diff --git a/tech/Java.wiki b/tech/Java.wiki
index dfbe09d..a59ebc0 100644
--- a/tech/Java.wiki
+++ b/tech/Java.wiki
@@ -5,17 +5,20 @@ can run on almost anything.
 
 == Data structures ==
 
-| C++ DS        | Java DS   | Notes                                       |
-| Vector        | ArrayList | Threadsafe                                  |
-| Vector        | Vector    | Not threadsafe; deprecated                  |
-| Deque         | Deque     |                                             |
-| List          | ArrayList | Both linked lists                           |
-| Map           | TreeMap   | Red-black tree                              |
-| Set           | TreeSet   | Red-black tree                              |
-| unordered_set | Hashset   | Hashtable                                   |
-| unordered_map | Hashmap   | Non blocking but race conditions can occour |
-| unordered_map | Hashtable | Threadsafe but blocking; deprecated         |
-
+| C++ DS        | Java DS       | Notes                                                               |
+| Vector        | ArrayList     | Threadsafe                                                          |
+| Vector        | Vector        | Not threadsafe; deprecated                                          |
+| Deque         | Deque         |                                                                     |
+| Stack         | Stack         | Stack implementation using a vector                                 |
+| List          | ArrayList     | Both linked lists; Singly linked                                    |
+| List          | LinkedList    | Doubly linked list                                                  |
+| Map           | TreeMap       | Red-black tree                                                      |
+| Set           | TreeSet       | Red-black tree                                                      |
+| unordered_set | Hashset       | Hashtable                                                           |
+| unordered_map | Hashmap       | Non blocking but race conditions can occour                         |
+| unordered_map | Hashtable     | Threadsafe but blocking; deprecated                                 |
+| N/A           | LinkedHashMap | LRUCache; Hash table that knows order of elements inserted/accessed |
+| N/A           | LinkedHashSet | LRUCache; Hash set that knows order of elements inserted/accessed   |
 
 
 
@@ -28,10 +31,25 @@ can run on almost anything.
         public MyClass(){
             //constructor code here
         }
-        
-        
+    }
+  }}}
+
+=== Deconstructor/Finalize ===
+
+finalize provides security and is called by the garbage collector. We can call
+it directly to clean up the object. All exceptions thrown by it are ignored by
+the garbage collector.
+
+{{{
+    public class MyClass{
+        public MyClass(){
+            //constructor code here
+        }
+
+        protected void finalize(){
+            //clean up code here
+        }
     }
   }}}
 
 
-