Oracle Oracle Certifications 1Z0-809 Questions & Answers

• Question 131:

  Given: and the code fragment:

  

  

  Which modification enables the code fragment to print Speaker?

  A. Implement Predicate in the Product.ProductFilter class and replace line n2 with .filter (p -> p.ProductFilter.test (p))

  B. Replace line n1 with: public static boolean isAvailable (Product p) {

  C. Replace line n2 with: .filter (p -> p.ProductFilter: :isAvailable (p))

  D. Replace line n2 with: .filter (p -> Product: :ProductFilter: :isAvailable ())

  Correct Answer: B

• Question 132:

  Given the code fragments:

  class TechName {

  String techName;

  TechName (String techName) {

  this.techName=techName;

  }

  }

  and

  List tech = Arrays.asList (

  new TechName("Java-"),

  new TechName("Oracle DB-"),

  new TechName("J2EE-")

  );

  Stream stre = tech.stream();

  //line n1

  Which should be inserted at line n1 to print Java-Oracle DB-J2EE-?

  A. stre.forEach(System.out::print);

  B. stre.map(a-> a.techName).forEach(System.out::print);

  C. stre.map(a-> a).forEachOrdered(System.out::print);

  D. stre.forEachOrdered(System.out::print);

  Correct Answer: B

• Question 133:

  Given the code fragment:

  public class FileThread implements Runnable { String fName;

  public FileThread(String fName) { this.fName = fName; }

  public void run () System.out.println(fName);}

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

  ExecutorService executor = Executors.newCachedThreadPool();

  Stream listOfFiles = Files.walk(Paths.get("Java Projects"));

  listOfFiles.forEach(line -> {

  executor.execute(new FileThread(line.getFileName().toString())); //

  line n1

  });

  executor.shutdown();

  executor.awaitTermination(5, TimeUnit.DAYS); //

  line n2

  }

  }

  The Java Projects directory exists and contains a list of files.

  What is the result?

  A. The program throws a runtime exception at line n2.

  B. The program prints files names concurrently.

  C. The program prints files names sequentially.

  D. A compilation error occurs at line n1.

  Correct Answer: B

• Question 134:

  Given:

  class CheckClass {

  public static int checkValue (String s1, String s2) {

  return s1 length() ?s2.length();

  }

  }

  and the code fragment:

  String[] strArray = new String [] {"Tiger", "Rat", "Cat", "Lion"}

  //line n1

  for (String s : strArray) {

  System.out.print (s + " ");

  }

  Which code fragment should be inserted at line n1 to enable the code to print Rat Cat Lion Tiger?

  A. Arrays.sort(strArray, CheckClass : : checkValue);

  B. Arrays.sort(strArray, (CheckClass : : new) : : checkValue);

  C. Arrays.sort(strArray, (CheckClass : : new).checkValue);

  D. Arrays.sort(strArray, CheckClass : : new : : checkValue);

  Correct Answer: A

• Question 135:

  Given the code fragment:

  String str = "Java is a programming language"; ToIntFunction indexVal = str: : indexOf; //line n1 int x = indexVal.applyAsInt("Java"); //line n2 System.out.println(x);

  What is the result?

  A. 0

  B. 1

  C. A compilation error occurs at line n1.

  D. A compilation error occurs at line n2.

  Correct Answer: A

• Question 136:

  Given the code fragment:

  List codes = Arrays.asList ("DOC", "MPEG", "JPEG");

  codes.forEach (c -> System.out.print(c + " "));

  String fmt = codes.stream()

  .filter (s-> s.contains ("PEG"))

  .reduce((s, t) -> s + t).get();

  System.out.println("\n" + fmt);

  What is the result?

  A. DOC MPEG JPEG MPEGJPEG

  B. DOC MPEG MPEGJPEG MPEGMPEGJPEG

  C. MPEGJPEG MPEGJPEG

  D. The order of the output is unpredictable.

  Correct Answer: A

• Question 137:

  Given the code fragment:

  List nL = Arrays.asList("Jim", "John", "Jeff");

  Function funVal = s -> "Hello : ".contact(s);

  nL.Stream()

  .map(funVal)

  .peek(System.out::print);

  What is the result?

  A. Hello : Jim Hello : John Hello : Jeff

  B. Jim John Jeff

  C. The program prints nothing.

  D. A compilation error occurs.

  Correct Answer: C

• Question 138:

  Given:

  public interface Moveable {

  public default void walk (Integer distance) {System.out.println("Walking");)

  public void run(Integer distance);

  }

  Which statement is true?

  A. Moveable can be used as below: Moveable animal = n - > System.out.println("Running" + n); animal.run(100); animal.walk(20);

  B. Moveable can be used as below: Moveable animal = n - > n + 10; 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. Movable cannot be used in a lambda expression.

  Correct Answer: A

• Question 139:

  Which two code blocks correctly initialize a Locale variable? (Choose two.)

  A. Locale loc1 = "UK";

  B. Locale loc2 = Locale.getInstance("ru");

  C. Locale loc3 = Locale.getLocaleFactory("RU");

  D. Locale loc4 = Locale.UK;

  E. Locale loc5 = new Locale ("ru", "RU");

  Correct Answer: DE

• Question 140:

  Given:

  class FuelNotAvailException extends Exception { } class Vehicle { void ride() throws FuelNotAvailException { //line n1 System.out.println(“Happy Journey!”);

  } } class SolarVehicle extends Vehicle {

  public void ride () throws Exception { //line n2 super ride (); } }

  and the code fragment:

  public static void main (String[] args) throws FuelNotAvailException, Exception { Vehicle v = new SolarVehicle (); v.ride();

  }

  Which modification enables the code fragment to print Happy Journey!?

  A. Replace line n1 with public void ride() throws FuelNotAvailException {

  B. Replace line n1 with protected void ride() throws Exception {

  C. Replace line n2 with void ride() throws Exception {

  D. Replace line n2 with private void ride() throws FuelNotAvailException {

  Correct Answer: B