Question

Currently, I have an array of Strings, each with random characters in it that are random in length. I want to replace every “A” with an “X”, how would I come about doing this?

Example:

String str = "ABCDEFGAZYXW";

I want the String to become "XBCDEFGXZYXW". I tried to use:

str.replaceAll("A", "X");

But it does not change the string. Any help is greatly appreciated!

Answer 1

str = str.replaceAll("A", "X");

The replaceAll method doesn’t change the string (strings in Java are immutable) but creates a new String object and returns it as a result of the function call. In this way we change the reference to the new object where the old one is not changed but simply not referenced.