Pass Guaranteed Quiz 2025 Realistic Verified Free 1z1-819 Exam Dumps [Q37-Q61]

Pass Guaranteed Quiz 2025 Realistic Verified Free 1z1-819 Exam Dumps

Free Oracle Java SE 1z1-819 Ultimate Study Guide (Updated 297 Questions)

NEW QUESTION # 37
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 Comparable<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 compare(Person person) {
  return person.name.compare(this.name);
  }
  on line 2.
• D. Insert Comparator<Person> on line 1.
  Insert
  public int compareTo(Person person) {
  return person.name.compareTo(this.name);
  }
  on line 2.

Answer: D

NEW QUESTION # 38
Assuming the Widget class has a getPrice method, this code does not compile:

Which two statements, independently, would allow this code to compile? (Choose two.)

• A. Replace line 5 with widgetStream.filter(a -> ((Widget)a).getPrice() > 20.00).
• B. Replace line 5 with widgetStream.filter((Widget a) -> a.getPrice() > 20.00).
• C. Replace line 1 with List<Widget> widgetStream = widgets.stream();.
• D. Replace line 4 with Stream<Widget> widgetStream = widgets.stream();.

Answer: A,D

NEW QUESTION # 39
Given:

What is the result?

• A. [A, B, C]
  [A, B]
• B. On line 9, an exception is thrown at run time.
• C. [A, B, C]
  followed by an exception thrown on line 11.
• D. [A, B, C]
  [A, B, C]

Answer: D

Explanation:
Explanation
Graphical user interface, text, application Description automatically generated

NEW QUESTION # 40
Given:

What is the result?

• A. 0
• B. 1
• C. 2
• D. 3
• E. 4

Answer: D

NEW QUESTION # 41
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("all") on the main and print methods
• D. @SuppressWarnings on the main and print methods

Answer: A

Explanation:

NEW QUESTION # 42
Given:

Which statement is true?

• A. The code fails to compile as try-try-resource needs a variable declaration such as MyResource r1= res1; MyResource r2 = res2;.
• B. The code fails to compile as res2 should be declared as final.
• C. The code fails to compile as MyResource must implement Closeable.
• D. The code compiles successfully.

Answer: D

NEW QUESTION # 43
Given:

and the code fragment:

What is the result?
9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt

• A.
• B. Compilations fails at Line 1.
• C. 9001: java.io.FileNotFoundException: MyFile.txt-MyFile.txt
  9001: APPLICATION ERROR-9001-MyFile.txt
• D. 9001: APPLICATION ERROR-9001-MyFile.txt

Answer: B

NEW QUESTION # 44
Which two expressions create a valid Java Path instance? (Choose two.)

• A. Paths.get("foo")
• B. new Path("foo")
• C. Paths.get(URL.create("file:///domains/oracle/test.txt"))
• D. Path.get(new URI("file:///domains/oracle/test.txt"))
• E. Paths.getPath("too")

Answer: A,C

NEW QUESTION # 45

Why does this compilation fail?

• A. The method Y. print (object...) cannot override the final method x.print (object....).
• B. The method Y. print (object) does not call the method super.print (object)
• C. In method x. print (Collection), system. Out :: prints is an invalid Java identifier.
• D. The method print (object) and the method print (object...) are duplicates of each other.
• E. The method x. print (object) is not accessible to Y.

Answer: D

NEW QUESTION # 46
Given:

This code results in a compilation error.
Which code should be inserted on line 1 for a successful compilation?

• A. Consumer consumer = var arg -> {System.out.print(arg);};
• B. Consumer consumer = System.out::print;
• C. Consumer consumer = (String args) -> System.out.print(args);
• D. Consumer consumer = msg -> { return System.out.print(msg); };

Answer: B

Explanation:

NEW QUESTION # 47
Given:

Which is true?

• A. The code throws an exception at runtime.
• B. The code compiles but does not print any result.
• C. The code does not compile.
• D. The code prints 25.

Answer: C

NEW QUESTION # 48
Given:

and:

Which code, when inserted on line 10, prints the number of unique localities from the roster list?

• A. .map(Employee::getLocality)
  .distinct()
  .count();
• B. map(e > e.getLocality())
  .count();
• C. .map(e > e.getLocality())
  .collect(Collectors.toSet())
  .count();
• D. .filter(Employee::getLocality)
  .distinct()
  .count();

Answer: D

NEW QUESTION # 49
Given:

Which loop incurs a compile time error?

• A. the loop starting line 14
• B. the loop starting line 11
• C. the loop starting line 3
• D. the loop starting line 7

Answer: A

NEW QUESTION # 50
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.readAllLines(Paths.get(INPUT_FILE_NAME));
• B. Stream<String> lines = Files.lines(INPUT_FILE_NAME);
• C. Stream lines = Files.readAllLines(Paths.get(INPUT_FILE_NAME));
• D. var lines = Files.lines(Paths.get(INPUT_FILE_NAME));

Answer: A

NEW QUESTION # 51
Given:

Which two interfaces can be used in lambda expressions? (Choose two.)

• A. MyInterface2
• B. MyInterface4
• C. MyInterface5
• D. MyInterface1
• E. MyInterface3

Answer: A,C

NEW QUESTION # 52
Assume ds is a DataSource and the EMP table is defined appropriately.

What does executing this code fragment do?

• A. throws a SQLException
• B. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', NULL)
• C. inserts two rows (101, 'SMITH', 'HR') and (102, 'JONES', 'HR')
• D. inserts one row (101, 'SMITH', 'HR')

Answer: D

NEW QUESTION # 53
Given:

Which two lines can replace line 1 so that the Y class compiles? (Choose two.)

• A. super.set(List<String> map)
• B. super.set(map.values());
• C. map.forEach((k, v) -> set(v)));
• D. set(map.values());
• E. set(map)

Answer: B,D

NEW QUESTION # 54
Given the code fragment:

Which can replace line 2?

• A. UnaryOperator u = var i -> { return i * 2; };
• B. UnaryOperator u = (var i) -> (i * 2);
• C. UnaryOperator u = i -> { return i * 2);
• D. UnaryOperator u = (int i) -> i * 2;

Answer: B

NEW QUESTION # 55
Given the code fragment:

What is the result?

• A. 2 : 3
• B. -1 : 2
• C. 2 : -1
• D. 3 : 0

Answer: C

NEW QUESTION # 56
Which three initialization statements are correct? (Choose three.)

• A. String contact# = "(+2) (999) (232)";
• B. int x = 12_34;
• C. int[][][] e = {{1,1,1},{2,2,2}};
• D. byte b = 10;
  char c = b;
• E. boolean false = (4 != 4);
• F. float x = 1f;
• G. short sh = (short)'A';

Answer: B,F,G

NEW QUESTION # 57
Given:

It is required that if p instanceof Pair then p.isValid() returns true.
Which is the smallest set of visibility changes to insure this requirement is met?

• A. isValid must be public.
• B. left, right, setLeft, and setRight must be private.
• C. left and right must be private.
• D. setLeft and setRight must be protected.

Answer: C

NEW QUESTION # 58
Given:

Which three classes successfully override showFirst ()?
A)

B)

C)

D)

E)

F)

• A. Option D
• B. Option E
• C. Option C
• D. Option B
• E. Option A
• F. Option F

Answer: C

NEW QUESTION # 59
Given:
jdeps -jdkinternals C:\workspace4\SimpleSecurity\jar\classes.jar
Which describes the expected output?

• A. jdeps lists the module dependencies and the package names of all referenced JDK internal APIs. If any are found, the suggested replacements are output in the console.
• B. The -jdkinternals option analyzes all classes in the .jar and prints all class-level dependencies.
• C. The -jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.
• D. jdeps outputs an error message that the -jdkinternals option requires either the -summary or the - verbose options to output to the console.

Answer: C

Explanation:
-jdkinternals option analyzes all classes in the .jar for class-level dependencies on JDK internal APIs. If any are found, the results with suggested replacements are output in the console.

NEW QUESTION # 60
Given:

Which statement is true about the Fox class?

• A. Fox class must implement either Forest or Town interfaces, but not both.
• B. Fox class does not have to override the inhabit method if Forest and Town provide compatible implementations.
• C. Fox class does not have to override inhabit method, so long as it does not try to call it.
• D. Fox class must provide implementation for the inhabit method.
• E. The inhabit method implementation from the first interface that Fox implements will take precedence.

Answer: B

NEW QUESTION # 61
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