protected void setFieldNameValueSeparator(String fieldNameValueSeparator) {
        if (fieldNameValueSeparator == null) {
            fieldNameValueSeparator = "";
        }
        this.fieldNameValueSeparator = fieldNameValueSeparator;
    }
<p>Sets the field name value separator text.</p>

<p><code>null</code> is accepted, but will be converted to
an empty String.</p>

@param fieldNameValueSeparator  the new field name value separator text
android/android_framework/base/src/main/java/lang3/builder/ToStringStyle.java