Oracle 1Z0-808 Online Practice Questions and Exam Preparation

Oracle 1Z0-808 Online Questions & Answers

• Question 301:

  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
  A. Encapsulation

• Question 302:

  Given:

  

  And given the code fragment:

  

  What is the result?

  A. 300:300 200:300
  B. 300:100 200:300
  C. 300:0 0:300
  D. 200:300 200:300
  B. 300:100 200:300

• Question 303:

  Given the code fragment:

  

  What is the result?

  A. Compilation fails.
  B. The program compiles, but it prints nothing.
  C. HiHowAreYou removed
  D. An UnsupportedOperationException is thrown at runtime.
  C. HiHowAreYou removed

  ---

  Explanation/Reference:

• Question 304:

  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
  B. More efficient code at runtime
  D. More flexible and reusable code

  ---

  Explanation/Reference:

• Question 305:

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

  ---

  Explanation/Reference:

  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 306:

  Given:

  

  What is the result?

  A. Vehicle Bus
  B. Bus Vehicle
  C. Bus
  D. The program doesn't print anything
  A. Vehicle Bus

  ---

  Explanation/Reference:

  

• Question 307:

  Given:

  

  What is the result?

  A. Compilation fails
  B. The code compiles, but does not execute.
  C. Paildrome
  D. Wow
  E. Mom
  B. The code compiles, but does not execute.

• Question 308:

  Which two initialization statements are valid? (Choose two.)

  A. Boolean available = "TRUE":
  B. String tmpAuthor = author, author ="Mc Donald";
  C. Double price = 200D;
  D. Integer pages = 20;
  C. Double price = 200D;
  D. Integer pages = 20;

  ---

  Explanation/Reference:

  Reference: http://www.functionx.com/java/Lesson06.htm

• Question 309:

  Given the code fragment:

  // insert code here

  arr[0] = new int[3];

  arr[0][0] = 1;

  arr[0][1] = 2;

  arr[0][2] = 3;

  arr[1] = new int[4];

  arr[1][0] = 10;

  arr[1][1] = 20;

  arr[1][2] = 30;

  arr[1][3] = 40;

  Which two statements, when inserted independently at line // insert code here, enable the code to compile?

  A. int [] [] arr = null;
  B. int [] [] arr = new int [2];
  C. int [] [] arr = new int [2] [ ];
  D. int [] [] arr = new int [] [4];
  E. int [] [] arr = new int [2] [0];
  F. int [] [] arr = new int [0] [4];
  C. int [] [] arr = new int [2] [ ];
  E. int [] [] arr = new int [2] [0];

• Question 310:

  Given:

  

  A. Ym Xm2
  B. Ym Xm1
  C. Compilation fails
  D. A ClassCastException is thrown at runtime
  B. Ym Xm1