Deleting extra characters

Is there a way to delete extra characters in a StringBuffer after the first occurance? For example, if I wanted to delete all comma's after the first occurance in a string, this seems to work:
          if(custName.lastIndexOf(",") > custName.indexOf(","))
               custName.replace(' ,' , ' ');
But how would you do this in a StringBuffer? I have tried using something like this:
int numComma = 0;
for(int i = 0; i < letter.length(); i++)
if(letter.charAt(begin) == ',')
     numComma ++;
if( letter.charAt(begin) == ',' && numComma > 1)
     letter = letter.deleteCharAt(begin);
but it deletes all commas, including the first occurrance..Would you use the same approach to delete extra spaces between words?[if there is more than one space] Any suggestions would be appreciated..

if you use java.util.stringtokenizer you can tokenize by your delimiter.

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Deleting extra characters

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