implementazione di linked tree. manca il tostring

exceptions/UndeletableNodeException.java

@@ -0,0 +1,17 @@
+package exceptions;
+
+/**
+ * Created with MONSTER.
+ * User: xgiovio
+ * Date: 05/03/14
+ * Time: 0.09
+ */
+public class UndeletableNodeException extends RuntimeException {
+
+    public UndeletableNodeException(){
+        super("Undeletable Node");
+    }
+    public UndeletableNodeException(String msg){
+        super(msg);
+    }
+}