Oracle Oracle Certifications 1Z0-808 Questions & Answers

• Question 361:

  Given the code fragment:

  public class Test {

  public static void main(String[] args) {

  boolean isChecked = false;

  int arry[] = {1,3,5,7,8,9};

  int index = arry.length;

  while ( ) {

  if (arry[index-1] % 2 ==0) {

  isChecked = true;

  }

  }

  System.out.print(arry(index]+", "+isChecked));

  }

  }

  Which set of changes enable the code to print 1, true?

  A. Replacing with index > 0 and replacing with index--;

  B. Replacing with index > 0 and replacing with --index;

  C. Replacing with index > 5 and replacing with --index ;

  D. Replacing with index and replacing with --index ;

  Correct Answer: A

  Note: Code in B (code2 is --index;). also works fine.

• Question 362:

  A method is declared to take three arguments. A program calls this method and passes only two arguments. What is the results?

  A. Compilation fails.

  B. The third argument is given the value null.

  C. The third argument is given the value void.

  D. The third argument is given the value zero.

  E. The third argument is given the appropriate falsy value for its declared type. F) An exception occurs when the method attempts to access the third argument.

  Correct Answer: A

• Question 363:

  Which two actions will improve the encapsulation of a class?

  A. Changing the access modifier of a field from public to private

  B. Removing the public modifier from a class declaration

  C. Changing the return type of a method to void

  D. Returning a copy of the contents of an array or ArrayList instead of a direct reference

  Correct Answer: AD

  Reference: http://www.tutorialspoint.com/java/java_access_modifiers.htm

• Question 364:

  Given:

  public class ComputeSum {

  public int x;

  public int y;

  public int sum;

  public ComputeSum (int nx, int ny) {

  x = nx; y =ny;

  updateSum();

  }

  public void setX(int nx) { x = nx; updateSum();}

  public void setY(int ny) { x = ny; updateSum();}

  void updateSum() { sum = x + y;}

  }

  This class needs to protect an invariant on the sum field.

  Which three members must have the private access modifier to ensure that this invariant is maintained?

  A. The x field

  B. The y field

  C. The sum field

  D. The ComputerSum ( ) constructor

  E. The setX ( ) method

  F. The setY ( ) method

  Correct Answer: CEF

  Explanation: The sum field and the two methods (setX and SetY) that updates the sum field.

• Question 365:

  Given the following array:

  

  Which two code fragments, independently, print each element in this array?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  E. Option E

  F. Option F

  Correct Answer: BE

  Explanation: All the remaining options have syntax errors

• Question 366:

  Which statement best describes encapsulation?

  A. Encapsulation ensures that classes can be designed so that only certain fields and methods of an object are accessible from other objects.

  B. Encapsulation ensures that classes can be designed so that their methods are inheritable.

  C. Encapsulation ensures that classes can be designed with some fields and methods declared as abstract.

  D. Encapsulation ensures that classes can be designed so that if a method has an argument MyType x,

  any subclass of MyType can be passed to that method.

  Correct Answer: A

• Question 367:

  Given:

  

  The class is poorly encapsulated. You need to change the circle class to compute and return the area instead.

  Which two modifications are necessary to ensure that the class is being properly encapsulated?

  A. Remove the area field.

  B. Change the getArea( ) method as follows: public double getArea ( ) { return Match.PI * radius * radius; }

  C. Add the following method: public double getArea ( ) {area = Match.PI * radius * radius; }

  D. Change the cacess modifier of the SerRadius ( ) method to be protected.

  Correct Answer: BD

• Question 368:

  Given the code fragment:

  

  What is the result?

  A. 10 8 6 4 2 0

  B. 10 8 6 4 2

  C. AnArithmeticException is thrown at runtime

  D. The program goes into an infinite loop outputting: 10 8 6 4 2 0. . .

  E. Compilation fails

  Correct Answer: B

• Question 369:

  Given:

  And the code fragment:

  

  And the code fragment:

  

  Which code fragment, when inserted at line 14, enables the code to print Mike Found?

  A. int f = ps.indexOf {new patient ("Mike")};

  B. int f = ps.indexOf (patient("Mike"));

  C. patient p = new Patient ("Mike"); int f = pas.indexOf(P)

  D. int f = ps.indexOf(p2);

  Correct Answer: D

• Question 370:

  Given:

  

  Which code fragment should you use at line n1 to instantiate the dvd object successfully?

  

  A. Option A

  B. Option B

  C. Option C

  D. Option D

  Correct Answer: C