Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 311:

  Given the code fragment:

  

  Which three code fragments can be independently inserted at line nl to enable the code to print one?

  A. Byte x = 1;
  B. short x = 1;
  C. String x = "1";
  D. Long x = 1;
  E. Double x = 1;
  F. Integer x = new Integer ("1");
  A. Byte x = 1;
  B. short x = 1;
  F. Integer x = new Integer ("1");

• Question 312:

  Given:

  

  What is the result?

  

  A. Option A
  B. Option B
  C. Option C
  D. Option D
  A. Option A

• Question 313:

  Given the code fragment:

  class Student {

  int rollnumber;

  String name;

  List cources = new ArrayList();

  // insert code here

  public String toString() {

  return rollnumber + " : " + name + " : " + cources;

  }

  }

  And,

  public class Test {

  public static void main(String[] args) {

  List cs = newArrayList();

  cs.add("Java");

  cs.add("C");

  Student s = new Student(123,"Fred", cs);

  System.out.println(s);

  }

  }

  Which code fragment, when inserted at line // insert code here, enables class Test to print 123 : Fred : [Java, C]?

  A. private Student(int i, String name, List cs) { /* initialization code goes here */ }
  B. public void Student(int i, String name, List cs) { /* initialization code goes here */ }
  C. Student(int i, String name, List cs) { /* initialization code goes here */ }
  D. Student(int i, String name, ArrayList cs) { /* initialization code goes here */ }
  C. Student(int i, String name, List cs) { /* initialization code goes here */ }

  ---

  Explanation/Reference:

  Incorrect:

  Not A: Student has private access line: Student s = new Student(123,"Fred", cs); Not D: Cannot be applied to given types. Line: Student s = new Student(123,"Fred", cs);

• Question 314:

  Which three statements are benefits of encapsulation?

  A. Allows a class implementation to change without changing t he clients
  B. Protects confidential data from leaking out of the objects
  C. Prevents code from causing exceptions
  D. Enables the class implementation to protect its invariants
  E. Permits classes to be combined into the same package
  F. Enables multiple instances of the same class to be created safely
  A. Allows a class implementation to change without changing t he clients
  B. Protects confidential data from leaking out of the objects
  D. Enables the class implementation to protect its invariants

• Question 315:

  Given the code fragment:

  

  What is the result?

  A. omas Invalid Name null
  B. omas ter seph
  C. Invalid Name
  D. omas Invalid Name
  D. omas Invalid Name

  ---

  Explanation/Reference:

  

• Question 316:

  Given the code fragment:

  

  What is the result?

  A. 1 3 5 7 1 3
  B. 1 2 1 3
  C. 1 3 1 3 0 0
  D. 1 3 followed by an ArrayIndexOutOfBoundsException
  E. Compilation fails.
  B. 1 2 1 3

  ---

  Explanation/Reference:

  

• Question 317:

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

  ---

  Explanation/Reference:

  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-you- always.html#ixzz3Sh3mOc4D

• Question 318:

  Given: What is the result?

  

  A. Compilation fails at line n3 and line n4.
  B. Compilation fails at line n1 and line n2.
  C. Welcome Visit Count:1 Welcome Visit Count: 1
  D. Welcome Visit Count:1 Welcome Visit Count: 2
  B. Compilation fails at line n1 and line n2.

• Question 319:

  Given: What is the result?

  

  A. Marrown String out of limits JesOran
  B. Marrown String out of limits Array out of limits
  C. Marrown String out of limits
  D. Marrown NanRed JesOran
  A. Marrown String out of limits JesOran

• Question 320:

  Given: What is result?

  

  A. Successful
  B. Unsuccessful
  C. Compilation fails
  D. An exception is thrown at runtime
  C. Compilation fails