Can a thread do more than one thing at once?

Hey all,
I'm confused a little bit on how a thread might act in this situation:
I have a server-client setup. The thread on the Client sits and waits to receive instructions from the server. When it does, it manipulates some ArrayLists I have in the Client in different ways depending on what the instructions from the server were. What would happen if I sent two instructions from the server, one right after the other, and they both had to manipulate the same ArrayList. I was going to synchronize the methods operating on the arraylists, but I didn't know if that would work since it's really just one thread. But then, since it's just one thread, can it do more than one thing at a time? Or will it queue them up somehow? Thanks!
Matt

Rhesus21 wrote:
Hey all,
I'm confused a little bit on how a thread might act in this situation:
I have a server-client setup. The thread on the Client sits and waits to receive instructions from the server. In client-server applications, the clients make requests and the server performs them and sends back a response.
It appears you have a central "server" which sends back updates/instructions to the client in a server-push approach.
When it does, it manipulates some ArrayLists I have in the Client in different ways depending on what the instructions from the server were. What would happen if I sent two instructions from the server, one right after the other, and they both had to manipulate the same ArrayList. Are both instructions sent on the same connection? Does your client only read the next instruction after performing the previous one. Are you using multiple connections and do you create a thread for each connection?
I was going to synchronize the methods operating on the arraylists, but I didn't know if that would work since it's really just one thread. If you have only one thread you don't need to use synchronized.
But then, since it's just one thread, can it do more than one thing at a time? No.
Or will it queue them up somehow? Yes. Each connection has a buffer at both ends. When the buffers fill the sender blocks waiting for the receiver to read the data.

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