• 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

SubString Index query

 
Ranch Hand
Posts: 1087
Java Windows
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
Hi,

How is the line

being read. The String "mail: " is it being counted as 0,1,2,3,4,5,6(Index Position) or only 0. If its considering only 0 why is that so?



 
Greenhorn
Posts: 3
  • Mark post as helpful
  • send pies
    Number of slices to send:
    Optional 'thank-you' note:
  • Quote
  • Report post to moderator
You should start at the inner-most method call:
When you call indexOf() on a String (in this case, "mail: vishal.hegde@xyz.com"), you get the index of the first occurrance of "mail: " in that string. Since "mail: " is at the beginning, indexOf() returns 0.

Then there's the next method call:
As you probably noticed, I replaced the call to indexOf() with the result to make it easier to read. Calling substring() on a String returns a part of that string. Since you're using the String.substring( int ) version of the method, you get the part of the string starting at index 6 (0+6 = 6). Let's see which part that is:
According to the code block above, substring() should return the string " vishal.hegde@xyz.com". Note that the extra whitespace is preserved at the beginning of the string.
 
Consider Paul's rocket mass heater.
reply
    Bookmark Topic Watch Topic
  • New Topic