[c:\tmp] jython
*sys-package-mgr*: processing modified jar, 'C:\AspectJ1.1\lib\aspectjrt.jar'
Jython 2.1 on java1.3.1_02 (JIT: null)
Type "copyright", "credits" or "license" for more information.
>>> from java.io import *
>>> from java.util import*
>>> m = ArrayList()
>>> m.add("Foo")
1
>>> m.add("Bar")
1
>>> m
[Foo, Bar]
>>> baos = ByteArrayOutputStream()
>>> oos = ObjectOutputStream(baos)
>>> oos.writeObject(m)
>>> oos.close()
>>> dir(baos.class)
['__init__', 'reset', 'size', 'toByteArray', 'toString', 'write', 'writeTo']
>>> baos.toByteArray()
array([-84, -19, 0, 5, 115, 114, 0, 19, 106, 97,
  118, 97, 46, 117, 116, 105, 108, 46, 65, 114, 114,
  97, 121, 76, 105, 115, 116, 120, -127, -46, 29,
  -103, -57, 97, -99, 3, 0, 1, 73, 0, 4, 115, 105,
  122, 101, 120, 112, 0, 0, 0, 2, 119, 4, 0, 0, 0,
  10, 116, 0, 3, 70, 111, 111, 116, 0, 3, 66, 97,
  114, 120], byte)
>>> bais = ByteArrayInputStream(baos.toByteArray())
>>> ois = ObjectInputStream(bais)
>>> x = ois.readObject()
>>> x
[Foo, Bar]
>>> m
[Foo, Bar]