Oracle Oracle Database 1Z0-809 Questions & Answers

• Question 1:

  Given:

  

  Which code fragment can be inserted to print: Peacock is eating?

  A. BirdInt b = new::Bird("Peacock");

  B. BirdInt b1 = Bird::new; Bird b = b1.getBird("Peacock");

  C. BirdInt b = new Bird ("Peacock");

  D. Bird b = Bird::new("Peacock");

  Correct Answer: B

• Question 2:

  Given:

  

  and the code fragment:

  

  Which code fragment can be inserted to print 13?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: B

• Question 3:

  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. The Employee

  and Customer tables are available and each table has id column with a few records and the SQL queries

  are valid.

  What is the result of compiling and executing this code fragment?

  A. The program prints employee IDs.

  B. The program prints customer IDs.

  C. The program prints Exception.

  D. compilation fails on line 13.

  Correct Answer: C

• Question 4:

  Given the code fragment:

  

  What is the result?

  A. 0 : 0 : pen

  B. 0 : 1 : pen

  C. 0 : pen

  D. 0 : 1 : 2 : 3 : 4 :

  E. A compilation error occurs.

  Correct Answer: E

• Question 5:

  Given:

  

  and the code fragment:

  

  What is the result?

  A. User is registered.

  B. An AgeOutOfLimitException is thrown.

  C. A UserException is thrown.

  D. A compilation error occurs in the doRegister method.

  Correct Answer: B

• Question 6:

  Given the definition of the Vehicle class:

  

  Which action encapsulates the Vehicle class?

  A. Make the Vehicle class private.

  B. Make the name variable public.

  C. Make the getName() and setName() method public.

  D. Make the name variable private.

  E. Make the getName() and setName() method private.

  Correct Answer: B

• Question 7:

  Given the code fragment:

  Path path1 = Paths.get("/app/./sys/");

  Path res1 = path1.resolve("log");

  Path path2 = Paths.get("/server/exe/");

  Path res2 = path2.resolve("/readme/");

  System.out.println(res1);

  System.out.println(res2);

  What is the result?

  A. /app/sys/log /readme/server/exe

  B. /app/log/sys /server/exe/readme

  C. /app/./sys/log /readme

  D. /app/./sys/log /server/exe/readme

  Correct Answer: B

• Question 8:

  Given the code fragment:

  public class Foo {

  public static void main (String [ ] args) {

  Map unsortMap = new HashMap< > ( );

  unsortMap.put (10, "z");

  unsortMap.put (5, "b");

  unsortMap.put (1, "d");

  unsortMap.put (7, "e");

  unsortMap.put (50, "j");

  Map treeMap = new TreeMap (new Comparator ( ) {

  @Override public int compare (Integer o1, Integer o2) {return o1.compareTo (o2); } } );

  treeMap.putAll (unsortMap);

  for (Map.Entry entry : treeMap.entrySet () ) { System.out.print (entry.getValue () + " ");

  }

  }

  }

  What is the result?

  A. A compilation error occurs.

  B. d b e z j

  C. j z e b d

  D. z b d e j

  Correct Answer: B

• Question 9:

  Given the code fragments:

  class Employee {

  Optional

  address;

  Employee (Optional

  address) {

  this.address = address;

  }

  public Optional

  getAddress() { return address; }

  }

  class Address {

  String city = "New York";

  public String getCity { return city: }

  public String toString() {

  return city;

  }

  }

  and

  Address address = new Address;

  Optional

  addrs1 = Optional.ofNullable (address);

  Employee e1 = new Employee (addrs1);

  String eAddress = (addrs1.isPresent()) ? addrs1.get().getCity() : "City Not available";

  System.out.println(eAddress);

  What is the result?

  A. New York

  B. City Not available

  C. null

  D. A NoSuchElementException is thrown at run time.

  Correct Answer: C

• Question 10:

  Given the code fragment:

  public void recDelete (String dirName) throws IOException {

  File [ ] listOfFiles = new File (dirName) .listFiles();

  if (listOfFiles ! = null andand listOfFiles.length >0) {

  for (File aFile : listOfFiles) {

  if (!aFile.isDirectory ()) {

  if (aFile.getName ().endsWith (".class"))

  aFile.delete ();

  }

  }

  }

  }

  Assume that Projects contains subdirectories that contain .class files and is passed as an argument to the

  recDelete () method when it is invoked.

  What is the result?

  A. The method deletes all the .class files in the Projects directory and its subdirectories.

  B. The method deletes the .class files of the Projects directory only.

  C. The method executes and does not make any changes to the Projects directory.

  D. The method throws an IOException.

  Correct Answer: B