Thanks.  I thought that would be the case.  I'm looking at serializing a 
subtree and replacing it with a node that says where it can be found 
again.  At the moment my Tree class has Node as an inner class.  I'll 
have to pull them apart again.


Keiron Liddle wrote:

> Hi Peter,
> An inner class is actually a separate class that contains a reference 
> to the containing class.
> When the class is serialized it will serialize that reference (since I 
> presume it is not transient).
> If the class is static then it will not have a rreference to the 
> containing class but that may not be suitable for other reasons.

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