title: For dummies approach to build image and run own code on Docker
body: <p>I am trying to work with Docker. I want to run a supersimple program on Docker (to get acquainted with Docker). </p>
  
  <p>I have gone through most of Dockers own tutorials, but did work with own code any where so I am left puzzled. When searching online there are a lot of hits (which i have attempted to understand), but most of them either involve more unknown tools (maven, springboot, django) or they are far too complicated. </p>
  
  <p>Say i have a helloworld.py (or helloworld.java). How do i do go about running it on Docker? * by running i mean upload and execute.</p>
  
  <p>Do i need to download java on docker? what sequence of steps are needed? 
  I know this is a "stupid" question, which is why i specified a dummies-approach.  </p>
  
  <p>Any help will greatly be appreciated. Even links that cover this (which i have not succeded in finding)</p>