public void setRegistrationTypes(java.util.Collection<String> registrationTypes) {
        if (registrationTypes == null) {
            this.registrationTypes = null;
            return;
        }

        this.registrationTypes = new java.util.ArrayList<String>(registrationTypes);
    }
<p>
The type of registration form. The list of <b>RegistrationTypes</b> can be found using the
<a>DescribeRegistrationTypeDefinitions</a> action.
</p>

@param registrationTypes
       The type of registration form. The list of <b>RegistrationTypes</b> can be found using the
       <a>DescribeRegistrationTypeDefinitions</a> action.
aws-java-sdk-pinpointsmsvoicev2/src/main/java/com/amazonaws/services/pinpointsmsvoicev2/model/DescribeRegistrationTypeDefinitionsRequest.java