title: My .jar file is not executing
body: <p>I have created a basic Noughts and Crosses game where it takes text input from the user to determine where the X/O will be placed (everything is printed on-screen using System.out) and it works fine within BlueJ, however when I create a .jar file it won't bring up a screen or do anything.</p>
  
  <p>Any idea on what I am doing wrong?</p>
  
  <p>Edit:</p>
  
  <p>this is running on windows 7 and I'm attempting to run the application by double-clicking the .jar file.</p>
  
  <p>I learned basic java through uni around 6 years ago and am re-teaching myself hence the uncertainty with running the application. To clarify, any executable file needs to contain a self-created manifest?</p>