public void setInstances(java.util.Collection<Instance> instances) {
        if (instances == null) {
            this.instances = null;
            return;
        }

        this.instances = new com.amazonaws.internal.SdkInternalList<Instance>(instances);
    }
<p>
The instances that are currently in the warm pool.
</p>

@param instances
       The instances that are currently in the warm pool.
aws-java-sdk-autoscaling/src/main/java/com/amazonaws/services/autoscaling/model/DescribeWarmPoolResult.java