I teach java already as 2 months and I realized that I did not understand anything. It seems like I understand, but when I sit down for PC programming, I understand that I don’t even know how to start. I decided to make a simple messenger of messages for practice, so this is what I need to teach what to write the messenger.

Closed due to the fact that it is necessary to reformulate the question so that the participants can give an objectively correct answer to the participants Yuriy SPb ♦ , aleksandr barakin , VenZell , zRrr , tutankhamun 24 Mar '16 at 19:13 .

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    Sockets, for simplicity, you can start with input via the console, then write a GUI. - Vartlok

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Take the book "Learning Java, 2nd Edition," the authors of Sierra, Bates, and write the program they offer in the book. There, the process of creating a Swing application with chat that supports file transfer is explained in detail. Each step is described in detail. To write an application as a whole, you will need to go through the entire book, after which you will understand a great deal and significantly deepen your knowledge. It is read very easily, it is written in an accessible way and with humor.

The cover of the book "Learning Java"