How to capitalize the first letter of word in a string using Java?

Example strings

one thousand only
two hundred
twenty
seven

How do I change the first character of a string in capital letter and not change the case of any of the other letters?

After the change it should be:

One thousand only
Two hundred
Twenty
Seven

Note: I don't want to use the apache.commons.lang.WordUtils to do this.

Solution 1:

If you only want to capitalize the first letter of a string named input and leave the rest alone:

String output = input.substring(0, 1).toUpperCase() + input.substring(1);

Now output will have what you want. Check that your input is at least one character long before using this, otherwise you'll get an exception.

Solution 2:

public String capitalizeFirstLetter(String original) {
    if (original == null || original.length() == 0) {
        return original;
    }
    return original.substring(0, 1).toUpperCase() + original.substring(1);
}

Just... a complete solution, I see it kind of just ended up combining what everyone else ended up posting =P.