public String getAccountId() {
        return this.accountId;
    }
<p>
Specifies the 12-digit account ID number of the Amazon Web Services account that you want to access or modify
with this operation. To use this parameter, the caller must be an identity in the <a
href="https://docs.aws.amazon.com/organizations/latest/userguide/orgs_getting-started_concepts.html#account"
>organization's management account</a> or a delegated administrator account. The specified account ID must be a
member account in the same organization. The organization must have <a
href="https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_org_support-all-features.html">all
features enabled</a>, and the organization must have <a
href="https://docs.aws.amazon.com/organizations/latest/userguide/using-orgs-trusted-access.html">trusted
access</a> enabled for the Account Management service, and optionally a <a
href="https://docs.aws.amazon.com/organizations/latest/userguide/using-orgs-delegated-admin.html">delegated
admin</a> account assigned.
</p>
<p>
This operation can only be called from the management account or the delegated administrator account of an
organization for a member account.
</p>
<note>
<p>
The management account can't specify its own <code>AccountId</code>.
</p>
</note>

@return Specifies the 12-digit account ID number of the Amazon Web Services account that you want to access or
        modify with this operation. To use this parameter, the caller must be an identity in the <a href=
        "https://docs.aws.amazon.com/organizations/latest/userguide/orgs_getting-started_concepts.html#account"
        >organization's management account</a> or a delegated administrator account. The specified account ID
        must be a member account in the same organization. The organization must have <a href=
        "https://docs.aws.amazon.com/organizations/latest/userguide/orgs_manage_org_support-all-features.html"
        >all features enabled</a>, and the organization must have <a
        href="https://docs.aws.amazon.com/organizations/latest/userguide/using-orgs-trusted-access.html">trusted
        access</a> enabled for the Account Management service, and optionally a <a
        href="https://docs.aws.amazon.com/organizations/latest/userguide/using-orgs-delegated-admin.html"
        >delegated admin</a> account assigned.</p>
        <p>
        This operation can only be called from the management account or the delegated administrator account of
        an organization for a member account.
        </p>
        <note>
        <p>
        The management account can't specify its own <code>AccountId</code>.
        </p>
aws-java-sdk-account/src/main/java/com/amazonaws/services/account/model/AcceptPrimaryEmailUpdateRequest.java