• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other Pie Elite all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Jeanne Boyarsky
  • Ron McLeod
  • Paul Clapham
  • Liutauras Vilda
Sheriffs:
  • paul wheaton
  • Rob Spoor
  • Devaka Cooray
Saloon Keepers:
  • Stephan van Hulst
  • Tim Holloway
  • Carey Brown
  • Frits Walraven
  • Tim Moores
Bartenders:
  • Mikalai Zaikin

encapsulation-doubt

 
Greenhorn
Posts: 24
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Given the following program:

1.public class MyCircle
2.{
3.public double radius;
4.public double diameter;
5.
6.public void setRadius(double radius)
7.{
8.this.radius=radius;
9.this.diameter=radius*2;
10.}
11.public double getRadius()
12.{
13.return radius;
14.}
15.}

Which statement is true?

a) MyCircle is fully encapsulated
b) The diameter is guarenteed to be twice the radius
c)Lines 8 and 9 should be in a synchronized block to ensure encapsulation
d)The radius of a Mycircle object can be set without affecting its diameter

According to the mock exam, the Answer is b.

But isnt b wrong. radius being a public variable can be modified by anyone. So how is this behaviour guaranteed. I feel d shud be the answer.. Any comments?
 
Ranch Hand
Posts: 286
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
you have totally reasons...
d is right

arno
[ April 09, 2006: Message edited by: Arno Reper ]
 
Ranch Hand
Posts: 163
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
yes,
option 'd' is correct.
 
reply
    Bookmark Topic Watch Topic
  • New Topic