public void setAccountId(String accountId) {
        this.accountId = accountId;
    }
<p>
The Amazon Web Services account ID for the account that sent the invitation.
</p>

@param accountId
       The Amazon Web Services account ID for the account that sent the invitation.
aws-java-sdk-macie2/src/main/java/com/amazonaws/services/macie2/model/Invitation.java