2023 Updated Oracle 1Z0-819 Dumps PDF - Want To Pass 1Z0-819 Fast
1Z0-819 Practice Exam Dumps - 99% Marks In Oracle Exam
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Difficulty in Attempting Java SE 11 Developer Exam Number: 1Z0-819
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Questions in the certification examination are based on the real-world scenarios and cater to the real-time problems implementation difficulties, hence along with all the training material and tutorial it is of utmost importance for the candidate to possess practical knowledge and experience of working in the field of Java technology.
NEW QUESTION 11
Given:
Which two statements are valid to be written in this interface? (Choose two.)
- A. public String methodD();
- B. final void methodE();
- C. final void methodG(){System.out.println("G");}
- D. private abstract void methodC();
- E. public int x;
- F. public abstract void methodB();
- G. public void methodF(){System.out.println("F");}
Answer: A,F
NEW QUESTION 12
Given:
and
Which two method definitions at line n1 in the Bar class compile? (Choose two.)
- A. public List<Integer> foo(TreeSet<String> m) {...}
- B. public List<Object> foo(Set<CharSequence> m) {...}
- C. public List<Integer> foo(Set<CharSequence> m) {...}
- D. public ArrayList<Number> foo(Set<CharSequence> m) {...}
- E. public ArrayList<Integer> foo(Set<String> m) {...}
- F. public List<Number> foo(Set<String> m) {...}
Answer: A,D
NEW QUESTION 13
Given:
Which is true?
- A. The code throws an exception at runtime.
- B. The code prints 25.
- C. The code does not compile.
- D. The code compiles but does not print any result.
Answer: C
NEW QUESTION 14
Given:
What is the output?
- A. 0
- B. 1
- C. 2
- D. Exception
Answer: B
Explanation:
NEW QUESTION 15
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option B
- B. Option A
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 16
Given:
What is the result?
- A. 1.99,2.99,0.0
- B. 1.99,2.99,0
- C. The compilation fails.
- D. 1.99,2.99
Answer: C
Explanation:
NEW QUESTION 17
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(Integer::equals(0))
- B. filter(Member::getYearsMembership() >= testMembershipLength)
- C. peek(Member::print)
- D. map(testName::compareToIgnoreCase)
Answer: B,D
NEW QUESTION 18
Given:
What is the result?
- A. Value of Euler = 2.71828
- B. Value of Euler = "2.71828"
- C. It throws a runtime exception.
- D. The code does not compile.
Answer: D
NEW QUESTION 19
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().parallel().averagingDouble(a > a);
- D. double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));
- E. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();
Answer: B,E
Explanation:
NEW QUESTION 20
Which code fragment compiles?
- A. Option B
- B. Option A
- C. Option C
- D. Option D
Answer: D
Explanation:
NEW QUESTION 21
Given:
What is the result?
- A. 0
- B. nothing
- C. 0 4 9
- D. 1
Answer: B
NEW QUESTION 22
Given:
What is the result?
- A. Hello
- B. NullPointerException is thrown at line 10.
- C. A compilation error occurs.
- D. NullPointerException is thrown at line 4.
Answer: A
Explanation:
NEW QUESTION 23
Given:
public class X {
}
and
public final class Y extends X {
}
What is the result of compiling these two classes?
- A. The compilation fails because either class X or class Y needs to implement the toString() method.
- B. The compilation fails because a final class cannot extend another class.
- C. The compilation fails because there is no zero args constructor defined in class X.
- D. The compilation succeeds.
Answer: A
Explanation:
NEW QUESTION 24
Given:
What is the result?
- A. Good Morning, Harry
- B. Good Morning, Potter
- C. Good Night, Harry
- D. Good Night, Potter
Answer: D
Explanation:
NEW QUESTION 25
Given:
Which three classes successfully override showFirst ()?
A)
B)
C)
D)
E)
F)
- A. Option B
- B. Option A
- C. Option E
- D. Option C
- E. Option D
- F. Option F
Answer: D
NEW QUESTION 26
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 AtomicInteger count = new AtomicInteger(0);and replace line 3 with test.count.incrementAndGet();
- B. replace line 2 with public static synchronized void main(String[] args) {
- C. replace line 1 with private volatile int count = 0;
- D. replace line 3 with
synchronized(test.count) {
test.count++;
} - E. replace line 3 with
synchronized(test) {
test.count++;
}
Answer: A,D
Explanation:
Explanation/Reference: https://stackoverflow.com/questions/15852123/java-thread-safe-counter/15852164
NEW QUESTION 27
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