public java.util.List<PlacementGroup> getPlacementGroups() {
        if (placementGroups == null) {
            placementGroups = new com.amazonaws.internal.SdkInternalList<PlacementGroup>();
        }
        return placementGroups;
    }
<p>
Information about the placement groups.
</p>

@return Information about the placement groups.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/DescribePlacementGroupsResult.java