public void setSortBy(String sortBy) {
        this.sortBy = sortBy;
    }
<p>
Specifies the field to sort results by. If you specify <code>SortBy</code>, you must also specify
<code>SortOrder</code>.
</p>

@param sortBy
       Specifies the field to sort results by. If you specify <code>SortBy</code>, you must also specify
       <code>SortOrder</code>.
@see SortBy
aws-java-sdk-acm/src/main/java/com/amazonaws/services/certificatemanager/model/ListCertificatesRequest.java