Oct 18, 2021 Step by Step Guide to Prepare for 1Z0-819 Exam BrainDumps
Oracle Java SE 1Z0-819 Real Exam Questions and Answers FREE Updated on 2021
NEW QUESTION 56
Given:
What is the expected result of javac?
- A. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error: package java does not exist
- B. javac fails to compile the class and prints the error message, C:\workspace4\Mycar.java:1:error:
expected import java.lang - C. javac compiles Mycar.java without errors or warnings.
- D. javac fails to compile the class and prints the error message, Error: Could not find or load main class Mycar.class
Answer: C
NEW QUESTION 57
Given:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION 58
A company has an existing sales application using a Java 8 jar file containing packages:
com.company.customer;
com.company.customer.orders;
com.company.customer.info;
com.company.sales;
com.company.sales.leads;
com.company.sales.closed;
com.company.orders;
com.company.orders.pending;
com.company.orders.shipped.
To modularize this jar file into three modules, customer, sales, and orders, which module-info.java would be correct?
A)
B)
C)
D)
- A. Option D
- B. Option C
- C. Option A
- D. Option B
Answer: B
NEW QUESTION 59
Which set of commands is necessary to create and run a custom runtime image from Java source files?
- A. java, jdeps
- B. javac, jar
- C. javac, jlink
- D. jar, jlink
Answer: C
NEW QUESTION 60
Given:
and omitting the throws FooException clause results in a compilation error.
Which statement is true about FooException?
- A. The body of foo can throw FooException or one of its subclasses.
- B. The body of foo can only throw FooException.
- C. FooException is a subclass of RuntimeError.
- D. FooException is unchecked.
Answer: A
NEW QUESTION 61
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(Member::getYearsMembership() >= testMembershipLength)
- B. peek(Member::print)
- C. map(testName::compareToIgnoreCase)
- D. filter(Integer::equals(0))
Answer: A,C
NEW QUESTION 62
Given:
Assume the file on path does not exist. What is the result?
- A. /u01/work/filestore.txt is not deleted.
- B. Exception
- C. The compilation fails.
- D. /u01/work/filestore.txt is deleted.
Answer: C
Explanation:
NEW QUESTION 63
Given:
You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?
- A. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
- B. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- C. Stream<String> lines = Files.lines(INPUT_FILE_NAME);
- D. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
Answer: B
NEW QUESTION 64
Given:
and
What is the result?
- A. 1
1
1 - B. The compilation fails.
- C. A NullPointerException is thrown at run time.
- D. 1
Null
null - E. A ClassCastException is thrown at run time.
Answer: B
Explanation:
NEW QUESTION 65
Examine this excerpt from the declaration of the java.se module:
What does the transitive modifier mean?
- A. Any module that attempts to require the java.se module actually requires the java.sql module instead.
- B. Any module that requires the java.sql module does not need to require the java.se module.
- C. Only a module that requires the java.se module is permitted to require the java.sql module.
- D. Any module that requires the java.se module does not need to require the java.sql module.
Answer: C
NEW QUESTION 66
Given:
What is the result?
- A. The compilation fails.
- B. Orange Juice
- C. Orange Juice Apple Pie Lemmon Ice Raspberry Tart
- D. The program prints nothing.
Answer: C
Explanation:
NEW QUESTION 67
Given the code fragment:
Which action enables Computatorclass to compile?
- A. change Line 4 to for (Double n : collection) {
- B. change Line 2 to public Double sum ( C collection) {
- C. change Line 5 to List<Double> numbers = List.of(5, 4, 6, 3, 7, 2, 8, 1, 9);
- D. change Line 3 to Double sum = 0.0;
- E. change Line 1 to add throws NumberFormatException
Answer: B
NEW QUESTION 68
Given:
Which is true about line 1?
- A. If the value is not present, nothing is done.
- B. If the value is not present, a NoSuchElementException is thrown at run time.
- C. If the value is not present, a NullPointerException is thrown at run time.
- D. It always executes the System.out::print statement.
Answer: A
Explanation:
NEW QUESTION 69
Which two safely validate inputs? (Choose two.)
- A. Accept only valid characters and input values.
- B. Use trusted domain-specific libraries to validate inputs.
- C. Delegate numeric range checking of values to the database.
- D. Assume inputs have already been validated.
- E. Modify the input values, as needed, to pass validation.
Answer: A,C
NEW QUESTION 70
Given:
What action ensures successful compilation?
- A. Replace enum Color with public enum Color.
- B. Replace public Color(int c) with private Color(int c).
- C. Replace int c; with private int c;.
- D. Replace int c; with private final int c;.
- E. Replace enum Color implements Serializable with public enum Color.
Answer: B
Explanation:
NEW QUESTION 71
Given:
What is the result?
- A. JoeMarry
- B. nullMary
- C. nullnull
- D. Joenull
Answer: B
Explanation:
NEW QUESTION 72
Which statement about a functional interface is true?
- A. It is declared with a single abstract method.
- B. It must be annotated with @FunctionalInterface.
- C. It cannot have any private methods and static methods.
- D. It is declared with a single default method.
- E. It must be defined with the public access modifier.
Answer: A
NEW QUESTION 73
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