This package defines sets of characters. All classes in this package are
immutable. They are designed to efficiently determine set membership and not
for retrieval of members.
The following key classes deserve special mention:
- CharSet is the base class for all Character sets. It also implements
StringSet.
- DefinedCharSets contains a lot of definition of CharSet instances.
Have a look at what is there before defining your own.
The remainder of the classes are subclasses of CharSet.