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Display properties of X509 Certificate

import java.io.FileInputStream; import java.math.BigInteger; import java.security.PublicKey; import java.security.cert.CertificateFactory; import java.security.cert.X509Certificate; public class MainClass {   public static void main(String args[]) throws Exception {     CertificateFactory cf = CertificateFactory.getInstance("X.509");     FileInputStream in = new FileInputStream(args[0]);     java.security.cert.Certificate c = cf.generateCertificate(in);     in.close();     X509Certificate t = (X509Certificate) c;     System.out.println(t.getVersion());     System.out.println(t.getSerialNumber().toString(16));     System.out.println(t.getSubjectDN());     System.out.println(t.getIssuerDN());     System.out.println(t.getNotBefore());     System.out.println(t.getNotAfter());     System.out.println(t.getSigAlgName());     byte[] sig = t.getSignature();     System.out.println(new BigInteger(sig).toString(16));     PublicKey pk = t.getPublicKey();     byte[] pkenc = pk.getEncoded();     for (int i = 0; i < pkenc.length; i++) {       System.out.print(pkenc[i] + ",");     }   } }