Question

I have a jar file and I want to know which all classes are within it. Is there any way I can do that?

Answer 1

How about using jar

jar tf jar-file

• The t option indicates that you want
  to view the table of contents of the
  JAR file.
• The f option indicates that the JAR
  file whose contents are to be viewed
  is specified on the command line.
  Without the f option, the Jar tool
  would expect a filename on stdin.
• The jar-file argument is the filename
  (or path and filename) of the JAR
  file whose contents you want to view.

and if you want to list just the .class files you can filter the result using grep as:

jar tf jar-file | grep '\.class$'