public void setSubnetArns(java.util.Collection<String> subnetArns) {
        if (subnetArns == null) {
            this.subnetArns = null;
            return;
        }

        this.subnetArns = new java.util.ArrayList<String>(subnetArns);
    }
<p>
The subnet ARNs.
</p>

@param subnetArns
       The subnet ARNs.
aws-java-sdk-networkmanager/src/main/java/com/amazonaws/services/networkmanager/model/VpcAttachment.java