https://github.com/evmcl/evlibjava
A collection of reusable tools and utilities that I found I was often re-implementing in different Java projects.
Highlights include:
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Common string handling routines.
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Common string escaping for HTML, URLs and others.
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Thread-safe JOptionPane wrapper.
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Various file and I/O utilities.
and plenty more.
See the javadoc for all the details.
Released under a BSD style license.