public void setPlacementId(String placementId) {
        this.placementId = placementId;
    }
<p>
A unique identifier for a game session placement to stop.
</p>

@param placementId
       A unique identifier for a game session placement to stop.
aws-java-sdk-gamelift/src/main/java/com/amazonaws/services/gamelift/model/StopGameSessionPlacementRequest.java