fixed lru array delete cache

.gitignore

@@ -19,6 +19,7 @@
 *.tar.gz
 *.rar
 *.DS_Store
+*.exe
 
 # virtual machine crash logs, see http://www.java.com/en/download/help/error_hotspot.xml
 hs_err_pid*

java/06_linkedlist/LRUBasedArray.java

@@ -81,7 +81,8 @@ public class LRUBasedArray<T> {
      * @param object
      */
     public void removeAndCache(T object) {
-        value[--count] = null;
+        T key = value[--count];
+        holder.remove(key);
         cache(object, count);
     }