Index: Lib/javaos.py
===================================================================
--- Lib/javaos.py	(revision 3325)
+++ Lib/javaos.py	(working copy)
@@ -128,6 +128,35 @@ def rename(path, newpath):
     if not File(path).renameTo(File(newpath)):
         raise OSError(0, "couldn't rename file", path)
 
+def walk(top, topdown=True, onerror=None):
+    from os.path import join, isdir, islink
+    try:        
+        names = listdir(top)
+    except error, err:
+        if onerror is not None:
+            onerror(err)
+        return
+
+    dirs, nondirs = [], []
+    for name in names:
+        if isdir(join(top, name)):
+            dirs.append(name)
+        else:
+            nondirs.append(name)
+
+    if topdown:
+        yield top, dirs, nondirs
+    for name in dirs:
+        path = join(top, name)
+        if not islink(path):
+            for x in walk(path, topdown, onerror):
+                yield x
+    if not topdown:
+        yield top, dirs, nondirs
+
+__all__.append("walk")
+
+
 def rmdir(path):
     if not File(path).delete():
         raise OSError(0, "couldn't delete directory", path)