public java.util.List<String> getAddPrincipals() {
        return addPrincipals;
    }
<p>
The principals to add to the cross-account attachment. A principal is an account or the Amazon Resource Name
(ARN) of an accelerator that the attachment gives permission to work with resources from another account. The
resources are also listed in the attachment.
</p>
<p>
To add more than one principal, separate the account numbers or accelerator ARNs, or both, with commas.
</p>

@return The principals to add to the cross-account attachment. A principal is an account or the Amazon Resource
        Name (ARN) of an accelerator that the attachment gives permission to work with resources from another
        account. The resources are also listed in the attachment.</p>
        <p>
        To add more than one principal, separate the account numbers or accelerator ARNs, or both, with commas.
aws-java-sdk-globalaccelerator/src/main/java/com/amazonaws/services/globalaccelerator/model/UpdateCrossAccountAttachmentRequest.java