Practice on 2023 LATEST 1Z0-819 Exam Updated 262 Questions
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NEW QUESTION # 40
What is the result?
- A. 9001: APPLICATION ERROR-9001-MyFile.txt
9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt - B. 9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt
- C. Compilations fails at Line 1.
- D. 9001: APPLICATION ERROR-9001-MyFile.txt
Answer: C
NEW QUESTION # 41
Given:
You want to obtain the Stream object on reading the file. Which code inserted on line 1 will accomplish this?
- A. Stream<String> lines = Files.lines(INPUT_FILE_NAME);
- B. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- C. var lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
- D. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));
Answer: C
NEW QUESTION # 42
There is a copyServiceAPI that has the org.copyservice. spi. Copy interface To use this service in a module, which module- info.java would be correct?
A)
B)
C)
D)
- A. Option B
- B. Option A
- C. Option C
- D. Option D
Answer: C
NEW QUESTION # 43
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: C
NEW QUESTION # 44
Given:
After which line can we insert assert i < 0 || values[i] <= values[i + 1]; to verify that the values array is partially sorted?
- A. after line 5
- B. after line 6
- C. after line 8
- D. after line 10
Answer: B
Explanation:
NEW QUESTION # 45
Given:
Which annotation should be used to remove warnings from compilation?
- A. @SuppressWarnings("unchecked") on main and @SafeVarargs on the print method
- B. @SuppressWarnings("rawtypes") on main and @SafeVarargs on the print method
- C. @SuppressWarnings on the main and print methods
- D. @SuppressWarnings("all") on the main and print methods
Answer: A
Explanation:
NEW QUESTION # 46
Given the code fragment:
What is the result?
- A. 0
- B. The compilation fails at line
- C. 1
- D. The compilation fails at line 13.
- E. The compilation fails at line 16.
Answer: C
NEW QUESTION # 47
Given:
You want to use the myResource class in a try-with-resources statement. Which change will accomplish this?
- A. Extend AutoCloseable and override the close method.
- B. Extend AutoCloseable and override the autoClose method.
- C. Implement AutoCloseable and override the close method.
- D. Implement AutoCloseable and override the autoClose method.
Answer: C
NEW QUESTION # 48
Given this enum declaration:
Examine this code:
System.out.println(Alphabet.getFirstLetter());
What code should be written at line 3 to make this code print A?
- A. static String getFirstLetter() { return A.toString(); }
- B. static String getFirstLetter() { return Alphabet.values()[1].toString(); }
- C. final String getFirstLetter() { return A.toString(); }
- D. String getFirstLetter() { return A.toString(); }
Answer: A
NEW QUESTION # 49
Given:
What is the result?
- A. An exception is thrown at runtime.
- B. null
- C. Dr. Who
- D. Dr. Null
Answer: B
Explanation:
NEW QUESTION # 50
Examine these module declarations:
Which two statements are correct? (Choose two.)
- A. The ServiceProvider module should export the com.myimpl package.
- B. The placement of the com.example.api API in a separate module, ServiceAPI, makes it easy to install multiple provider modules.
- C. The ServiceProvider module is the only module that, at run time, can provide the com.example.api API.
- D. The Consumer module should require the ServiceProvider module.
- E. The ServiceProvider module does not know the identity of a module (such as Consumer) that uses the
Answer: C,D
Explanation:
com.example.api API.
NEW QUESTION # 51
Given:
You want to examine the items list it contains an item for which the variable count is below zero.
Which code fragment at line 1 accomplish this?
- A. If (items.stream () .filter (i -> count < 0) . findAny () ) {
- B. If (items.stream () .anymatch (i -> count < 0) < 0) ) {
- C. If (items.stream () .allmatch (i -> count < 0) < 0) ) {
- D. If (items.stream () .filter (i -> count < 0) . findFirst () ) {
Answer: D
NEW QUESTION # 52
Why would you choose to use a peekoperation instead of a forEachoperation on a Stream?
- A. to remove an item from the end of the stream
- B. to process the current item and return a stream
- C. to process the current item and return void
- D. to remove an item from the beginning of the stream
Answer: B
Explanation:
Explanation/Reference: https://www.baeldung.com/java-streams-peek-api
NEW QUESTION # 53
Consider this method declaration:
A) "SET SESSION AUTHORIZATION " + user
B) "SET SESSION AUTHORIZATION " + stmt.enquoteIdentifier(user)
Is A or B the correct replacement for <EXPRESSION> and why?
- A. B, because all values provided by the calling code should be enquoted.
- B. A, because it sends exactly the value of user provided by the calling code.
- C. A, because it is unnecessary to enclose identifiers in quotes.
- D. A and B are functionally equivalent.
- E. B, because enquoting values provided by the calling code prevents SQL injection.
Answer: B
NEW QUESTION # 54
Given:
It is required that if p instanceof Pairthen p.isValid()returns true.
Which is the smallest set of visibility changes to insure this requirement is met?
- A. setLeftand setRightmust be protected.
- B. left, right, setLeft, and setRightmust be private.
- C. isValidmust be public.
- D. leftand rightmust be private.
Answer: C
NEW QUESTION # 55
Given the code fragment:
What is the result?
- A. ab cd ef
- B. ad be cf
- C. An ArrayIndexOutOfBoundsException is thrown at runtime.
- D. The compilation fails.
- E. abc def
Answer: B
NEW QUESTION # 56
Given:
Which two lines of code when inserted in line 1 correctly modifies instance variables? (Choose two.)
- A. tCount = tCount;
- B. cCount = setCCount(c);
- C. setCCount(c) = cCount;
- D. aCount = a;
- E. setGCount(g);
Answer: A,D
NEW QUESTION # 57
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 Comparator<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 compareTo(Person person) {
return person.name.compareTo(this.name);
}
on line 2. - C. Insert Comparator<Person> on line 1.
Insert
public int compare(Person person) {
return person.name.compare(this.name);
}
on line 2. - D. Insert Comparable<Person> on line 1.
Insert
public int compare(Person p1, Person p2) {
return p1.name.compare(p2.name);
}
on line 2.
Answer: B
NEW QUESTION # 58
......
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