These Java Utilities were mainly written by Stephen Ostermiller, but many others listed below have given much needed help.
OstermillerUtil Java Utilities Copyright (c) 2001-2020 by Stephen Ostermiller and other contributors
The OstermillerUtils library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License or (at your option) any later version.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
License FAQs - Why GPL? How about the LGPL or something else?