public CreateAssociationRequest withScheduleExpression(String scheduleExpression) {
        setScheduleExpression(scheduleExpression);
        return this;
    }
<p>
A cron expression when the association will be applied to the targets.
</p>

@param scheduleExpression
       A cron expression when the association will be applied to the targets.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/CreateAssociationRequest.java