--- a/src/main/java/jp/ac/u_ryukyu/ie/cr/shoshi/jungle/transaction/DefaultTreeNode.java	Wed Dec 24 15:05:09 2014 +0900
+++ b/src/main/java/jp/ac/u_ryukyu/ie/cr/shoshi/jungle/transaction/DefaultTreeNode.java	Wed Dec 24 16:14:42 2014 +0900
@@ -8,7 +8,7 @@
 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.TreeNode;
 import jp.ac.u_ryukyu.ie.cr.shoshi.jungle.store.impl.logger.OperationLog;
 
-public class DefaultTreeNode implements TreeNode
+public class DefaultTreeNode implements TreeNode, Comparable
 {
 	//private final DefaultNode wrap;
 	private List<TreeNode> children;
@@ -51,5 +51,11 @@
 		return new DefaultTreeNode(children,attrs);
 	}
 
+  @Override
+  public int compareTo(Object o) {
+   
+    return  o.hashCode() - this.hashCode();
+  }
+
 	
 }