public static boolean isBlank(final Collection<String> c) {
        if (c == null || c.isEmpty()) {
            return false;
        }
        for (final String text : c) {
            if (isNotBlank(text)) {
                return false;
            }
        }
        return true;
    }
public static boolean isBlank ( final Collection < String > c ) { if ( c == null || c . isEmpty ( ) ) { return false ; } for ( final String text : c ) { if ( isNotBlank ( text ) ) { return false ; } } return true ; }
Check if a collection of a string is blank.

@param c
@return