title: calling methods between classes
body: <p>Is there a way to call a method in one class from another class.   I could have say 5 classes and more than one may want to perform the same operation.   So can I have one file (class??) with these common methods and call into that?   If so what is the necessary modifier for these 'common' methods - public, final??</p>
  
  <p>If anyone can point me to a suitable tutorial I would be grateful - in this instance I havent had much useful from Google
  Thanks
  Ron</p>