If user inputs random letter, how do I change all of that letter in a given string?

Question

I am trying to figure out how to use character wrapping to mutate a string based on user input. If string is \'Bob loves to build building\' and user enters \'b\' I have to mak

Answer 1

Check replace method:

public String replace(char oldChar, char newChar)

Returns a new string resulting from replacing all occurrences of oldChar in this string with newChar.

For more details see [String#replace](http://docs.oracle.com/javase/6/docs/api/java/lang/String.html#replace(char, char))

EDIT:

class ReplaceDemo
{
    public static void main(String[] args)
    {
        String inputString = "It is that, that's it.";
        Char replaceMe = 'i';
        Char replaceWith = 't';

        String newString = inputString.Replace(replaceMe.toUpperCase(), replaceWith);
        newString = newString.Replace(replaceMe.toLowerCase(), replaceWith);
    }
}

Does that solve your problem?