can a server and client application communicate using strings. for example say server sends ok and error for each request received.......


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depending on what you mean by "send", of course.
That's pretty much how 99% of network protocols work (simplified of course, the actual stuff that's sent is a lot more complex in many cases).

That's how AOL's protocol (TOC) works.

String msg = "this is a message";

//write it out

//recipient reading back in
byte[] bytes = new byte[in.available()];

String incoming = new String(bytes);

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