Creating a server with channels

Title says it all. I'm a bit perplexed as to how I am going to accomplish this. I had envisioned it kind of like this:
GameServer class contains an array of Channel classes which contain an array of Connections. Connections extend thread.
However, it seems I can't have an array of Threads (I get a "can not cast from void to Connection" error) which is really odd...is there another way to go about this?

Thanks for your help so far. In online games, they usually have channels which are basically little groups of users that can interact with each other. One server may have many "channels". For example, a server with 10 people may have those people spread across different channels. 5 users may be in channel 1, 2 in channel 2, 0 in channel 3, and the rest in channel 4. However, they're still on the same server but they can only see people within their channel.
I have no problems creating the Thread array but I get an error when I assign something to an index of that array. The error says something like "Can not cast from void to Thread"

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Creating a server with channels

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