public void setActivities(java.util.Collection<Activity> activities) {
        if (activities == null) {
            this.activities = null;
            return;
        }

        this.activities = new com.amazonaws.internal.SdkInternalList<Activity>(activities);
    }
<p>
The activities related to detaching the instances from the Auto Scaling group.
</p>

@param activities
       The activities related to detaching the instances from the Auto Scaling group.
aws-java-sdk-autoscaling/src/main/java/com/amazonaws/services/autoscaling/model/DetachInstancesResult.java