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Oracle 1Z0-819 (Java SE 11 Developer) Exam is a certification exam designed for Java developers who are looking to validate their skills and knowledge of Java programming language. 1z1-819 exam is the most recent version of Oracle's Java SE certification programs and is aimed at testing the candidate's proficiency in developing Java applications using the latest Java SE 11 features. Passing 1z1-819 exam demonstrates that the candidate has the necessary skills to develop robust and efficient Java applications for a variety of platforms.
NEW QUESTION # 157 
And the code fragment:
Which situation will occur on code fragment execution?
- A. Deadlock
- B. Starvation
- C. Livelock
- D. Race Condition
Answer: B
NEW QUESTION # 158
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.util.function.Function
- B. java.lang.Runnable
- C. java.util.function.Predicate
- D. java.util.concurrent.Callable
Answer: D
NEW QUESTION # 159
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. String toString() { return "200"; }
- C. public String toString() { return String.valueOf(Letter.values()[1]); }
- D. public String toString() { return String.valueOf(v); }
Answer: D
Explanation:
NEW QUESTION # 160
Given:
Which statement on line 1 enables this code to compile?
- A. Consumer function = (String f) -> (System.out.println(f);};
- B. Supplier function = () -> fruits.get (0);
- C. Function function = x -> x.substring(0,2);
- D. Predicate function = a -> a.equals("banana");
Answer: C
NEW QUESTION # 161
Given:
Path p1 = Paths.get("/scratch/exam/topsecret/answers");
Path p2 = Paths.get("/scratch/exam/answers/temp.txt");
Path p3 = Paths.get("/scratch/answers/topsecret");
Which two statements print ..\..\..\answers\topsecret? (Choose two.)
- A. System.out.print(p1.relativize(p2));
- B. System.out.print(p2.relativize(p3));
- C. System.out.print(p3.relativize(p1));
- D. System.out.print(p3.relativize(p2));
- E. System.out.print(p2.relativize(p1));
- F. System.out.print(p1.relativize(p3));
Answer: C,F
NEW QUESTION # 162
Given:
Which three classes successfully override showFirst ()?
A)
B)
C)
D)
E)
F)
- A. Option E
- B. Option B
- C. Option C
- D. Option F
- E. Option A
- F. Option D
Answer: C
NEW QUESTION # 163
Given:
Which is true?
- A. System.in cannot reassign the other stream.
- B. System.out is the standard output stream. The stream is open only when System.out is called.
- C. System.out is an instance of java.io.OutputStream by default.
- D. System.in is the standard input stream. The stream is already open.
Answer: D
NEW QUESTION # 164
Given these two classes:
And given this fragment:
Which describes the fragment?
- A. It is subject to deadlock.
- B. It throws IllegalMonitorStateException.
- C. It is subject to livelock.
- D. The code does not compile.
Answer: D
NEW QUESTION # 165
Given these two classes:
And given this fragment:
Which describes the fragment?
- A. It is subject to deadlock.
- B. It throws IllegalMonitorStateException.
- C. It is subject to livelock.
- D. The code does not compile.
Answer: D
NEW QUESTION # 166
Given:
What is required to make the Foo class thread safe?
- A. No change is required.
- B. Move the declaration of lock inside the foo method.
- C. Replace the lock constructor call with new ReentrantLock (true).
- D. Make the declaration of lock static.
Answer: C
Explanation:
Reference:
/how-to-make-java-class-thread-safe
NEW QUESTION # 167
Given:
Which two codes, independently, can be inserted in line to 1 compile?
- A. Abacus aba = (int i, j) -> ( return i * j; };
- B. Abacus aba = (a, b) -> a * b;
- C. Abacus aba = (int e, int f) -> { return e * f; };
- D. Abacus aba = v, w -> x * y;
- E. Abacus aba = (int m, int n) -> { m * n };
Answer: A,B
NEW QUESTION # 168
Given:
You want the code to produce this output:
John
Joe
Jane
Which code fragment should be inserted on line 1 and line 2 to produce the output?
- A. Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2. - B. Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2. - C. Insert Comparator<Person> on line 1.
Insert
public int compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2. - D. Insert Comparator<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.
Answer: C
NEW QUESTION # 169
Given the code fragment:
You must define the A exception class. The program execution must be terminated if the condition at line 19 is true and an a exception is thrown at line 20.
Which code fragment at line n1 defines A as per the requirement?
- A. Class A extends Throwable {
- B. Class A extends Exception {
- C. Class A extends RuntimeException {
- D. Class A extends ArithmeticException {
Answer: B
NEW QUESTION # 170
Given:
What is the output?
- A. A NoSuchElementException is thrown at run time.
- B. null
- C. Duke
- D. A NullPointerException is thrown at run time.
Answer: C
Explanation:
NEW QUESTION # 171
Given the code fragment:
Which can replace line 2?
- A. UnaryOperator u = i -> { return i * 2);
- B. UnaryOperator u = (var i) -> (i * 2);
- C. UnaryOperator u = (int i) -> i * 2;
- D. UnaryOperator u = var i -> { return i * 2; };
Answer: B
NEW QUESTION # 172
Given:
and
checkQuality(QUALITY.A);
and
Which code fragment can be inserted into the switch statement to print Best?
- A. QUALITY.A.ValueOf()
- B. A
- C. QUALITY.A
- D. A.toString()
Answer: B
NEW QUESTION # 173
Given:
You want to calculate the average of the Player's score.
Which statement inserted on line 1 will accomplish this?
- A. players.stream().map(a -> a.score).average();
- B. players.stream().average().orElse(0.0);
- C. players.stream().mapToInt(a -> a.score).average().orElse(0.0);
- D. players.stream().mapToDouble(a -> a.score).average();
Answer: C
NEW QUESTION # 174
Why does this compilation fail?
- A. The method Y. print (object...) cannot override the final method x.print (object....).
- B. In method x. print (Collection), system. Out :: prints is an invalid Java identifier.
- C. The method print (object) and the method print (object...) are duplicates of each other.
- D. The method x. print (object) is not accessible to Y.
- E. The method Y. print (object) does not call the method super.print (object)
Answer: C
NEW QUESTION # 175
Given:
What is the result?
- A. nothing
- B. 0
- C. 5 4 3 2 1
- D. 5 4 3 2 1 4 3 2 1 3 2 1 2 1 1
Answer: A
Explanation:
Explanation
Graphical user interface, application Description automatically generated
NEW QUESTION # 176
What change will cause the code to compile successfully?
- A. Insert PriceChecker <Plushy extends Products> prod on line 1.
- B. Insert PriceChecker <> prod on line 1.
- C. Insert PriceChecker <Electronics> prod on line 1.
- D. Insert PriceChecker (?) prod on line 1.
Answer: D
NEW QUESTION # 177
Given:
What is the result?
- A. 1.99,2.99
- B. The compilation fails.
- C. 1.99,2.99,0.0
- D. 1.99,2.99,0
Answer: C
NEW QUESTION # 178
Given:
Which two lines can replace line 1 so that the Y class compiles? (Choose two.)
- A. set(map.values());
- B. super.set(List<String> map)
- C. super.set(map.values());
- D. set(map)
- E. map.forEach((k, v) -> set(v)));
Answer: A,C
NEW QUESTION # 179
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 # 180
Given this requirement:
Module vehicle depends on module part and makes its com.vehicle package available for all other modules.
Which module-info.java declaration meets the requirement?
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: C
NEW QUESTION # 181
......
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