Provides one interface and many abstract classes that
Swing uses to provide its pluggable look-and-feel capabilities. Its
classes are subclassed and implemented by look-and-feel UIs like Basic
and metal. This package is only used by look-and-feel developers who
cannot create a new look-and-feel by subclassing existing
look-and-feel components (such as Basic or metal).
@since JDK1.2