public void setQuestionDifferences(java.util.Collection<QuestionDifference> questionDifferences) {
        if (questionDifferences == null) {
            this.questionDifferences = null;
            return;
        }

        this.questionDifferences = new java.util.ArrayList<QuestionDifference>(questionDifferences);
    }
<p>
List of question differences.
</p>

@param questionDifferences
       List of question differences.
aws-java-sdk-wellarchitected/src/main/java/com/amazonaws/services/wellarchitected/model/PillarDifference.java