1
 catch (Exception ex) {
            if (condition) {
                return 1;
            } else {
                if (ex instanceof ConcreteException1) {
                    return 2;
                } else {
                    return 3;
                }
  2
   catch (Exception ex) {
            if (condition) {
                return 1;
            } else {
               try {
                    throw ex;
                } catch (ConcreteException1 e) {
                    return 2;
                } catch (Exception e) {
                    return 3;
                }