Updated Oct 02, 2025 Verified Pass 1z1-809 Exam in First Attempt Guaranteed
Free 1z1-809 Sample Questions and 100% Cover Real Exam Questions (Updated 209 Questions)
Preparation for the 1z1-809 exam typically involves studying the exam objectives, reading related textbooks, and practicing with sample questions and simulations. Oracle also offers official training courses that can help prepare candidates for the exam. These courses cover all the topics tested on the 1z1-809 exam and provide hands-on lab exercises to reinforce learning.
NEW QUESTION # 31
Which statement is true about the DriverManager class?
- A. it is written by different vendors for their specific database.
- B. It returns an instance of Connection.
- C. It only queries metadata of the database.
- D. it executes SQL statements against the database.
Answer: B
Explanation:
Explanation
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the underlying driver connection (which is often a PDO instance).
NEW QUESTION # 32
Given:
And given the commands:
What is the result?
- A. true false
- B. true true
- C. false false
- D. TRUE null
- E. A ClassCastException is thrown at runtime.
Answer: A
NEW QUESTION # 33
Given the code fragment:
List<String> empDetails = Arrays.asList("100, Robin, HR", "200, Mary, AdminServices","101, Peter, HR"); empDetails.stream()
.filter(s-> s.contains("r"))
.sorted()
.forEach(System.out::println); //line n1
What is the result?
- A. 100, Robin, HR200, Mary, AdminServices101, Peter, HR
- B. 101, Peter, HR200, Mary, AdminServices
- C. 100, Robin, HR101, Peter, HR
- D. E. A compilation error occurs at line n1.
Answer: A
NEW QUESTION # 34
Given the code fragment:
What is the result?
- A. 5 : 10
- B. Compilation fails.
- C. 10 : 10
- D. 5 : 5
Answer: C
NEW QUESTION # 35
Which statement is true about the switch statement?
- A. The break statement, at the end of each case block, is mandatory.
- B. Its case label literals can be changed at runtime.
- C. Its expression must evaluate to a single value.
- D. It must contain the default section.
Answer: C
NEW QUESTION # 36
Given the code fragment:
Map<Integer, String> books = new TreeMap<>();
books.put (1007, “A”);
books.put (1002, “C”);
books.put (1001, “B”);
books.put (1003, “B”);
System.out.println (books);
What is the result?
- A. {1002 = C, 1003 = B, 1007 = A}
- B. {1007 = A, 1001 = B, 1003 = B, 1002 = C}
- C. {1007 = A, 1002 = C, 1001 = B, 1003 = B}
- D. {1001 = B, 1002 = C, 1003 = B, 1007 = A}
Answer: D
Explanation:
Explanation/Reference:
Reference: TreeMap inherits SortedMap and automatically sorts the element's key
NEW QUESTION # 37
Which class definition compiles?
- A.
- B.
- C.
- D.
Answer: D
Explanation:
Explanation
NEW QUESTION # 38
Given the code fragments:
class TechName {
String techName;
TechName (String techName) {
this.techName=techName;
}
}
and
List<TechName> tech = Arrays.asList (
new TechName("Java-"),
new TechName("Oracle DB-"),
new TechName("J2EE-")
);
Stream<TechName> stre = tech.stream();
//line n1
Which should be inserted at line n1 to print Java-Oracle DB-J2EE-?
- A. stre.map(a-> a).forEachOrdered(System.out::print);
- B. stre.map(a-> a.techName).forEach(System.out::print);
- C. stre.forEachOrdered(System.out::print);
- D. stre.forEach(System.out::print);
Answer: B
NEW QUESTION # 39
Given:
Book.java:
public class Book {
private String read(String bname) { return "Read" + bname }
}
EBook.java:
public class EBook extends Book {
public class String read (String url) { return "View" + url }
}
Test.java:
public class Test {
public static void main (String[] args) {
Book b1 = new Book();
b1.read("Java Programing");
Book b2 = new EBook();
b2.read("http://ebook.com/ebook");
}
}
What is the result?
- A. Read Java ProgrammingView http:/ ebook.com/ebook
- B. The EBook.java file fails to compile.
- C. Read Java ProgrammingRead http:/ ebook.com/ebook
- D. The Test.java file fails to compile.
Answer: D
NEW QUESTION # 40
Given:
What is the result?
- A. 2 4 6 8
- B. 1 3 5 7
- C. 2 4 6 8 9
- D. 1 3 5 7 9
Answer: D
NEW QUESTION # 41
Given the code fragment:
UnaryOperator<Double> uo1 = s -> s*2;//line n1
List<Double> loanValues = Arrays.asList(1000.0, 2000.0);
loanValues.stream()
.filter(lv -> lv >= 1500)
.map(lv -> uo1.apply(lv))//line n2
.forEach(s -> System.out.print(s + " "));
What is the result?
- A. A compilation error occurs at line n1.
- B. A compilation error occurs at line n2.
- C. 4000.0
- D. 0
Answer: B
NEW QUESTION # 42
Given the code fragment:
What is the result?
- A. 13480.02
- B. Compilation fails.
- C. An exception is thrown at runtime.
- D. 13480.0
Answer: D
NEW QUESTION # 43
Given the code fragment:
What is the result?
- A. 0
- B. 1
- C. 2
- D. 3
Answer: A
NEW QUESTION # 44
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. Java EEJava ME
- D. A compilation error occurs.
Answer: C
NEW QUESTION # 45
For which three objects must a vendor provide implementations in its JDBC driver?
- A. Date
- B. ResultSet
- C. Time
- D. SQLException
- E. DriverManager
- F. Statement
- G. Connection
Answer: B,F,G
Explanation:
Explanation/Reference:
Explanation: Database vendors support JDBC through the JDBC driver interface or through the ODBC connection. Each driver must provide implementations of java.sql.Connection, java.sql.Statement, java.sql.PreparedStatement, java.sql.CallableStatement, and java.sql.Re sultSet. They must also implement the java.sql.Driver interface for use by the generic java.sql.DriverManager interface.
NEW QUESTION # 46
Given:
class UserException extends Exception { }
class AgeOutOfLimitException extends UserException { }
and the code fragment:
class App {
public void doRegister(String name, int age)
throws UserException, AgeOutOfLimitException {
if (name.length () < 6) {
throw new UserException ();
} else if (age >= 60) {
throw new AgeOutOfLimitException ();
} else {
System.out.println("User is registered.");
}
}
public static void main(String[ ] args) throws UserException {
App t = new App ();
t.doRegister("Mathew", 60);
}
}
What is the result?
- A. A compilation error occurs in the main method.
- B. An AgeOutOfLimitException is thrown.
- C. A UserException is thrown.
- D. User is registered.
Answer: D
NEW QUESTION # 47
Which statement is true about the DriverManager class?
- A. it is written by different vendors for their specific database.
- B. It returns an instance of Connection.
- C. It only queries metadata of the database.
- D. it executes SQL statements against the database.
Answer: B
Explanation:
Explanation
The DriverManager returns an instance of Doctrine\DBAL\Connection which is a wrapper around the
underlying driver connection (which is often a PDO instance).
References:
NEW QUESTION # 48
Given the code fragment:
What is the result?
- A. Val:20 Val:40 Val:60
- B. Val: Val: Val:
- C. Val:10 Val:20 Val:30
- D. A compilation error occurs.
Answer: C
NEW QUESTION # 49
Given:
class Vehicle {
int vno;
String name;
public Vehicle (int vno, String name) {
this.vno = vno,;
this.name = name;
}
public String toString () {
return vno + ":" + name;
}
}
and this code fragment:
Set<Vehicle> vehicles = new TreeSet <> ();
vehicles.add(new Vehicle (10123, "Ford"));
vehicles.add(new Vehicle (10124, "BMW"));
System.out.println(vehicles);
What is the result?
- A. 10123 Ford10124 BMW
- B. 10124 BMW10123 Ford
- C. A compilation error occurs.
- D. A ClassCastException is thrown at run time.
Answer: D
NEW QUESTION # 50
Given the code fragments :
and
What is the result?
- A. TV Price :110 Refrigerator Price :2100
- B. TV Price :1000 Refrigerator Price :2000
- C. The program prints nothing.
- D. A compilation error occurs.
Answer: A
NEW QUESTION # 51
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?
[Java EE: Helen:Houston]
- A. [Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
Java EE - B. [Java EE: Helen:Houston]
- C. A compilation error occurs.
- D. Java ME
[Java ME: Jessy:Chicago, Java ME: Mark:Chicago]
Answer: D
NEW QUESTION # 52
Given:
What is the result?
- A. Area is 6.0
- B. Compilation fails at line n2.
- C. Area is 3.0
- D. Compilation fails at line n1.
Answer: B
NEW QUESTION # 53
......
Download Real Oracle 1z1-809 Exam Dumps Test Engine Exam Questions: https://www.exam4labs.com/1z1-809-practice-torrent.html
Verified 1z1-809 Dumps Q&As - 1z1-809 Test Engine with Correct Answers: https://drive.google.com/open?id=11cKbGBajrx7Nl9FDdfx8lTvOppCedvn3