Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 181:

  Given: A. X XX

  

  B. X Y X

  C. Y Y X

  D. Y YY

  Correct Answer: D

• Question 182:

  Which of the following can fill in the blank in this code to make it compile?

  

  A. abstract

  B. final

  C. private

  D. default

  E. int

  Correct Answer: C

  From Java SE 8, we can use static and/or default methods in interfaces, but they should be non abstract methods. SO in this case using default in blank is completely legal. Hence option C is correct. Option A is incorrect as given method is not abstract, so can't use abstract there. Options B and E are incorrect as we can't have non abstract method interface if they are not default or static. httpsy/docs.oracle.com/javase/tutorial/iava/landl/defaultmethods.html

• Question 183:

  Given the code fragment:

  

  What is the result?

  A. 100

  B. 101

  C. 102

  D. 103

  E. Compilation fails

  Correct Answer: A

• Question 184:

  Given:

  package p1;

  public interface DoInterface {

  void method1(int n1); // line n1

  }

  package p3;

  import p1.DoInterface;

  public class DoClass implements DoInterface {

  public DoClass(int p1) { }

  public void method1(int p1) { } // line n2

  private void method2(int p1) { } // line n3

  }

  public class Test {

  public static void main(String[] args) {

  DoInterface doi= new DoClass(100); // line n4

  doi.method1(100);

  doi.method2(100);

  }

  }

  Which change will enable the code to compile?

  A. Adding the public modifier to the declaration of method1 at line n1

  B. Removing the public modifier from the definition of method1 at line n2

  C. Changing the private modifier on the declaration of method 2 public at line n3

  D. Changing the line n4 DoClass doi = new DoClass ( );

  Correct Answer: C

  Explanation: Private members (both fields and methods) are only accessible inside the class they are declared or inside inner classes. private keyword is one of four access modifier provided by Java and its a most restrictive among all four e.g. public, default(package), protected and private.

  Read more: http://javarevisited.blogspot.com/2012/03/private-in-java-why-should-youalways.html#ixzz3Sh3mOc4D

• Question 185:

  Given:

  

  A. a, e i, i

  B. a, e o, o

  C. e, e i, i

  D. a, a o, o

  Correct Answer: A

• Question 186:

  Which code fragment cause a compilation error?

  A. flat flt = 100F;

  B. float flt = (float) 1_11.00;

  C. float flt = 100;

  D. double y1 = 203.22; floatflt = y1

  E. int y2 = 100; floatflt = (float) y2;

  Correct Answer: B

• Question 187:

  Given:

  class MarksOutOfBoundsException extends IndexOutOfBoundsException { }

  public class GradingProcess {

  void verify(int marks) throws IndexOutOfBoundsException {

  if (marks > 100) {

  throw new MarksOutOfBoundsException();

  }

  if (marks > 50) {

  System.out.print("Pass");

  } else {

  System.out.print("Fail");

  }

  }

  public static void main(String[] args) {

  int marks = Integer.parseInt(args[2]);

  try {

  new GradingProcess().verify(marks));

  } catch(Exception e) {

  System.out.print(e.getClass());

  }

  }

  }

  And the command line invocation:

  Java grading process 89 50 104

  What is the result?

  A. Pass

  B. Fail

  C. Class MarketOutOfBoundsException

  D. Class IndexOutOfBoundsException

  E. Class Exception

  Correct Answer: C

  Explanation: The value 104 will cause a MarketOutOfBoundsException

• Question 188:

  Given: What is the result?

  

  A. 3 4 5 6

  B. 3 4 3 6

  C. 5 4 5 6

  D. 3 6 4 6

  Correct Answer: C

• Question 189:

  Given:

  

  What is the result?

  A. 11, 21, 31, 11, 21, 31

  B. 11, 21, 31, 12, 22, 32

  C. 12, 22, 32, 12, 22, 32

  D. 10, 20, 30, 10, 20, 30

  Correct Answer: D

• Question 190:

  What is the name of the Java concept that uses access modifiers to protect variables and hide them within a class?

  A. Encapsulation

  B. Inheritance

  C. Abstraction

  D. Instantiation

  E. Polymorphism

  Correct Answer: A