Major updates to all classes to add Java Collection compatibility, also unified under Interfaces to make testing cleaner

git-svn-id: https://java-algorithms-implementation.googlecode.com/svn/trunk@404 032fbc0f-8cab-eb90-e552-f08422b9a96a

Author: phishman3579

src/com/jwetherell/algorithms/data_structures/BTree.java

@@ -451,10 +451,9 @@ public int size() {
     }
 
     /**
-     * Validate the tree for all B-Tree invariants.
-     * 
-     * @return True if tree is valid.
+     * {@inheritDoc}
      */
+    @Override
     public boolean validate() {
         if (root == null) return true;
         return validateNode(root);