public ReservationUtilizationGroup withKey(String key) {
        setKey(key);
        return this;
    }
<p>
The key for a specific reservation attribute.
</p>

@param key
       The key for a specific reservation attribute.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-costexplorer/src/main/java/com/amazonaws/services/costexplorer/model/ReservationUtilizationGroup.java