java - Need the explanation of code of string replacement using String buffer -

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I got the following code from the site, but I can not understand it clearly whether someone helps me understand the code ? Replaces the code string. It replaces Strontotopelease with the replacement string. This character is substituting but I could not understand its detail. 

  string strain = "al% hand% receivable number%% exam% is correct."; String stringolailease = "% return number%"; String replacement string = "12345"; String replaced string = null; Int idx = strIn.lastIndexOf (stringToReplace); If (idx! = -1) {stringbuffer result = new stringbuffer (strIn); Results.replace (idx, idx + stringToReplace.length (), substitution string); While ((idx = strIn.lastIndexOf (stringToReplace, idx-1)) -1) {results.replace (idx, idx + stringToReplace.length (), substitution string); } // system.out.printLN (result.trustring);; ReplacedString = results.toString (); } System.out.println (Replaced string);   
 Output is  
  Al% hand 12345% exam% has arrived OK.    
 
 
 First, you have the input string  strIn , then Instead of changing  stringToReplace  and replace string  replaceString .  Replace strings  may be related to  replaceString ,  
 you search for the last occurrence of the string to replace with  lastIndexOf < . This gives you the last index, on which the replacement string starts in the original string.  
 If you got to change the string (if index is not -1), then you use the  StringBuffer  method  to replace the string  For  idx  to  idx + stringToReplace.length ()  (to change the string to its full length, starts with the found index).  
 Again you can check that the string is still in the result to change, and whenever it happens, you change it.  
 Then you strip the result (a  StringBuffer ) and output it.

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