public void setParticipantId(String participantId) {
        this.participantId = participantId;
    }
<p>
The ID of the sender in the session.
</p>

@param participantId
       The ID of the sender in the session.
aws-java-sdk-connectparticipant/src/main/java/com/amazonaws/services/connectparticipant/model/Item.java