public void setContactIds(java.util.Collection<String> contactIds) {
        if (contactIds == null) {
            this.contactIds = null;
            return;
        }

        this.contactIds = new java.util.ArrayList<String>(contactIds);
    }
<p>
The Amazon Resource Names (ARNs) of the contacts to include in the updated rotation.
</p>
<p>
The order in which you list the contacts is their shift order in the rotation schedule.
</p>

@param contactIds
       The Amazon Resource Names (ARNs) of the contacts to include in the updated rotation. </p>
       <p>
       The order in which you list the contacts is their shift order in the rotation schedule.
aws-java-sdk-ssmcontacts/src/main/java/com/amazonaws/services/ssmcontacts/model/UpdateRotationRequest.java