[Q78-Q98] Oracle 1Z0-819 Practice Verified Answers - Pass Your Exams For Sure! [2021]

Oracle 1Z0-819 Practice Verified Answers - Pass Your Exams For Sure! [2021]

Valid Way To Pass Oracle Java SE's 1Z0-819 Exam

NEW QUESTION 78
Given:

What is the type of x?

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

Answer: B

NEW QUESTION 79
Given:

Which two codes, independently, can be inserted in line to 1 compile?

A. Abacus aba = (int e, int f) -> { return e * f; };
B. Abacus aba = (int m, int n) -> { m * n };
C. Abacus aba = v, w -> x * y;
D. Abacus aba = (int i, j) -> ( return i * j; };
E. Abacus aba = (a, b) -> a * b;

Answer: D,E

NEW QUESTION 80
Which describes an aspect of Java that contributes to high performance?

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

Answer: D

NEW QUESTION 81
Given:

Which is true?

A. The compilation succeeds.
B. The compilation fails due to an error in line 2.
C. The compilation fails due to an error in line 7.
D. The compilation fails due to an error in line 9.
E. The compilation fails due to an error in line 4.
F. The compilation fails due to an error in line 6.
G. The compilation fails due to an error in line 10.

Answer: F

NEW QUESTION 82
Which three initialization statements are correct? (Choose three.)

A. boolean true = (4 == 4);
B. byte b = 10;char c = b;
C. int[][] e = {{1,1},{2,2}};
D. int x = 12_34;
E. float x = 1.99;
F. short sh = (short)'A';
G. String contact# = "(+2) (999) (232)";

Answer: C,D,F

NEW QUESTION 83
Given:

Which statement on line 1 enables this code to compile?

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

Answer: B

Explanation:

NEW QUESTION 84
Given the code fragment:

What is the result?

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

Answer: D

NEW QUESTION 85
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: C

NEW QUESTION 86
Given:

Which two are secure serialization of these objects? (Choose two.)

A. Implement only readResolve to replace the instance with a serial proxy and not writeReplace.
B. Define the serialPersistentFields array field.
C. Declare fields transient.
D. Implement only writeReplace to replace the instance with a serial proxy and not readResolve.
E. Make the class abstract.

Answer: A,B

NEW QUESTION 87
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. A copy of /scratch/exam/new.txt exists in the /scratch directory and /scratch/exam/new.txt is deleted.
C. The program throws a NoSuchFileException.
D. The program throws a FileaAlreadyExistsException.

Answer: C

Explanation:

NEW QUESTION 88
Given:

What is the result?

A. Take extra care
B. Take extra care
Take extra care
C. The program prints nothing.
D. An exception is thrown at runtime

Answer: D

NEW QUESTION 89
There is a copyServiceAPI that has the org.copyservice. spi. Copy interface To use this service in a module, which module- info.java would be correct?
A)

B)

C)

D)

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

Answer: B

NEW QUESTION 90
Given:

Which two methods facilitate valid ways to read instance fields? (Choose two.)

A. getACount
B. getGCount
C. getCCount
D. getTotalCount
E. getTCount

Answer: C,D

NEW QUESTION 91
Given a Memberclass with fields for nameand yearsMembership, including getters and setters and a print method, and a list of clubMembersmembers:

Which two Stream methods can be changed to use method references? (Choose two.)

A. filter(Member::getYearsMembership() >= testMembershipLength)
B. peek(Member::print)
C. map(testName::compareToIgnoreCase)
D. filter(Integer::equals(0))

Answer: A,C

NEW QUESTION 92
Given:

Which statement is true?

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

Answer: B

NEW QUESTION 93
Given:

Which two are correct? (Choose two.)

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

Answer: A,C

NEW QUESTION 94
Given:

and omitting the throws FooException clause results in a compilation error.
Which statement is true about FooException?

A. The body of foo can throw FooException or one of its subclasses.
B. The body of foo can only throw FooException.
C. FooException is a subclass of RuntimeError.
D. FooException is unchecked.

Answer: A

NEW QUESTION 95
Given:

Which two constructors will compile and set the class field strings? (Choose two.)

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

Answer: B,E

NEW QUESTION 96
var numbers = List.of(0,1,2,3,4,5,6,7,8,9);
You want to calculate the average of numbers. Which two codes will accomplish this? (Choose two.)

A. double avg = numbers.stream().mapToInt (i -> i).average().parallel();
B. double avg = numbers.stream().average().getAsDouble();
C. double avg = numbers.stream().collect(Collectors.averagingDouble(n -> n));
D. double avg = numbers.stream().parallel().averagingDouble(a -> a);
E. double avg = numbers.parallelStream().mapToInt (m -> m).average().getAsDouble ();

Answer: B,E

Explanation: