public boolean contains(final Character c) {
		return contains(c.charValue());
	}
Test whether this character set contains the given character {@code c}.

@param c the character to test.
@return {@code true} if this character set contains the given character,
         {@code false} otherwise.
@throws NullPointerException if the given character {@code c} is
         {@code null}.
jenetics/src/main/java/io/jenetics/util/CharSeq.java