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SubString Index query

Vishal Hegde
Ranch Hand

Joined: Aug 01, 2009
Posts: 1067


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?

http://www.lifesbizzare.blogspot.com || OCJP:81%
Thomas Kasene

Joined: Feb 21, 2013
Posts: 3
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.
It is sorta covered in the JavaRanch Style Guide.
subject: SubString Index query
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