diff --git a/DoggieAnimation.java b/00/DoggieAnimation.java
similarity index 100%
rename from DoggieAnimation.java
rename to 00/DoggieAnimation.java
diff --git a/IntBag.java b/00/IntBag.java
similarity index 100%
rename from IntBag.java
rename to 00/IntBag.java
diff --git a/StdDraw.java b/00/StdDraw.java
similarity index 100%
rename from StdDraw.java
rename to 00/StdDraw.java