public Set keySet ( final boolean includeDefaults ) { if ( includeDefaults ) { Set set = new HashSet ( ) ; set . addAll ( defaults . keySet ( ) ) ; set . addAll ( super . keySet ( ) ) ; return Collections . synchronizedSet ( set ) ; } return super . keySet ( ) ; }
Returns a set of keys for all entries in this group and optionally all of the keys in the defaults map .