public void setSubject(java.util.Collection<String> subject) {
        if (subject == null) {
            this.subject = null;
            return;
        }

        this.subject = new java.util.ArrayList<String>(subject);
    }
<p>
The subject line of the message.
</p>

@param subject
       The subject line of the message.
aws-java-sdk-sesv2/src/main/java/com/amazonaws/services/simpleemailv2/model/MessageInsightsFilters.java