All About 100% Guarantee 1Z0-819 Actual Test

NEW QUESTION 1
Given this enum declaration:

Examine this code: System.out.println(Letter.values()[1]);
What code should be written at line 5 for this code to print 200?

• A. public String toString() { return String.valueOf(ALPHA.v); }
• B. public String toString() { return String.valueOf(Letter.values()[1]); }
• C. public String toString() { return String.valueOf(v); }
• D. String toString() { return “200”; }

Answer: C

Explanation:

NEW QUESTION 2
Given:

What is the type of x?

• A. char
• B. List<Character>
• C. String
• D. List<String>

Answer: C

NEW QUESTION 3
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 4
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 5
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 6
Which two commands are used to identify class and module dependencies? (Choose two.)

• A. jmod describe
• B. java Hello.java
• C. jdeps --list-deps
• D. jar --show-module-resolution
• E. java --show-module-resolution

Answer: CE

NEW QUESTION 7
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 8
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 9
Given:

Which two are correct? (Choose two.)

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

Answer: CD

NEW QUESTION 10
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 11
Given the formula to calculate a monthly mortgage payment:

and these declarations:

How can you code the formula?

• A. m = p * (r * Math.pow(1 + r, n) / (Math.pow(1 + r, n) - 1));
• B. m = p * ((r * Math.pow(1 + r, n) / (Math.pow(1 + r, n)) - 1));
• C. m = p * r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1;
• D. m = p * (r * Math.pow(1 + r, n) / Math.pow(1 + r, n) - 1);

Answer: A

NEW QUESTION 12
Given:

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

• A. after line 8
• B. after line 6
• C. after line 5
• D. after line 10

Answer: B

Explanation:

NEW QUESTION 13
Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

• A. .map(Employee::getLocality).distinct().count();
• B. map(e > e.getLocality()).count();
• C. .map(e > e.getLocality()).collect(Collectors.toSet()).count();
• D. .filter(Employee::getLocality).distinct().count();

Answer: D

NEW QUESTION 14
Given:

What is known about the Sportscar class?

• A. The Sportscar class is a subclass of Automobile and inherits its methods.
• B. The Sportscar subclass cannot override setTurbo method from the superclass Automobile.
• C. The Sportscar class is a superclass that has more functionality than the Automobile class.
• D. The Sportscar class inherits the setTurbo method from the superclass Automobile.

Answer: A

NEW QUESTION 15
Given:

Which two statements are valid to be written in this interface? (Choose two.)

• A. public abstract void methodB();
• B. final void methodG(){System.out.println(“G”);}
• C. private abstract void methodC();
• D. public String methodD();
• E. public int x;
• F. final void methodE();
• G. public void methodF(){System.out.println(“F”);}

Answer: AD

NEW QUESTION 16
......