Pass Your Oracle Java SE 1Z0-819 Exam Easily with Accurate PDF Questions [Nov 20, 2021]
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Oracle 1Z0-819 Exam Syllabus Topics:
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| Topic 2 |
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| Topic 3 |
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| Topic 5 |
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NEW QUESTION 125
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 126
Given:
Which three are correct? (Choose three.)
- A. f1.foo(li) prints Bonjour le monde!
- B. b1.foo(li) prints Hello world!
- C. f2.foo(li) prints Bonjour le monde!
- D. b1.foo(li) prints Bonjour le monde!
- E. f2.foo(li) prints Hola Mundo!
- F. f1.foo(li) prints Hello world!
- G. f2.foo(li) prints Hello world!
- H. b1.foo(li) prints Hola Mundo!
- I. f1.foo(li) prints Hola Mundo!
Answer: A,B,H
NEW QUESTION 127
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().parallel().averagingDouble(a > a);
- B. double avg = numbers.stream().mapToInt (i > i).average().parallel();
- C. double avg = numbers.stream().collect(Collectors.averagingDouble(n > n));
- D. double avg = numbers.parallelStream().mapToInt (m > m).average().getAsDouble ();
- E. double avg = numbers.stream().average().getAsDouble();
Answer: D,E
Explanation:
NEW QUESTION 128
Examine these module declarations:
Which two statements are correct? (Choose two.)
- A. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the
- B. The ServiceProvider module should export the com.myimpl package.
- C. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.
- D. The Consumer module should require the ServiceProvider module.
- E. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.
Answer: D,E
Explanation:
com.example.api API.
NEW QUESTION 129
And the code fragment:
Which situation will occur on code fragment execution?
- A. Starvation
- B. Race Condition
- C. Deadlock
- D. Livelock
Answer: A
NEW QUESTION 130
Given:
You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?
- A. Implement AutoCloseable and override the autoClose method.
- B. Extend AutoCloseable and override the close method.
- C. Extend AutoCloseable and override the autoClose method.
- D. Implement AutoCloseable and override the close method.
Answer: D
NEW QUESTION 131
Given:
Which code fragment on line 1 makes the m map contain the employee with the highest salary for each neighborhood?
A)
B)
C)
D)
- A. Option B
- B. Option C
- C. Option A
- D. Option D
Answer: D
NEW QUESTION 132
Given:
What is the result?
- A. The compilation fails at line 2.
- B. Hello World
- C. The compilation fails at line 8.
- D. The compilation fails at line 9.
Answer: B
Explanation:
NEW QUESTION 133
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 there is no zero args constructor defined in class X.
- C. The compilation succeeds.
- D. The compilation fails because a final class cannot extend another class.
Answer: A
Explanation:
NEW QUESTION 134
Which code fragment represents a valid Comparatorimplementation?
- A.
- B.
- C.
- D.
Answer: B
NEW QUESTION 135
Given the Customer table structure:
* ID Number Primary Key
* NAME Text Nullable
Given code fragment:
Which statement inserted on line 14 sets NAME column to a NULL value?
- A. Stmt.setNull(2, java,sql. Types, VARCHAR);
- B. Stmt.setNull(2 string, class);
- C. Stmt.setNull(2, java.lang, string);
- D. Stmt.setNull(2, null);
Answer: A
NEW QUESTION 136
Which three guidelines are used to protect confidential information? (Choose three.)
- A. Clearly identify and label confidential information.
- B. Treat user input as normal information.
- C. Encapsulate confidential information.
- D. Manage confidential and other information uniformly.
- E. Transparently handle information to improve diagnostics.
- F. Validate input before storing confidential information.
- G. Limit access to objects holding confidential information.
Answer: E,F,G
NEW QUESTION 137
Given:
What is the result?
- A. 3 5 3 3
- B. 5 5 3 3
- C. 3 5 3 5
- D. 3 3 3 3
Answer: A
Explanation:
NEW QUESTION 138
Given:
and
and
What is the result?
- A. A java.lang.NoSuchMethodExceptionis thrown.
- B. A java.lang.IllegalAccessExceptionis thrown.
- C. The compilation fails.
- D. The program prints Process()called 2.
- E. The program prints Process()called 1.
Answer: C
NEW QUESTION 139
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 140
Given:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: D
Explanation:
NEW QUESTION 141
Given the code fragment:
What is the result?
- A. 3 : 0
- B. 2 : -1
- C. -1 : 2
- D. 2 : 3
Answer: B
NEW QUESTION 142
Given:
What is the result?
- A. 0
- B. nothing
- C. 0 4 9
- D. 1
Answer: B
NEW QUESTION 143
Given:
Which two allow a.Main to allocate a new Person? (Choose two.)
- A. In Line 1, change the access modifier to privateprivate Person() {
- B. In Line 2, change the access modifier to protectedprotected class Main {
- C. In Line 2, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
- D. In Line 1, change the access modifier to publicpublic Person() {
- E. In Line 1, remove the access modifierPerson() {
Answer: C,D
NEW QUESTION 144
......
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