• 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:
  • Tim Cooke
  • Campbell Ritchie
  • Ron McLeod
  • Liutauras Vilda
  • Jeanne Boyarsky
Sheriffs:
  • Junilu Lacar
  • Rob Spoor
  • Paul Clapham
Saloon Keepers:
  • Tim Holloway
  • Tim Moores
  • Jesse Silverman
  • Stephan van Hulst
  • Carey Brown
Bartenders:
  • Al Hobbs
  • Piet Souris
  • Frits Walraven

Why final variable in enhanced for isn't acting final?

 
Ranch Hand
Posts: 144
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator


What's the output and why? (choose all that apply)

A) Compilation fails because Integer is a reserved keyword
B) Compilation error (attempting to re-assingn a final varialble)
C) 234
D) 2340
E) Runtime Exception
F) Other

Why is the answer D? Doesn't "final" modifier on Line 222 makes it impossible to re-assign "i"?
[ June 10, 2006: Message edited by: Firas Zureikat ]
 
Ranch Hand
Posts: 40
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator


The enhanced for-loop as shown above is actually just syntactic sugar for something along the lines of:



That is, 'i' is a local variable (local to the for-loop) and it is not been assigned a value twice so it's just fine.

To finish this up. The following will *not* compile, because 'i' is assigned a value twice.

Assignment 1: the result of getCharArray(arr)[someindex].
Assignment 2: i = i+1
 
Firas Zuriekat
Ranch Hand
Posts: 144
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Ok, thanks..so it's just local variable and each iteration of the loop a new different final local variable is created.
 
Consider Paul's rocket mass heater.
reply
    Bookmark Topic Watch Topic
  • New Topic