public AutoScalingGroup withPlacementGroup(String placementGroup) {
        setPlacementGroup(placementGroup);
        return this;
    }
<p>
The name of the placement group into which to launch your instances, if any.
</p>

@param placementGroup
       The name of the placement group into which to launch your instances, if any.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-autoscaling/src/main/java/com/amazonaws/services/autoscaling/model/AutoScalingGroup.java