Java Strings

[Lucky Singh]

I have a String "predpred". I want to replace the second "red" with "e" and return the new string "predpe".

public String replace(String word, String replace, String replaceWith)
{
///
}

How do I do that?

[Stan James]

As of 1.4 String has a replace method that might do the job for you. If you're on an older JVM that doesn't have replace() the usual trick is:

use indexOf to get position of the old string
result = substring of original up to the position
       + new string
       + substring of the original after the old string

Do you know the "p" part ahead of time? It's easy to search for "predpred" with indexof. If you also have to handle "gredgred" or "shredshred" then I guess you'd have to search for the "red" only. Find it once, then use that position plus one as a start to find it again.

Play with String.indexof and String.substring and see if you can get something going. Feel free to post more code for comment.

[Niki Nono]

Try
String.lastindexOf("red")
but to replace the string you will have to use stans approach.
you will have to play around with String.substring().
try it out and let us know if you have any problems.