public String getAccountId() {
        return this.accountId;
    }
<p>
The <code>AccountId</code> value is the AWS account ID. This value must match the AWS account ID associated with
the credentials used to sign the request. You can either specify an AWS account ID or optionally a single '
<code>-</code>' (hyphen), in which case Amazon Glacier uses the AWS account ID associated with the credentials
used to sign the request. If you specify your account ID, do not include any hyphens ('-') in the ID.
</p>

@return The <code>AccountId</code> value is the AWS account ID. This value must match the AWS account ID
        associated with the credentials used to sign the request. You can either specify an AWS account ID or
        optionally a single '<code>-</code>' (hyphen), in which case Amazon Glacier uses the AWS account ID
        associated with the credentials used to sign the request. If you specify your account ID, do not include
        any hyphens ('-') in the ID.
aws-java-sdk-glacier/src/main/java/com/amazonaws/services/glacier/model/InitiateVaultLockRequest.java