| Name | Type | Parent | Since | Detail |
| PhantomReference | Class |
java.lang.ref.Reference | 1.2 | Detail |
| Reference | Class | java.lang.Object | 1.2 | Detail |
| ReferenceQueue | Class | java.lang.Object | 1.2 | Detail |
| SoftReference | Class |
java.lang.ref.Reference | 1.2 | Detail |
| WeakReference | Class |
java.lang.ref.Reference | 1.2 | Detail |
