title: Separate files for class definition and declaration in Java
body: <p>I'm a C++ programmer currently learning Java and I'm wondering if OOP in Java follows the same principle of separation of class definition and declaration as C++ does, ie. place them both in separate files. I've had a look around the internet, including the Android developer website, and all the code I've come across has the definition and declaration carried out at the same time. </p>
  
  <p>Is this simply one of the difference between development in C++ and development in Java, or are the sources I've been looking at simply doing things that way to limit the complexity of their code for posting on the internet? I have seen declarations and definitions combined in some C++ documentation, though I know it is bad practice to do so.</p>