Java Final Arguments

When should I declare method parameters as final?

• This prevents the parameter from being reassigned but does not make it immutable
• It is mandatory to make the parameter available to anonymous inner classes

 UnaryOperator bind ( final BinaryOperator binOp, final Object boundLeftArg) {
   return new UnaryOperator() {
        public Object apply(Object arg) {
               return binOp.apply(boundleftArg, arg);
        }
   };
}

See: http://c2.com/cgi/wiki?JavaFinalArguments