public void setTreatmentId(String treatmentId) {
        this.treatmentId = treatmentId;
    }
<p>
The unique identifier for the campaign treatment that the activity applies to. A treatment is a variation of a
campaign that's used for A/B testing of a campaign.
</p>

@param treatmentId
       The unique identifier for the campaign treatment that the activity applies to. A treatment is a variation
       of a campaign that's used for A/B testing of a campaign.
aws-java-sdk-pinpoint/src/main/java/com/amazonaws/services/pinpoint/model/ActivityResponse.java