public WhatIfForecastExportSummary withWhatIfForecastArns(String... whatIfForecastArns) {
        if (this.whatIfForecastArns == null) {
            setWhatIfForecastArns(new java.util.ArrayList<String>(whatIfForecastArns.length));
        }
        for (String ele : whatIfForecastArns) {
            this.whatIfForecastArns.add(ele);
        }
        return this;
    }
<p>
An array of Amazon Resource Names (ARNs) that define the what-if forecasts included in the export.
</p>
<p>
<b>NOTE:</b> This method appends the values to the existing list (if any). Use
{@link #setWhatIfForecastArns(java.util.Collection)} or {@link #withWhatIfForecastArns(java.util.Collection)} if
you want to override the existing values.
</p>

@param whatIfForecastArns
       An array of Amazon Resource Names (ARNs) that define the what-if forecasts included in the export.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-forecast/src/main/java/com/amazonaws/services/forecast/model/WhatIfForecastExportSummary.java