocketPermission
C. XML injection attack against any mlib server
D. denial of service attack against any reachable machine
E. privilege escalation attack against the OS running the customer code

Answer: A

NEW QUESTION # 49
What change will cause the code to compile successfully?

A. Insert PriceChecker <Electronics> prod on line 1.
B. Insert PriceChecker <Plushy extends Products> prod on line 1.
C. Insert PriceChecker <> prod on line 1.
D. Insert PriceChecker (?) prod on line 1.

Answer: D

NEW QUESTION # 50
Given:

What is the result?

A. 0
B. 1
C. 2
D. 3

Answer: A

Explanation:

NEW QUESTION # 51
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 A
C. Option C
D. Option B

Answer: B

NEW QUESTION # 52
Given:

What is required to make the Foo class thread safe?

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

Answer: D

NEW QUESTION # 53
Given:

Which statement on line 1 enables this code to compile?

A. Function f = n > n * 2;
B. Function<int> f = n > n * 2;
C. Function<Integer, Integer> f = n > n * 2;
D. Function<Integer> f = n > n * 2;
E. Function<int, int> f = n > n * 2;

Answer: C

Explanation:

NEW QUESTION # 54
Assume ds is a DataSource and the EMP table is defined appropriately.

What does executing this code fragment do?

A. inserts one row (101, 'SMITH', 'HR')
B. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')
C. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)
D. throws a SQLException

Answer: A

NEW QUESTION # 55
Given:

Which one is correct?

A. Three threads are created.
B. An IllegalThreadStateException is thrown at run time.
C. The compilation fails.
D. Four threads are created.

Answer: B

Explanation:

NEW QUESTION # 56
Given:

What is the result?

A. [0). o, | 1). i, | 2). r]
B.
C. ArrayIndexOutOfBounds Exception is thrown at runtime.
D. The compilation fails.
[0). D, | 1). i, | 2). a]
E. [). o, | 1). a, | 2).]

Answer: D

NEW QUESTION # 57
Given:

How many LocalDate objects are created in this example?

A. 0
B. 1
C. 2
D. 3

Answer: A

NEW QUESTION # 58
Given:

What is the result?

A. An exception is thrown at runtime.
B. 0
C. 1
D. 2

Answer: D

Explanation:

NEW QUESTION # 59
Given:

Which two methods modify field values? (Choose two.)

A. setTCount
B. setAllCounts
C. setCCount
D. setACount
E. setGCount

Answer: B,E

NEW QUESTION # 60
Given:

What is the result?

A. null
B. An exception is thrown at runtime.
C. Dr. Null
D. Dr. Who

Answer: A

Explanation:

NEW QUESTION # 61
Given the code fragment:

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

A. replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
B. replace line 3 with
synchronized(test) {
test.count++;
}
C. replace line 3 with
synchronized(test.count) {
test.count++;
}
D. replace line 1 with private volatile int count = 0;
E. replace line 2 with public static synchronized void main(String[] args) {

Answer: A,C

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

NEW QUESTION # 62
Given:

Which three are true? (Choose three.)