Two Iterators on the Same Collection

I posted this one on the Java Collections Framework forum but there don't seem to be many people there so let me post this here, too.
I want to use two iterators at the same time on a single collection. They are like two trains going one after another. If I use the iterator supplied by Java, however, if one iterator structurally modifies the underlying collection, the other throws ConcurrentModificationException.I want to avoid this. I want both iterators to modify the underlying collection freely, and when the collection was modified by one, I want the other to know what happened and what to do, rather than throwing an exception. How can I do this? Can I just manipulate somewhat on the Java iterator, or must I make an iterator implementation that does what I want from the scratch?

I'm writing a flow analysis module of a compiler. I'm not totally sure what optimizer does, but it needs to manipulate the list of instructions, which involves removing and adding instructions into the list. Some time we may need two iterators that cooperate together to find out when we can remove an instruction, for example. Or, one iterator does the analysis and removal, while the other may do some cleanup work. (I say again I'm not totally sure what optimizer does.) Some guy suggested using visitor pattern, but after some investigation (of the visitor pattern stuff) I thought iterator that behaved more smartly was more relevant. Or maybe not.

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try this links :
http://www.codeproject.com/Articles/19071/Quick-tool-A-minimalistic-Telnet-library
http://stackoverflow.com/questions/25116077/send-and-receive-commands-via-telnet-in-c-sharp
http://stackoverflow.com/questions/12283241/ssh-to-server-then-telnet-to-device

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