public NullValueFormatConfiguration withNullString(String nullString) {
        setNullString(nullString);
        return this;
    }
<p>
Determines the null string of null values.
</p>

@param nullString
       Determines the null string of null values.
@return Returns a reference to this object so that method calls can be chained together.
aws-java-sdk-quicksight/src/main/java/com/amazonaws/services/quicksight/model/NullValueFormatConfiguration.java