Oracle 1Z0-809 Exam Questions and Answers 2021

NEW QUESTION 1
Given the content:

and given the code fragment:

Which two code fragments, when inserted at line 1 independently, enable the code to print “Wie geht’s?”

• A. currentLocale = new Locale (“de”, “DE”);
• B. currentLocale = new Locale.Builder ().setLanguage (“de”).setRegion (“DE”).build ();
• C. currentLocale = Locale.GERMAN;
• D. currentlocale = new Locale(); currentLocale.setLanguage (“de”); currentLocale.setRegion (“DE”);
• E. currentLocale = Locale.getInstance(Locale.GERMAN,Locale.GERMANY);

Answer: B

NEW QUESTION 2
Given the structure of the STUDENT table: Student (id INTEGER, name VARCHAR) Given:
public class Test {
static Connection newConnection =null;
public static Connection get DBConnection () throws SQLException { try (Connection con = DriveManager.getConnection(URL, username, password)) {
newConnection = con;
}
return newConnection;
}
public static void main (String [] args) throws SQLException { get DBConnection ();
Statement st = newConnection.createStatement(); st.executeUpdate(“INSERT INTO student VALUES (102, ‘Kelvin’)”);
}
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database is accessible with the URL, userName, and passWord exists. The SQL query is valid.
What is the result?

• A. The program executes successfully and the STUDENT table is updated with one record.
• B. The program executes successfully and the STUDENT table is NOT updated with any record.
• C. A SQLException is thrown as runtime.
• D. A NullPointerException is thrown as runtime.

Answer: C

NEW QUESTION 3
Given the code fragment:

What is the result?

• A. Java EEJava EESE
• B. Java EESE
• C. The program prints either:Java EEJava SE orJava SEJava EE
• D. Java EEJava SE

Answer: D

NEW QUESTION 4
Given the records from the Employee table:

and given the code fragment: try {
Connection conn = DriverManager.getConnection (URL, userName, passWord); Statement st = conn.createStatement(ResultSet.TYPE_SCROLL_INSENSITIVE, ResultSet.CONCUR_UPDATABLE);
st.execute(“SELECT*FROM Employee”); ResultSet rs = st.getResultSet();
while (rs.next()) {
if (rs.getInt(1) ==112) { rs.updateString(2, “Jack”);
}
}
rs.absolute(2);
System.out.println(rs.getInt(1) + “ “ + rs.getString(2));
} catch (SQLException ex) { System.out.println(“Exception is raised”);
}
Assume that:
The required database driver is configured in the classpath.
The appropriate database accessible with the URL, userName, and passWord exists. What is the result?

• A. The Employee table is updated with the row: 112 Jackand the program prints: 112 Jerry
• B. The Employee table is updated with the row: 112 Jackand the program prints: 112 Jack
• C. The Employee table is not updated and the program prints: 112 Jerry
• D. The program prints Exception is raised.

Answer: A

NEW QUESTION 5
Given:
class Bird {
public void fly () { System.out.print(“Can fly”); }
}
class Penguin extends Bird {
public void fly () { System.out.print(“Cannot fly”); }
}
and the code fragment: class Birdie {
public static void main (String [ ] args) { fly( ( ) -> new Bird ( ));
fly (Penguin : : new);
}
/* line n1 */
}
Which code fragment, when inserted at line n1, enables the Birdie class to compile?

• A. static void fly (Consumer<Bird> bird) { bird :: fly ();}
• B. static void fly (Consumer<? extends Bird> bird) {bird.accept( ) fly ();}
• C. static void fly (Supplier<Bird> bird) { bird.get( ) fly ();}
• D. static void fly (Supplier<? extends Bird> bird) { LOST

Answer: C

NEW QUESTION 6
Given the code fragment:

Which code fragment, when inserted at line n1, enables the code to print /First.txt?

• A. Path iP = new Paths (“/First.txt”);
• B. Path iP = Paths.toPath (“/First.txt”);
• C. Path iP = new Path (“/First.txt”);
• D. Path iP = Paths.get (“/”, “First.txt”);

Answer: D

NEW QUESTION 7
Given the code fragment:
Path source = Paths.get (“/data/december/log.txt”); Path destination = Paths.get(“/data”);
Files.copy (source, destination);
and assuming that the file /data/december/log.txt is accessible and contains: 10-Dec-2014 – Executed successfully
What is the result?

• A. A file with the name log.txt is created in the /data directory and the content of the /data/december/ log.txt file is copied to it.
• B. The program executes successfully and does NOT change the file system.
• C. A FileNotFoundException is thrown at run time.
• D. A FileAlreadyExistsException is thrown at run time.

Answer: D

NEW QUESTION 8
Given the code fragment:

Which two code fragments, when inserted at line n1 independently, result in the output PEEK: Unix?

• A. .anyMatch ();
• B. .allMatch ();
• C. .findAny ();
• D. .noneMatch ();
• E. .findFirst ();

Answer: E

NEW QUESTION 9
Given:
class ImageScanner implements AutoCloseable { public void close () throws Exception { System.out.print (“Scanner closed.”);
}
public void scanImage () throws Exception { System.out.print (“Scan.”);
throw new Exception(“Unable to scan.”);
}
}
class ImagePrinter implements AutoCloseable { public void close () throws Exception { System.out.print (“Printer closed.”);
}
public void printImage () {System.out.print(“Print.”); }
}
and this code fragment:
try (ImageScanner ir = new ImageScanner(); ImagePrinter iw = new ImagePrinter()) { ir.scanImage();
iw.printImage();
} catch (Exception e) { System.out.print(e.getMessage());
}
What is the result?

• A. Scan.Printer close
• B. Scanner close
• C. Unable to scan.
• D. Scan.Scanner close
• E. Unable to scan.
• F. Sca
• G. Unable to scan.
• H. Sca
• I. Unable to sca
• J. Printer closed.

Answer: A

NEW QUESTION 10
Given:
class RateOfInterest {
public static void main (String[] args) { int rateOfInterest = 0;
String accountType = “LOAN”; switch (accountType) {
case “RD”; rateOfInterest = 5; break;
case “FD”; rateOfInterest = 10; break;
default:
assert false: “No interest for this account”; //line n1
}
System.out.println (“Rate of interest:” + rateOfInterest);
}
}
and the command:
java –ea RateOfInterest What is the result?

• A. Rate of interest: 0
• B. An AssertionError is thrown.
• C. No interest for this account
• D. A compilation error occurs at line n1.

Answer: B

NEW QUESTION 11
Given the structure of the Student table: Student (id INTEGER, name VARCHAR) Given the records from the STUDENT table:

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: true and two records are deleted from the Student table.
• B. The program prints Status: false and two records are deleted from the Student table.
• C. A SQLException is thrown at runtime.
• D. The program prints Status: false but the records from the Student table are not deleted.

Answer: B

NEW QUESTION 12
Given the code fragment:

What is the result?

• A. A compilation error occurs at line n1.
• B. Checking…
• C. Checking… Checking…
• D. A compilation error occurs at line n2.

Answer: A

NEW QUESTION 13
Assume customers.txt is accessible and contains multiple lines. Which code fragment prints the contents of the customers.txt file?

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

Answer: A

NEW QUESTION 14
What is true about the java.sql.Statement interface?

• A. It provides a session with the database.
• B. It is used to get an instance of a Connection object by using JDBC drivers.
• C. It provides a cursor to fetch the resulting data.
• D. It provides a class for executing SQL statements and returning the results.

Answer: D

NEW QUESTION 15
Given:
class Worker extends Thread { CyclicBarrier cb;
public Worker(CyclicBarrier cb) { this.cb = cb; } public void run () {
try { cb.await();
System.out.println(“Worker…”);
} catch (Exception ex) { }
}
}
class Master implements Runnable { //line n1 public void run () { System.out.println(“Master…”);
}
}
and the code fragment:
Master master = new Master();
//line n2
Worker worker = new Worker(cb); worker.start();
You have been asked to ensure that the run methods of both the Worker and Master classes are executed. Which modification meets the requirement?

• A. At line n2, insert CyclicBarrier cb = new CyclicBarrier(2, master);
• B. Replace line n1 with class Master extends Thread {
• C. At line n2, insert CyclicBarrier cb = new CyclicBarrier(1, master);
• D. At line n2, insert CyclicBarrier cb = new CyclicBarrier(master);

Answer: C

NEW QUESTION 16
Given:

Which two interfaces can you use to create lambda expressions? (Choose two.)

• A. T
• B. R
• C. P
• D. S
• E. Q
• F. U

Answer: AF