public final static boolean emptyString(Object o) { boolean expr = (o == null || (o instanceof String && ((String)o).length() ==0));
public final static boolean emptyString(String s) { boolean expr = (s == null || s.length() == 0);
    public final static boolean emptyString(Object o) {        boolean expr =            (o == null || (o instanceof String && ((String)o).length() ==0));        return expr;    }