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

        this.whatIfForecastArns = new java.util.ArrayList<String>(whatIfForecastArns);
    }
<p>
An array of Amazon Resource Names (ARNs) that define the what-if forecasts included in the export.
</p>

@param whatIfForecastArns
       An array of Amazon Resource Names (ARNs) that define the what-if forecasts included in the export.
aws-java-sdk-forecast/src/main/java/com/amazonaws/services/forecast/model/WhatIfForecastExportSummary.java