import java.io.IOException;
import java.util.Enumeration;
import java.util.jar.JarEntry;
import java.util.jar.JarFile;
public class MainClass {
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();
long crc = je.getCrc();
System.out.println("Its CRC is " + crc);
String comment = je.getComment();
if (comment != null && !comment.equals("")) {
System.out.println(comment);
}
if (je.isDirectory()) {
System.out.println(name + " is a directory");
}
}
}
}