Replacing chars in strings

Here is the situation:

[code]

int x=4

char letter1='Z'

String word1="blah blah"

/code]

I was wonering if the was an easy way of replacing a character in a string with another at a ceratin point in the string. In this case, I want a string that would say "blahZblah". Thanks.

[319 byte] By [TheRealBillCosbya] at [2007-10-2 10:17:01]