question: @ SuppressWarnings ( "unchecked" ) public static Collection < X509Certificate > readCertificates ( String base64data ) throws Exception { try ( InputStream is = new ByteArrayInputStream ( decodeBase64 ( base64data ) ) ) { return ( Collection < X509Certificate > ) CERT_FACTORY . generateCertificates ( is ) ; } }
target:  Reads X509Certificate object from given base64 data.