title: How to get an internal IP address?
body: <p>First of all my programming language is Java. I created a simple chat program using sockets. It works pretty good.</p>
  
  <p>I tried it on my computer (localhost) between two terminal instances.</p>
  
  <p>I want to try it out on my laptop, or on another computer. For this I need the client's internal IP address.</p>
  
  <p>How to figure out client's internal IP address using Java?</p>
  
  <p>I specially want to get it out with Java, not using CMD, or something like this. I mean - that's not just a constant string.</p>