how to replace string in java?

Question

I have a String str = "a_bcde_fghij_k".

and I want to change it to "aBcdeFghijK"

If have a _ character, the next character will be change to uppercase and remove _ character.

How can I do this?

Answer 1

I suspect you'll need to just go through this character by character, building up the string as you go. For example:

public static String underscoreToCapital(String text) {
    // This will be a bit bigger than necessary, but that shouldn't matter.
    StringBuilder builder = new StringBuilder(text.length());
    boolean capitalizeNext = false;
    for (int i = 0; i < text.length(); i++) {
        char c = text.charAt(i);
        if (c == '_') {
            capitalizeNext = true;
        } else {
            builder.append(capitalizeNext ? Character.toUpperCase(c) : c);
            capitalizeNext = false;
        }
    }
    return builder.toString();
}