how to determine if jar or class file is executable

[kaith]

How can I determine if a particular class file/jar file is directly
executable, meaning it has a main etc.

 

[Roedy Green]

How can I determine if a particular class file/jar file is directly
executable, meaning it has a main etc.

You can read and parse the manifest. It is just a text file entry. I
don't know of a more direct way. It still won't necessarily execute.

 

[Sandip Chitale]

You can read and parse the manifest. It is just a text file entry. I
don't know of a more direct way. It still won't necessarily execute.

To read the manifest use

http://java.sun.com/j2se/1.4.2/docs/api/java/util/jar/JarFile.html#getManifest()

For the class you could use reflection to see is a method

public static void main(String[] args)

is present.