title: Java Eclipse executable jar file
body: <p>I am new to eclipse + Java. I am trying to create executable jar file with eclipse
  export option. It works very well. But in my project, I have almost 10 packages (my own) and 4 main classes. I want to create a executable jar file that can execute any of main class from 4 main classes. </p>
  
  <p>For example: Double click write class name and run that class</p>