public java.util.List<ActiveInstance> getActiveInstances() {
        if (activeInstances == null) {
            activeInstances = new com.amazonaws.internal.SdkInternalList<ActiveInstance>();
        }
        return activeInstances;
    }
<p>
The running instances. This list is refreshed periodically and might be out of date.
</p>

@return The running instances. This list is refreshed periodically and might be out of date.
aws-java-sdk-ec2/src/main/java/com/amazonaws/services/ec2/model/DescribeFleetInstancesResult.java