Java Security Cert Java by API

import java.io.FileInputStream;
import java.security.cert.CertificateFactory;
import java.security.cert.X509CRL;
public class MainClass {
  public static void main(String[] args) throws Exception {
    CertificateFactory cf = CertificateFactory.getInstance("X.509");
    FileInputStream in = new FileInputStream(args[0]);
    X509CRL crl = (X509CRL) cf.generateCRL(in);
    System.out.println("type = " + crl.getType());
    System.out.println("version = " + crl.getVersion());
    System.out.println("issuer = " + crl.getIssuerDN().getName());
    System.out.println("signing algorithm = " + crl.getSigAlgName());
    System.out.println("this update = " + crl.getThisUpdate());
    System.out.println("next update = " + crl.getNextUpdate());
    in.close();
  }
}