title: Performance issue in using two java class in single java file
body: <p>I just wanted to know that is there any performance issue in</p>
  
  <p>1)Using two classes in single java file.</p>
  
  <p>2)Using inner java class.</p>
  
  <p>I want to use it for internal data structure and supporting class.
  Also please tell me which one will be better in terms of performance?</p>