public void setScheduleExpression(String scheduleExpression) {
        this.scheduleExpression = scheduleExpression;
    }
<p>
A cron expression that specifies a schedule when the association runs. The schedule runs in Coordinated Universal
Time (UTC).
</p>

@param scheduleExpression
       A cron expression that specifies a schedule when the association runs. The schedule runs in Coordinated
       Universal Time (UTC).
aws-java-sdk-ssm/src/main/java/com/amazonaws/services/simplesystemsmanagement/model/Association.java