1Z0-819 Exam - Java SE 11 Developer

NEW QUESTION 1
Given:

Which two changes need to be made to make this class compile? (Choose two.)

• A. Change Line 1 to an abstract class:public abstract class API {
• B. Change Line 2 access modifier to protected:protected void checkValue(Object value)throws IllegalArgumentException;
• C. Change Line 1 to a class:public class API {
• D. Change Line 1 to extend java.lang.AutoCloseable:public interface API extends AutoCloseable {
• E. Change Line 2 to an abstract method:public abstract void checkValue(Object value)throws IllegalArgumentException;

Answer: CE

NEW QUESTION 2
Given:
var fruits = List.of(“apple”, “orange”, “banana”, “lemon”);
You want to examine the first element that contains the character n. Which statement will accomplish this?

• A. String result = fruits.stream().filter(f > f.contains(“n”)).findAny();
• B. fruits.stream().filter(f > f.contains(“n”)).forEachOrdered(System.out::print);
• C. Optional<String> result = fruits.stream().filter(f > f.contains (“n”)).findFirst ();
• D. Optional<String> result = fruits.stream().anyMatch(f > f.contains(“n”));

Answer: B

Explanation:

NEW QUESTION 3
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 4
Given the code fragment:

What is the result?

• A. 23
• B. 12
• C. 123
• D. 13

Answer: A

Explanation:

NEW QUESTION 5
Given:

What is the result?

• A. null
• B. nothing
• C. It fails to compile.
• D. java.lang.IllegalAccessException is thrown.
• E. Student

Answer: C

NEW QUESTION 6
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 7
Given:

Which option should you choose to enable the code to print Something happened?

• A. Add extends GeneralException on line 1.Add extends Exception on line 2.
• B. Add extends SpecificException on line 1.Add extends GeneralException on line 2.
• C. Add extends Exception on line 1.Add extends Exception on line 2.
• D. Add extends Exception on line 1.Add extends GeneralException on line 2.

Answer: D

Explanation:

NEW QUESTION 8
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 9
Which is the correct order of possible statements in the structure of a Java class file?

• A. class, package, import
• B. package, import, class
• C. import, package, class
• D. package, class, import
• E. import, class, package

Answer: B

NEW QUESTION 10
What makes Java dynamic?

• A. At runtime, classes are loaded as needed, and new code modules can be loaded on demand.
• B. The runtime can process machine language sources as well as executables from different language compilers.
• C. The Java compiler uses reflection to test if class methods are supported by resources of a target platform.
• D. The Java compiler preprocesses classes to run on specific target platforms.

Answer: A

NEW QUESTION 11
Given:

Why does D cause a compilation error?

• A. D inherits a() only from C.
• B. D inherits a() from B and C but the return types are incompatible.
• C. D extends more than one interface.
• D. D does not define any method.

Answer: B

NEW QUESTION 12
Given:

Which annotation should be used to remove warnings from compilation?

• A. @SuppressWarnings on the main and print methods
• B. @SuppressWarnings(“unchecked”) on main and @SafeVarargs on the print method
• C. @SuppressWarnings(“rawtypes”) on main and @SafeVarargs on the print method
• D. @SuppressWarnings(“all”) on the main and print methods

Answer: B

Explanation:

NEW QUESTION 13
Given:

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

• A. map.forEach((k, v) -> set(v)));
• B. set(map.values());
• C. super.set(List<String> map)
• D. super.set(map.values());
• E. set(map)

Answer: BD

NEW QUESTION 14
Given:
String originalPath = “data\\projects\\a-project\\..\\..\\another-project”; Path path = Paths.get(originalPath); System.out.print(path.normalize());
What is the result?

• A. data\another-project
• B. data\projects\a-project\another-project
• C. data\\projects\\a-project\\..\\..\\another-project
• D. data\projects\a-project\..\..\another-project

Answer: D

Explanation:

NEW QUESTION 15
Given the code fragment:

Which “for” loop produces the same output?

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

Answer: C

NEW QUESTION 16
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