Verified 1z1-809 dumps Q&As - Pass Guarantee or Full Refund [Mar-2026]

1z1-809 PDF Dumps | Mar 03, 2026 Recently Updated Questions 

To prepare for the Oracle 1z1-809 certification exam, candidates should have a thorough understanding of the Java language and programming skills. It is recommended to have hands-on experience in developing Java applications. There are several study resources available, including certification guides, practice tests, and online courses. By using these resources, candidates can strengthen their skills and knowledge before taking the exam.

The 1z0-809 exam covers a wide range of topics related to Java SE 8, including Lambda expressions, streams, concurrency, JDBC, and more. 1z1-809 exam is designed to test the candidate's understanding of these advanced topics and their ability to apply them in practical programming scenarios. Passing 1z1-809 exam is a testament to the candidate's expertise in Java programming and can help them stand out in a competitive job market.

 

NEW QUESTION # 73
Given:

Which is refactored code with functional interfaces?

• A.
• B.
• C.
• D.

Answer: D

NEW QUESTION # 74
Given:
public interface Moveable<Integer> {
public default void walk (Integer distance) {System.out.println("Walking");) public void run(Integer distance);
}
Which statement is true?

• A. Movable cannot be used in a lambda expression.
• B. Moveable can be used as below:
  Moveable<Integer> animal = n - > System.out.println("Running" + n);
  animal.run(100);
  animal.walk(20);
• C. Moveable can be used as below:
  Moveable animal = (Integer n) - > System.out.println(n);
  animal.run(100);
  Moveable.walk(20);
• D. Moveable can be used as below:
  Moveable<Integer> animal = n - > n + 10;
  animal.run(100);
  animal.walk(20);

Answer: B

NEW QUESTION # 75
Given the information: The employee table has 10 records.
Given the code fragment:

What is the result?

• A. throws a runtime exception at Line n1
• B. deletes the second row and prints the emp_id of the first row
• C. deletes the first row and throws an exception at Line n2
• D. deletes the first row and prints the emp_id of the second row

Answer: C

NEW QUESTION # 76
Given the code fragment:
List<Integer> list1 = Arrays.asList(10, 20);
List<Integer> list2 = Arrays.asList(15, 30);
//line n1
Which code fragment, when inserted at line n1, prints 10 20 15 30?

• A. Stream.of(list1, list2)
  .flatMap(list -> list.intStream())
  .forEach(s -> System.out.print(s + " "));
• B. Stream.of(list1, list2)
  .flatMapToInt(list -> list.stream())
  .forEach(s -> System.out.print(s + " "));
• C. Stream.of(list1, list2)
  .flatMap(list -> list.stream())
  .forEach(s -> System.out.print(s + " "));
• D. list1.stream()
  .flatMap(list2.stream().flatMap(e1 -> e1.stream()) .forEach(s -> System.out.println(s + " "));

Answer: C

NEW QUESTION # 77
Which two reasons should you use interfaces instead of abstract classes? (Choose two.)

• A. You want to declare non-static on non-final fields.
• B. You want to share code among several closely related classes.
• C. You want to take advantage of multiple inheritance of type.
• D. You expect that classes that implement your interfaces have many common methods or fields, or require access modifiers other than public.
• E. You expect that unrelated classes would implement your interfaces.

Answer: C,E

Explanation:
References:

NEW QUESTION # 78
Given:
interface Doable {
public void doSomething (String s);
}
Which two class definitions compile? (Choose two.)

• A. public class Do implements Doable {
  public void doSomething(Integer i) { }
  public void doSomething(String s) { }
  public void doThat (String s) { }
  }
• B. public abstract class Task implements Doable {
  public void doSomethingElse(String s) { }
  }
• C. public class Job implements Doable {
  public void doSomething(Integer i) { }
  }
• D. public class Action implements Doable {
  public void doSomething(Integer i) { }
  public String doThis(Integer j) { }
  }
• E. public abstract class Work implements Doable {
  public abstract void doSomething(String s) { }
  public void doYourThing(Boolean b) { }
  }

Answer: A,B

NEW QUESTION # 79
Given:
public class Foo<K, V> {
private K key;
private V value;
public Foo (K key, V value) (this.key = key; this value = value;)
public static <T> Foo<T, T> twice (T value) (return new Foo<T, T> (value, value); ) public K getKey () (return key;) public V getValue () (return value;)
}
Which option fails?

• A. Foo<String, Integer> mark = new Foo<String, Integer> ("Steve", 100);
• B. Foo<String, String> grade = new Foo <> ("John", "A");
• C. Foo<?, ?> percentage = new Foo <> (97, 32);
• D. Foo<String, String> pair = Foo.<String>twice ("Hello World!");

Answer: C

NEW QUESTION # 80
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?

• A. Stream<String> lines = Files.lines (Paths.get ("customers.txt"));
  lines.forEach( c) -> System.out.println(c));
• B. Stream<Path> stream = Files.find (Paths.get ("customers.txt"));
  stream.forEach( c) -> System.out.println(c));
• C. Stream<String> stream = Files.find (Paths.get ("customers.txt"));
  stream.forEach((String c) -> System.out.println(c));
• D. Stream<Path> stream = Files.list (Paths.get ("customers.txt"));
  stream.forEach( c) -> System.out.println(c));

Answer: C

NEW QUESTION # 81
Assume customers.txt is accessible and contains multiple lines.
Which code fragment prints the contents of the customers.txt file?

• A. Stream<Path> stream = Files.list (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));
• B. Stream<String> lines = Files.lines (Paths.get ("customers.txt")); lines.forEach( c) -> System.out.println(c));
• C. Stream<String> stream = Files.find (Paths.get ("customers.txt")); stream.forEach((String c) -> System.out.println(c));
• D. Stream<Path> stream = Files.find (Paths.get ("customers.txt")); stream.forEach( c) -> System.out.println(c));

Answer: C

NEW QUESTION # 82
Given:
class Student {
String course, name, city;
public Student (String name, String course, String city) {
this.course = course; this.name = name; this.city = city;
}
public String toString() {
return course + ":" + name + ":" + city;
}
and the code fragment:
List<Student> stds = Arrays.asList(
new Student ("Jessy", "Java ME", "Chicago"),
new Student ("Helen", "Java EE", "Houston"),
new Student ("Mark", "Java ME", "Chicago"));
stds.stream()
. collect(Collectors.groupingBy(Student::getCourse))
. forEach(src, res) -> System.out.println(scr));
What is the result?

• A. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
  [Java EE: Helen:Houston]
• B. [Java EE: Helen:Houston]
  [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
• C. A compilation error occurs.
• D. Java EE
  Java ME

Answer: A

NEW QUESTION # 83
Given the code fragment:

Which statement can be inserted into line n1 to print 1,2; 1,10; 2,20;?

• A. BiConsumer<Integer, Integer, Integer> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ");};
• B. BiConsumer<Integer, Integer, String> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};
• C. BiFunction<Integer, Integer, String> c = (i, j) ?gt; {System.out.print (i + "," + j+ "; ")};
• D. BiConsumer<Integer,Integer> c = (i, j) ->
  {System.out.print (i + "," + j+
  "; ");};

Answer: D

NEW QUESTION # 84
Given:

• A. Compilation fails
• B. A ClassCastException is thrown at runtime
• C. Ym
  Xm1
• D. Ym
  Xm2

Answer: D

NEW QUESTION # 85
Given the code fragment:

What is the result?

• A. Can't logout
• B. Logged out at: 2015-01-12T21:58:19.880Z
• C. Logged out at: 2015-01-12T21:58:00Z
• D. A compilation error occurs at line n1.

Answer: C

NEW QUESTION # 86
Given:

And given the commands:

What is the result?

• A. true true
• B. true false
• C. TRUE null
• D. A ClassCastException is thrown at runtime.
• E. false false

Answer: B

NEW QUESTION # 87
Which statement is true about java.time.Duration?

• A. It preserves daylight saving time.
• B. It defines date-based values.
• C. It defines time-based values.
• D. It tracks time zones.

Answer: C

Explanation:
http://tutorials.jenkov.com/java-date-time/duration.html#accessing-the-time-of-a-duration

NEW QUESTION # 88
Given:

and the code fragment:

What is the result?

• A. The program compiles successfully.
• B. A compilation error occurs because the try block doesn't have a catch or finally block.
• C. A compilation error occurs at line n2.
• D. A compilation error occurs at line n1.

Answer: A

NEW QUESTION # 89
Given the content:

and the code fragment:

What is the result?

• A. username = Enter User Name
  password = Enter Password
• B. The program prints nothing.
• C. username = Entrez le nom d'utilisateur
  password = Entrez le mot de passe
• D. A compilation error occurs.

Answer: C

NEW QUESTION # 90
Given the definition of the Employee class:

and this code fragment:

What is the result?

• A. [Ada:sales, Bob:sales, Bob:hr, Eva:hr]
• B. [sales:Ada, hr:Bob, sales:Bob, hr:Eva]
• C. [hr:Eva, hr:Bob, sales:Bob, sales:Ada]
• D. [hr:Bob, hr:Eva, sales:Ada, sales:Bob]

Answer: B

NEW QUESTION # 91
Given the content of /resourses/Message.properties:
welcome1="Good day!"
and given the code fragment:
Properties prop = new Properties ();
FileInputStream fis = new FileInputStream
("/resources/Message.properties");
prop.load(fis);
System.out.println(prop.getProperty("welcome1"));
System.out.println(prop.getProperty("welcome2", "Test"));//line n1
System.out.println(prop.getProperty("welcome3"));
What is the result?

• A. Good day!
  Test
  followed by an Exception stack trace
• B. Good day!
  followed by an Exception stack trace
• C. Good day!
  Test
  null
• D. A compilation error occurs at line n1.

Answer: C

NEW QUESTION # 92
Given:
public class ScopeTest {
int j, int k;
public static void main(String[] args) {
ew ScopeTest().doStuff(); }
void doStuff() {
nt x = 5;
oStuff2();
System.out.println("x");
}
void doStuff2() {
nt y = 7;
ystem.out.println("y");
or (int z = 0; z < 5; z++) {
ystem.out.println("z");
ystem.out.println("y");
}
Which two items are fields?

• A. z
• B. k
• C. x
• D. y
• E. j

Answer: B,E

NEW QUESTION # 93
Given the structure of the Student table:
Student (id INTEGER, name VARCHAR)
Given the records from the STUDENTtable:

Given the code fragment:

Assume that:
The required database driver is configured in the classpath.

The appropriate database is accessible with the dbURL, userName, and passWord exists.

What is the result?

• A. The program prints Status: falsebut the records from the Studenttable are not deleted.
• B. A SQLExceptionis thrown at runtime.
• C. The program prints Status: falseand two records are deleted from the Student table.
• D. The program prints Status: trueand two records are deleted from the Student table.

Answer: C

Explanation:
Explanation/Reference:

NEW QUESTION # 94
......

In addition to the exam, Oracle offers various resources to help candidates prepare for the test, including training courses, practice exams, and study guides. By passing the Oracle 1z1-809 exam, Java developers can demonstrate their advanced programming skills and increase their career opportunities in the field.

 

1z1-809 Exam Questions – Valid 1z1-809 Dumps Pdf: https://testking.braindumpsit.com/1z1-809-latest-dumps.html