public void setAccountId(String accountId) {
        this.accountId = accountId;
    }
<p>
The account ID of the Security Hub administrator account that the invitation was sent from.
</p>

@param accountId
       The account ID of the Security Hub administrator account that the invitation was sent from.
aws-java-sdk-securityhub/src/main/java/com/amazonaws/services/securityhub/model/Invitation.java