public TOTP build() {
        long time = System.currentTimeMillis();
        return new TOTP(generateTOTP(time), time, hmacShaAlgorithm, digits, timeStep);
    }
public TOTP build ( ) { long time = System . currentTimeMillis ( ) ; return new TOTP ( generateTOTP ( time ) , time , hmacShaAlgorithm , digits , timeStep ) ; }
Build a Time-based One-time Password {@link TOTP} using the current
system time (current time in milliseconds since the UNIX epoch). Note
that the builder instance can be reused for subsequent
configuration/generation calls.

@return a Time-based One-time Password {@link TOTP} instance.