WildcardCharPrimitive.java

class WildcardCharPrimitive {
    static interface Predicate<T> {
        boolean apply(T t);
    }

    abstract static class Matcher {

        public abstract boolean matches(char character);
    }

    public static void forPredicate(final Predicate<? super Character> predicate) {

        new Matcher() {
            //  this tests default type hierarchy visitPrimitive_Wildcard
            public boolean matches(char c) {
                //  this will happen when a type system does not have an EXPLICIT_LOWER_BOUND
                //  that matches the default for char c
                @SuppressWarnings("argument.type.incompatible")
                boolean value = predicate.apply(c);
                return value;
            }
        };
    }
}