Groovy 处理 Boolean
| Type | Condition For Truth |
|---|---|
| Boolean | True |
| Collection | Not Empty |
| Character | Value Not 0 |
| CharSequence | Length greater than 0 |
| Emumeration | Has More elements |
| Iterator | Has Next |
| Number | Double value not 0 |
| Map | Not empty |
| Matcher | At least one match |
| Object[] | Length greater than 0 |
| Any other Type | Reference not null |