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

Question

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

Answer 1

Solution with StringBuilder:

value = new StringBuilder()
                .append(value.substring(0, 1).toUpperCase())
                .append(value.substring(1))
                .toString();

.. based on previous answers