[Dec-2021] Oracle 1Z0-819 Exam: Basic Questions With Answers
New 2021 Realistic Free Oracle 1Z0-819 Exam Dump Questions & Answer
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How much Java SE 11 Developer Exam Number: 1Z0-819 costs
- Passing Score: 60% or higher
- Examination Name: Java SE 11 Developer Exam Number: 1Z0-819
- No. of Questions: 60 Questions
- Length of Exam: 85 min
- Examination Fees: $250 USD
- Types of questions: Performance Based Questions
NEW QUESTION 115
Your organization makes mlib.jar available to your cloud customers. While working on a code cleanup project for mlib.jar, you see this method by customers:
What security measures should be added to this method so that it meets the requirements for a customer accessible method?
- A.
- B. Create a method that validates the hostName and portNumber parameters before opening the socket.
- C. Enclose the call to new Socket In an AccessController.doPrivileged block.
- D. Make enableService private.
Answer: C
NEW QUESTION 116
Given:
Assuming that this code compiles correctly, which three statements are true? (Choose three.)
- A. A is a subtype of B.
- B. A cannot be abstract.
- C. B cannot be final.
- D. B is a subtype of A.
- E. B cannot be abstract.
- F. A cannot be final.
Answer: D,E,F
NEW QUESTION 117
Which two safely validate inputs? (Choose two.)
- A. Modify the input values, as needed, to pass validation.
- B. Delegate numeric range checking of values to the database.
- C. Accept only valid characters and input values.
- D. Use trusted domain-specific libraries to validate inputs.
- E. Assume inputs have already been validated.
Answer: B,C
NEW QUESTION 118
Given the code fragment:
What is the result?
A)
B)
C)
D)
- A. Option A
- B. Option B
- C. Option C
- D. Option D
Answer: C
NEW QUESTION 119
Given:
What is the result?
- A. Map: 0 Keys: 0 Values: 0
- B. Map: 0 Keys: 4 Values: 4
- C. Map: 4 Keys: 4 Values: 4
- D. Map: 4 Keys: 0 Values: 0
- E. The compilation fails.
Answer: D
Explanation:
NEW QUESTION 120
Given:
Assume the file on path does not exist. What is the result?
- A. The compilation fails.
- B. /u01/work/filestore.txt is not deleted.
- C. Exception
- D. /u01/work/filestore.txt is deleted.
Answer: A
Explanation:
NEW QUESTION 121
Given:
Which two independent changes will make the Main class compile? (Choose two.)
- A. Change line 1 to public class Student {.
- B. Change line 3 to Student student = new Student("Biology");.
- C. Change line 2 to public Student(String classname).
- D. Move the entire Student class declaration to a separate Java file, Student.java.
- E. Change line 1 to static class Student {.
Answer: B,C
Explanation:
NEW QUESTION 122
Given:
What is the result?
- A. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
- B. Orange Juice
- C. The compilation fails.
- D. The program prints nothing.
Answer: A
Explanation:
NEW QUESTION 123
Given:
What is the result?
- A. 0 4 9
- B. 0
- C. 1
- D. nothing
Answer: D
NEW QUESTION 124
Given the code fragment:
Path source = Paths.get("/repo/a/a.txt");
Path destination = Paths.get("/repo");
Files.move(source, destination); // line 1
Files.delete (source); // line 2
Assuming the source file and destination folder exist, what Is the result?
- A. A java.nio.file.NoSuchFileException is thrown on line 2.
- B. A copy of /repo/a/a.txt is moved to the /repo directory and /repo/a/a.txt is deleted.
- C. a.txt is renamed repo.
- D. A java.nio.file.FileAlreadyExistsException is thrown on line 1.
Answer: B
NEW QUESTION 125
Given:
What is the result?
- A. abd
- B. adf
- C. abdf
- D. abcd
- E. The compilation fails.
Answer: D
NEW QUESTION 126
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, add extends Person to the Main classpublic class Main extends Person {and change Line 3 to create a new Main objectPerson person = new Main();
- C. In Line 1, change the access modifier to publicpublic Person() {
- D. In Line 2, change the access modifier to protectedprotected class Main {
- E. In Line 1, remove the access modifierPerson() {
Answer: B,C
NEW QUESTION 127
Given:
What is the expected result of javac?
- A. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
- B. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: expected import java.lang
- C. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
- D. javac compiles Mycar.java without errors or warnings.
Answer: D
NEW QUESTION 128
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. set(map)
- D. map.forEach((k, v) -> set(v)));
- E. super.set(map.values());
Answer: A,E
NEW QUESTION 129
Given:
Which statement is equivalent to line 1?
- A. double totalSalary = list.stream().mapToDouble(e > e.getSalary() * ratio).sum;
- B. double totalSalary = list.stream().map(e > e.getSalary() * ratio).reduce (bo).ifPresent (p > p.doubleValue());
- C. double totalSalary = list.stream().mapToDouble(e > e.getSalary() * ratio).reduce(starts, bo);
- D. double totalSalary = list.stream().map(Employee::getSalary * ratio).reduce (bo).orElse(0.0);
Answer: D
Explanation:
NEW QUESTION 130
Which module-info.java is correct for a service provider for a print service defined in the PrintServiceAPI module?
module PrintServiceProvider {
- A. requires PrintServiceAPI;
uses com.provider.PrintService;
}
module PrintServiceProvider { - B. requires PrintServiceAPI;
exports org.printservice.spi.Print with
com.provider.PrintService;
} - C. requires PrintServiceAPI;
exports org.printservice.spi;
}
module PrintServiceProvider { - D. requires PrintServiceAPI;
provides org.printservice.spi.Print with
com.provider.PrintService;
}
module PrintServiceProvider {
Answer: C
NEW QUESTION 131
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 p1, Person p2) {
return p1.name.compare(p2.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 person) {
return person.name.compare(this.name);
}
on line 2.
Answer: C
NEW QUESTION 132
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 A
- B. Option C
- C. Option B
- D. Option D
Answer: D
NEW QUESTION 133
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. set(map)
- D. map.forEach((k, v) -> set(v)));
- E. super.set(map.values());
Answer: A,E
NEW QUESTION 134
......
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