public void setPlacementStrategy(java.util.Collection<PlacementStrategy> placementStrategy) {
        if (placementStrategy == null) {
            this.placementStrategy = null;
            return;
        }

        this.placementStrategy = new com.amazonaws.internal.SdkInternalList<PlacementStrategy>(placementStrategy);
    }
<p>
The task placement strategy objects to update the service to use. If no value is specified, the existing
placement strategy for the service will remain unchanged. If this value is specified, it will override the
existing placement strategy defined for the service. To remove an existing placement strategy, specify an empty
object.
</p>
<p>
You can specify a maximum of five strategy rules for each service.
</p>

@param placementStrategy
       The task placement strategy objects to update the service to use. If no value is specified, the existing
       placement strategy for the service will remain unchanged. If this value is specified, it will override the
       existing placement strategy defined for the service. To remove an existing placement strategy, specify an
       empty object.</p>
       <p>
       You can specify a maximum of five strategy rules for each service.
aws-java-sdk-ecs/src/main/java/com/amazonaws/services/ecs/model/UpdateServiceRequest.java