public String
toString() {
	StringBuffer sb = new StringBuffer();
	for (Iterator it = types.iterator(); it.hasNext(); ) {
		int t = ((Integer)it.next()).intValue();
		sb.append(Type.string(t));
		if (it.hasNext())
			sb.append(' ');
	}
	return sb.toString();
}
Routines for deal with the lists of types found in NSEC/NSEC3 records.

@author Brian Wellington
src/main/java/core/org/xbill/DNS/TypeBitmap.java