How Many Questions Of 1Z0-819 Preparation

NEW QUESTION 1
Which command line runs the main class com.acme.Main from the module com.example?

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

Answer: D

NEW QUESTION 2
Given the contents:
MessageBundle.properties file: message=Hello MessageBundle_en.properties file: message=Hello (en) MessageBundle_US.properties file: message=Hello (US) MessageBundle_en_US.properties file: message=Hello (en_US) MessageBundle_fr_FR.properties file: message=Bonjour
and the code fragment: Locale.setDefault(Locale.FRANCE);
Locale currentLocale = new Locale.Builder().setLanguage(“en”).build();
ResourceBundle messages = ResourceBundle.getBundle(“MessageBundle”, currentLocale); System.out. println(messages.getString(“message”));
Which file will display the content on executing the code fragment?

• A. MessageBundle_en_US.properties
• B. MessageBundle_en.properties
• C. MessageBundle_fr_FR.properties
• D. MessageBundle_US.properties
• E. MessageBundle.properties

Answer: C

NEW QUESTION 3
Given:

Which two allow a.Main to allocate a new Person? (Choose two.)

• A. In Line 1, change the access modifier to privateprivate Person() {
• B. In Line 1, change the access modifier to publicpublic Person() {
• C. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
• D. In Line 2, change the access modifier to protectedprotected class Main {
• E. In Line 1, remove the access modifierPerson() {

Answer: BC

NEW QUESTION 4
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 5
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 6
Given:

What is the result?

• A. 4
• B. 3
• C. An exception is thrown at runtime.
• D. 5

Answer: D

Explanation:

NEW QUESTION 7
Given:

What is the output?

• A. Hello world!Bonjour le monde!
• B. Hello world!Hello world!
• C. Bonjour le monde!Hello world!
• D. Bonjour le monde!Bonjour le monde!

Answer: C

Explanation:

NEW QUESTION 8
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?

• A. The compilation fails because there is no zero args constructor defined in class X.
• B. The compilation fails because either class X or class Y needs to implement the toString() method.
• C. The compilation fails because a final class cannot extend another class.
• D. The compilation succeeds.

Answer: B

Explanation:

NEW QUESTION 9
Which set of commands is necessary to create and run a custom runtime image from Java source files?

• A. java, jdeps
• B. javac, jlink
• C. jar, jlink
• D. javac, jar

Answer: B

NEW QUESTION 10
Given the code fragment:

What is the result?

• A. ab cd ef
• B. An ArrayIndexOutOfBoundsException is thrown at runtime.
• C. The compilation fails.
• D. abc def
• E. ad be cf

Answer: E

NEW QUESTION 11
Given:

Which two lines cause compilation errors? (Choose two.)

• A. line 12
• B. line 6
• C. line 9
• D. line 8
• E. line 7

Answer: BE

NEW QUESTION 12
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 13
Given:
var data = new ArrayList<>(); data.add(“Peter”);
data.add(30); data.add(“Market Road”); data.set(1, 25); data.remove(2); data.set(3, 1000L); System.out.print(data); What is the output?

• A. [Market Road, 1000]
• B. [Peter, 30, Market Road]
• C. [Peter, 25, null, 1000]
• D. An exception is thrown at run time.

Answer: D

Explanation:

NEW QUESTION 14
Given:

What is the result?

• A. The compilation fails at line 9.
• B. The compilation fails at line 2.
• C. Hello World
• D. The compilation fails at line 8.

Answer: C

Explanation:

NEW QUESTION 15
Given:

What is the output?

• A. 300
• B. Exception
• C. 200
• D. 100

Answer: A

Explanation:

NEW QUESTION 16
Examine these module declarations:

Which two statements are correct? (Choose two.)

• A. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.
• B. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.
• C. The Consumer module should require the ServiceProvider module.
• D. The ServiceProvider module should export the com.myimpl package.
• E. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the com.example.api API.

Answer: AC

NEW QUESTION 17
Given:

and

Which code fragment on line 1 makes the s1 set contain the names of all employees born before January 1, 1989?

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

Answer: B

NEW QUESTION 18
Which code fragment does a service use to load the service provider with a Print interface?

• A. private Print print = com.service.Provider.getInstance();
• B. private java.util.ServiceLoader<Print> loader = ServiceLoader.load (Print.class);
• C. private java.util.ServiceLoader<Print> loader = new java.util.ServiceLoader<> ();
• D. private Print print = new com.service.Provider.PrintImpl();

Answer: B

NEW QUESTION 19
Given:

What is the result?

• A. nothing
• B. It fails to compile.
• C. A java.lang.IllegalArgumentException is thrown.
• D. 10

Answer: B

Explanation:

NEW QUESTION 20
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