Java tutorial
import java.io.IOException; import java.util.Date; import java.util.Enumeration; import java.util.jar.JarEntry; import java.util.jar.JarFile; public class Main { public static void main(String[] args) throws IOException { JarFile jf = new JarFile(args[0]); Enumeration e = jf.entries(); while (e.hasMoreElements()) { JarEntry je = (JarEntry) e.nextElement(); String name = je.getName(); Date lastModified = new Date(je.getTime()); long uncompressedSize = je.getSize(); long compressedSize = je.getCompressedSize(); System.out.println(lastModified); System.out.println(uncompressedSize); System.out.println(compressedSize); } } }