title: How to read classes from a jar
body: <p>I am trying to read classes from a jar.
  So I started by extracting the files under my jar, I am using JAD decompiler.
  The decompiler works, for example I have written</p>
  <pre><code>System.out.println()
  </code></pre>
  <p>And I have tried to open the class System and it shows the implementation of the class.
  When trying to read the .class under my jar, I have tried to put the .class under a package, but I can not see the .class under the package, so I have tried to open it like this : File&gt;Open File.., I get the error :
  The Class File Viewer cannot handle the given input ('org.eclipse.ui.ide.FileStoreEditorInput').</p>
  <p>How can I see my .class?</p>