...
KeyStore loadKeyStore (String ksFile, String pwd) {
   try {
      KeyStore ks = KeyStore.getInstance( KeyStore.getDefaultType() );
      InputStream stream = new FileInputStream( ksFile );

      /** verify the integrity of a keystore */
      ks.load( stream, pwd.toCharArray() );
   } catch (Exception ex) {
      ex.printStackTrace();
   }
}

void storeKeyStore (KeyStore ks, String ksFile, String pwd) {
   try {
      OutputStream stream = new FileOutputStream(ksFile);
      ks.store( stream, pwd.toCharArray() );
   } catch (Exception ex) {
       ex.printStackTrace();
   }
}

void printKeyEntry (KeyStore ks, String alias, String pwd) {
   System.out.println( "Private key: " + ks.getKey(alias,pwd.toCharArray() );
   Certificate certs[] = ks.getCertificateChain(alias);
   for (int i = 0; i < certs.length; i++) {
      if (c intanceof X509Certificate) {
         X509Certificate c = (X509Certificate) certs[i];
         System.out.println(
            "Subject DN: " + c.getSubjectDN() + ", Issuer DN: " + c.getIssuerDN()
         );
      }
   }
}

void printCertificateEntry (KeyStore ks, String alias) {
   Certificate c = ks.getCertificate(alias);
   if (c instanceof X509Certificate) {
      X509Certificate x509 = (X509Certificate) c;
      System.out.println(
         "Subject DN: " + x509.getSubjectDN() "Issuer DN: " + x509.getIssuerDN()
      );
   }
}

public static void main (String[] args) {
   String ksFile = System.getProperty("user.home")
      + File.separator + ".keystore";

   KeyStore ks = loadKeyStore( ksFile, "secret password" );
   String alias = "edek";
   if ( ks.isKeyEntry(alias) ) {
      printKeyEntry(
         ks,alias, "my very secret password protecting private key"
      );
   } else if ( ks.isCertificateEntry(alias) ) {
      printCertificateEntry( ks,alias );
   } else {
      System.out.println(
         "There is no entry for the alias: \"" + alias + "\" in the keystore"
      );
   }
}