data_structures_free

net/datastructures/NonEmptyTreeException.java

@@ -0,0 +1,11 @@
+package net.datastructures;
+/**
+ * Runtime exception thrown when one tries to create the root of a
+ * tree that is not empty.
+ */
+
+public class NonEmptyTreeException extends RuntimeException {  
+  public NonEmptyTreeException(String err) {
+    super(err);
+  }
+}