public void setAlarmArn(String alarmArn) {
        this.alarmArn = alarmArn;
    }
<p>
The Amazon Resource Name (ARN) of the alarm.
</p>

@param alarmArn
       The Amazon Resource Name (ARN) of the alarm.
aws-java-sdk-cloudwatch/src/main/java/com/amazonaws/services/cloudwatch/model/CompositeAlarm.java