Oracle Oracle Certifications 1Z0-809 Questions & Answers

• Question 121:

  Given that /green.txt and /colors/yellow.txt are accessible, and the code fragment:

  Path source = Paths.get("/green.txt);

  Path target = Paths.get("/colors/yellow.txt);

  Files.move(source, target, StandardCopyOption.ATOMIC_MOVE);

  Files.delete(source);

  Which statement is true?

  A. The green.txt file content is replaced by the yellow.txt file content and the yellow.txt file is deleted.

  B. The yellow.txt file content is replaced by the green.txt file content and an exception is thrown.

  C. The file green.txt is moved to the /colors directory.

  D. A FileAlreadyExistsException is thrown at runtime.

  Correct Answer: D

• Question 122:

  Given:

  interface Doable {

  public void doSomething (String s);

  }

  Which two class definitions compile? (Choose two.)

  A. public abstract class Task implements Doable { public void doSomethingElse(String s) { } }

  B. public abstract class Work implements Doable { public abstract void doSomething(String s) { } public void doYourThing(Boolean b) { } }

  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 class Do implements Doable { public void doSomething(Integer i) { } public void doSomething(String s) { } public void doThat (String s) { } }

  Correct Answer: AE

• Question 123:

  Given the code fragment:

  List list1 = Arrays.asList(10, 20); List 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.stream()) .forEach(s -> System.out.print(s + " "));

  B. Stream.of(list1, list2) .flatMap(list -> list.intStream()) .forEach(s -> System.out.print(s + " "));

  C. list1.stream() .flatMap(list2.stream().flatMap(e1 -> e1.stream()) .forEach(s -> System.out.println(s + " "));

  D. Stream.of(list1, list2) .flatMapToInt(list -> list.stream()) .forEach(s -> System.out.print(s + " "));

  Correct Answer: A

• Question 124:

  Given the code fragment:

  public static void main (String[] args) throws IOException {

  BufferedReader brCopy = null;

  try (BufferedReader br = new BufferedReader (new FileReader("employee.txt"))) { //

  line n1

  br.lines().forEach(c -> System.out.println(c));

  brCopy = br; //line n2

  }

  brCopy.ready(); //line n3;

  }

  Assume that the ready method of the BufferedReader, when called on a closed BufferedReader, throws an

  exception, and employee.txt is accessible and contains valid text.

  What is the result?

  A. A compilation error occurs at line n3.

  B. A compilation error occurs at line n1.

  C. A compilation error occurs at line n2.

  D. The code prints the content of the employee.txt file and throws an exception at line n3.

  Correct Answer: D

• Question 125:

  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 Programming View http:/ ebook.com/ebook

  B. Read Java Programming Read http:/ ebook.com/ebook

  C. The EBook.java file fails to compile.

  D. The Test.java file fails to compile.

  Correct Answer: D

• Question 126:

  Given the code fragment:

  ZonedDateTime depart = ZonedDateTime.of(2015, 1, 15, 3, 0, 0, 0, ZoneID.of("UTC-7")); ZonedDateTime arrive = ZonedDateTime.of(2015, 1, 15, 9, 0, 0, 0, ZoneID.of("UTC-5")); long hrs = ChronoUnit.HOURS.between(depart, arrive); //line n1 System.out.println("Travel time is" + hrs + "hours");

  What is the result?

  A. Travel time is 4 hours

  B. Travel time is 6 hours

  C. Travel time is 8 hours

  D. An exception is thrown at line n1.

  Correct Answer: A

• Question 127:

  Given the code fragment:

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

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

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

  Path res1 = path1.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: C

• Question 128:

  Given the code fragment:

  List colors = Arrays.asList("red", "green", "yellow");

  Predicate test = n - > {

  System.out.println("Searching...");

  return n.contains("red");

  };

  colors.stream()

  .filter(c -> c.length() > 3)

  .allMatch(test);

  What is the result?

  A. Searching...

  B. Searching... Searching...

  C. Searching... Searching... Searching...

  D. A compilation error occurs.

  Correct Answer: A

• Question 129:

  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. User is registered.

  B. An AgeOutOfLimitException is thrown.

  C. A UserException is thrown.

  D. A compilation error occurs in the main method.

  Correct Answer: B

• Question 130:

  Given the code fragment:

  

  What is the result?

  A. 5 : 3 : 6

  B. 6 : 5 : 6

  C. 3 : 3 : 4

  D. 4 : 4 : 4

  Correct Answer: D