Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 241:

  Which two are benefits of polymorphism?

  A. Faster code at runtime

  B. More efficient code at runtime

  C. More dynamic code at runtime

  D. More flexible and reusable code

  E. Code that is protected from extension by other classes

  Correct Answer: BD

• Question 242:

  Given: What is the result?

  

  A. 200.0 : 100.0

  B. 400.0 : 200.0

  C. 400.0 : 100.0

  D. Compilation fails.

  Correct Answer: C

• Question 243:

  Given:

  class Base {

  // insert code here

  }

  public class Derived extends Base{

  public static void main(String[] args) {

  Derived obj = new Derived();

  obj.setNum(3);

  System.out.println("Square = " + obj.getNum() * obj.getNum());

  }

  }

  Which two options, when inserted independently inside class Base, ensure that the class is being properly

  encapsulated and allow the program to execute and print the square of the number?

  A. private int num; public int getNum() { return num; }public void setNum(int num) { this.num = num;}

  B. public int num; protected public int getNum() { return num; }protected public void setNum(int num) { this.num = num;}

  C. private int num;public int getNum() {return num;} private void setNum(int num) { this.num = num;}

  D. protected int num; public int getNum() { return num; } public void setNum(int num) { this.num = num;}

  E. protected int num; private int getNum() { return num; } public void setNum(int num) { this.num = num;}

  Correct Answer: AD

  Incorrect:

  Not B: illegal combination of modifiers: protected and public not C: setNum method cannot be private.

  not E: getNum method cannot be private.

• Question 244:

  Which statement will empty the contents of a StringBuilder variable named sb?

  A. sb.deleteAll();

  B. sb.delete(0, sb.size());

  C. sb.delete(0, sb.length());

  D. sb.removeAll();

  Correct Answer: C

• Question 245:

  Given the code fragment:

  

  What is the result?

  A. [Robb, Rick, Bran]

  B. [Robb, Rick]

  C. [Robb, Bran, Rick, Bran]

  D. An exception is thrown at runtime.

  Correct Answer: A

• Question 246:

  Given the code fragment:

  for (int ii = 0; ii < 3;ii++) {

  int count = 0;

  for (int jj = 3; jj > 0; jj--) {

  if (ii == jj) {

  ++count;

  break;

  }

  }

  System.out.print(count);

  continue;

  }

  What is the result?

  A. 011

  B. 012

  C. 123

  D. 000

  Correct Answer: A

• Question 247:

  You are asked to develop a program for a shopping application, and you are given the following information:

  The application must contain the classes Toy, EduToy, and consToy. The Toy class is the superclass of the other two classes. The int caicuiatePrice (Toy t) method calculates the price of a toy. The void printToy (Toy t) method prints the details of a toy.

  Which definition of the Toy class adds a valid layer of abstraction to the class hierarchy?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: A

• Question 248:

  Given:

  

  What will be the output?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: D

• Question 249:

  Given the code fragment: Which two modifications, made independently, enable the code to compile?

  

  A. Make the method at line n1 public.

  B. Make the method at line n2 public.

  C. Make the method at line n3 public.

  D. Make the method at line n3 protected.

  E. Make the method at line n4 public.

  Correct Answer: CD

• Question 250:

  Class StaticField {

  static int i = 7;

  public static void main(String[] args) {

  StaticFied obj = new StaticField();

  obj.i++;

  StaticField.i++;

  obj.i++;

  System.out.println(StaticField.i + " "+ obj.i);

  }

  }

  What is the result?

  A. 10 10

  B. 8 9

  C. 9 8

  D. 7 10

  Correct Answer: A