common utility classes that work under swing java 1.5+

common utility classes that work under Swing Java 1.3+

common utility classes that work under java 1.1+
BraceBalancer

bracebalancer helps find unbalanced {} [] or () in java, css, c, c++ etc source.
Boyer

Fast string search (indexOf) using the Boyer-Moore algorithm.
Batik

Java to let you create a custom utility to find and delete all junk files.