1Z0-819 Exam - Java SE 11 Developer

NEW QUESTION 1
Given:

Which statement is true?

• A. Class Tester does not need to import java.time.LocalDate because it is already visible to members of the package test.
• B. All classes from the package java.tim
• C. are loaded for the class Diary.
• D. Only LocalDate class from java.time package is loaded.
• E. Tester must import java.time.LocalDate in order to compile.

Answer: A

NEW QUESTION 2
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 3
Which statement about access modifiers is correct?

• A. An instance variable can be declared with the static modifier.
• B. A local variable can be declared with the final modifier.
• C. An abstract method can be declared with the private modifier.
• D. An inner class cannot be declared with the public modifier.
• E. An interface can be declared with the protected modifier.

Answer: B

NEW QUESTION 4
Given:

What is the result?

• A. [0,0] = Red[0,1] = White[1,0] = Black[1,1] = Blue[2,0] = Yellow[2,1] = Green[3,0] = Violet
• B. [0,0] = Red[1,0] = Black[2,0] = Blue
• C. java.lang.ArrayIndexOutOfBoundsException thrown
• D. [0,0] = Red[0,1] = White[1,0] = Black[2,0] = Blue[2,1] = Yellow[2,2] = Green[2,3] = Violet

Answer: D

Explanation:

NEW QUESTION 5
Which two statements correctly describe capabilities of interfaces and abstract classes? (Choose two.)

• A. Interfaces cannot have protected methods but abstract classes can.
• B. Both interfaces and abstract classes can have final methods.
• C. Interfaces cannot have instance fields but abstract classes can.
• D. Interfaces cannot have static methods but abstract classes can.
• E. Interfaces cannot have methods with bodies but abstract classes can.

Answer: AC

NEW QUESTION 6
Given:

What action ensures successful compilation?

• A. Replace public Color(int c) with private Color(int c).
• B. Replace int c; with private int c;.
• C. Replace int c; with private final int c;.
• D. Replace enum Color implements Serializable with public enum Color.
• E. Replace enum Color with public enum Color.

Answer: A

Explanation:

NEW QUESTION 7
Given:

It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?

• A. setLeft and setRight must be protected.
• B. left and right must be private.
• C. isValid must be public.
• D. left, right, setLeft, and setRight must be private.

Answer: B

NEW QUESTION 8
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?

• A. /scratch/exam/new.txt and /scratch/new.txt are deleted.
• B. The program throws a FileaAlreadyExistsException.
• C. The program throws a NoSuchFileException.
• D. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.

Answer: C

Explanation:

NEW QUESTION 9
Given:

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

• A. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
• B. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• C. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• D. Stream<String> lines = Files.lines(INPUT_FILE_NAME);

Answer: C

NEW QUESTION 10
Given:

Which two independent changes will make the Main class compile? (Choose two.)

• A. Move the entire Student class declaration to a separate Java file, Student.java.
• B. Change line 2 to public Student(String classname).
• C. Change line 1 to public class Student {.
• D. Change line 3 to Student student = new Student(“Biology”);.
• E. Change line 1 to static class Student {.

Answer: BD

Explanation:

NEW QUESTION 11
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 12
Given the code fragment:
var pool = Executors.newFixedThreadPool(5);
Future outcome = pool.submit(() > 1);
Which type of lambda expression is passed into submit()?

• A. java.lang.Runnable
• B. java.util.function.Predicate
• C. java.util.function.Function
• D. java.util.concurrent.Callable

Answer: D

NEW QUESTION 13
Which describes a characteristic of setting up the Java development environment?

• A. Setting up the Java development environment requires that you also install the JRE.
• B. The Java development environment is set up for all operating systems by default.
• C. You set up the Java development environment for a specific operating system when you install the JDK.
• D. Setting up the Java development environment occurs when you install an IDE before the JDK.

Answer: D

NEW QUESTION 14
Which describes an aspect of Java that contributes to high performance?

• A. Java prioritizes garbage collection.
• B. Java has a library of built-in functions that can be used to enable pipeline burst execution.
• C. Java monitors and optimizes code that is frequently executed.
• D. Java automatically parallelizes code execution.

Answer: C

NEW QUESTION 15
Given:

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

• A. public List<Integer> foo(Set<CharSequence> m) { ... }
• B. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
• C. public List<Integer> foo(TreeSet<String> m) { ... }
• D. public List<Integer> foo(Set<String> m) { ... }
• E. public List<Object> foo(Set<CharSequence> m) { ... }
• F. public ArrayList<Integer> foo(Set<String> m) { ... }

Answer: BC

NEW QUESTION 16
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