[Feb 06, 2022] 1z1-819 Practice Exam Dumps - 99% Marks In Oracle Exam
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Certification Path for Java SE 11 Developer Exam Number: 1Z0-819
Java SE 11 Developer Exam Number: 1Z0-819 is a fundamental exam. Successful completion by candidates will allow them to achieve Oracle Certified Professional: Java SE 11 Developer.
NEW QUESTION 79
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. map(testName::compareToIgnoreCase)
- B. filter(Integer::equals(0))
- C. filter(Member::getYearsMembership() >= testMembershipLength)
- D. peek(Member::print)
Answer: A,C
NEW QUESTION 80
Given:
What is the result?
- A. abdf
- B. adf
- C. abd
- D. abcd
- E. The compilation fails.
Answer: D
NEW QUESTION 81
Which is a proper JDBC URL?
- A. http://localhost
mysql.jdbc:3306/database - B. http://localhost.mysql.com:3306/database
- C. jdbe.mysql.com://localhost:3306/database
- D. jdbc:mysql://localhost:3306/database
Answer: D
NEW QUESTION 82
Given:
and:
Which code, when inserted on line 10, prints the number of unique localities from the roster list?
- A. .map(e -> e.getLocality())
.collect(Collectors.toSet())
.count(); - B. .filter(Employee::getLocality)
.distinct()
.count(); - C. map(e -> e.getLocality())
.count(); - D. .map(Employee::getLocality)
.distinct()
.count();
Answer: B
NEW QUESTION 83
Given:
What is the result?
- A. abdf
- B. adf
- C. abd
- D. abcd
- E. The compilation fails.
Answer: D
NEW QUESTION 84
Given:
What is required to make the Foo class thread safe?
- A. Replace the lock constructor call with new ReentrantLock (true).
- B. Move the declaration of lock inside the foo method.
- C. No change is required.
- D. Make the declaration of lock static.
Answer: A
Explanation:
Reference:
/how-to-make-java-class-thread-safe
NEW QUESTION 85
Given:
List<String> list1 = new ArrayList<>();
list1.add("A");
list1.add("B");
List list2 = List.copyOf(list1);
list2.add("C");
List<List<String>> list3 = List.of(list1, list2);
System.out.println(list3);
What is the result?
- A. An exception is thrown at run time.
- B. [[A, B],[A, B]]
- C. [[A, B], [A, B, C]]
- D. [[A, B, C], [A, B, C]]
Answer: A
Explanation:
NEW QUESTION 86
A bookstore's sales are represented by a list of Sale objects populated with the name of the customer and the books they purchased.
public class Sale {
private String customer;
private List<Book> items;
// constructor, setters and getters not shown
}
public class Book {
private String name;
private double price;
// constructor, setters and getters not shown
}
Given a list of Sale objects, tList, which code fragment creates a list of total sales for each customer in ascending order?
- A. Option C
- B. Option D
- C. Option B
- D. Option A
Answer: A
NEW QUESTION 87
Given:
What is the result?
- A. 3 3 3 3
- B. 5 5 3 3
- C. 3 5 3 3
- D. 3 5 3 5
Answer: C
Explanation:
NEW QUESTION 88
Given an application with a main module that has this module-info.java file:
Which two are true? (Choose two.)
- A. A module providing an implementation of country.CountryDetails can be compiled and added without recompiling the main module.
- B. An implementation of country.countryDetails can be added to the main module.
- C. To run without an error, the application must have at least one module in the module path that provides an implementation of country.CountryDetails.
- D. A module providing an implementation of country.CountryDetails must have a requires main; directive in its module-info.java file.
- E. To compile without an error, the application must have at least one module in the module source path that provides an implementation of country.CountryDetails.
Answer: D,E
Explanation:
Reference:
/java-9-error-not-in-a-module-on-the-module-source- path
NEW QUESTION 89
Given:
What is the result?
- A. 0
- B. The compilation fails due to an error in line 4.
- C. The compilation fails due to an error in line 5.
- D. 1
- E. The compilation fails due to an error in line 3.
- F. The compilation fails due to an error in line 1.
- G. The compilation fails due to an error in line 2.
Answer: A
NEW QUESTION 90
Which method throws an exception for not-a-number and infinite input values?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option B
- D. Option A
Answer: D
NEW QUESTION 91
Given the code fragment:
You must make the countvariable thread safe.
Which two modifications meet your requirement? (Choose two.)
- A. replace line 1 with private volatile int count = 0;
- B. replace line 3 with
synchronized(test) {
test.count++;
} - C. replace line 3 with
synchronized(test.count) {
test.count++;
} - D. replace line 2 with public static synchronized void main(String[] args) {
- E. replace line 1 with private AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
Answer: C,E
Explanation:
Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164
NEW QUESTION 92
Given:
What is the output?
- A. A NoSuchElementException is thrown at run time.
- B. null
- C. A NullPointerException is thrown at run time.
- D. Duke
Answer: D
Explanation:
NEW QUESTION 93
Given:
What is the result?
- A. Unknown
- B. Working
- C. TuesdayUnknown
- D. WorkingUnknown
- E. Tuesday
- F. The compilation fails.
Answer: A
Explanation:
NEW QUESTION 94
Given:
Which two statements can be added at line 1 in Bar to successfully compile it? (Choose two.)
- A. public List<Integer> foo(TreeSet<String> m) { ... }
- B. public List<Integer> foo(Set<String> m) { ... }
- C. public List<Integer> foo(Set<CharSequence> m) { ... }
- D. public List<Object> foo(Set<CharSequence> m) { ... }
- E. public ArrayList<Integer> foo(Set<String> m) { ... }
- F. public ArrayList<Number> foo(Set<CharSequence> m) { ... }
Answer: A,F
NEW QUESTION 95
......
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