public void setAccountId(String accountId) {
        this.accountId = 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>

@param accountId
       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