public void setWhatIfForecastArn(String whatIfForecastArn) {
        this.whatIfForecastArn = whatIfForecastArn;
    }
<p>
The Amazon Resource Name (ARN) of the what-if forecast.
</p>

@param whatIfForecastArn
       The Amazon Resource Name (ARN) of the what-if forecast.
aws-java-sdk-forecast/src/main/java/com/amazonaws/services/forecast/model/WhatIfForecastSummary.java