public UsagePlan withApiStages(ApiStage... apiStages) {
        if (this.apiStages == null) {
            setApiStages(new java.util.ArrayList<ApiStage>(apiStages.length));
        }
        for (ApiStage ele : apiStages) {
            this.apiStages.add(ele);
        }
        return this;
    }
<p>
The associated API stages of a usage plan.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setApiStages(java.util.Collection)} or {@link #withApiStages(java.util.Collection)} if you want to
override the existing values.
</p>

@param apiStages
       The associated API stages of a usage plan.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-api-gateway/src/main/java/com/amazonaws/services/apigateway/model/UsagePlan.java