我有以下處理代碼EligibilityType：public enum EligibilityType {    E (EligibilityTypeEnum.ELIGIBLE),    I (EligibilityTypeEnum.INELIGIBLE);    private final EligibilityTypeEnum eligibilityTypeEnum;    private EligibilityType(EligibilityTypeEnum eligibilityTypeEnum) {        this.eligibilityTypeEnum = eligibilityTypeEnum;    }    public EligibilityTypeEnum toEligibilityTypeEnum() {        return eligibilityTypeEnum;    }}我了解到，所有沒有價值“E”的東西都應該設置為EligibilityTypeEnum.INELIGIBLE.這就是我所說的：...List<Workout> workouts = workoutResults.getWorkout();for(int i = 0; i< workouts.size(); ++i) {    ...    stin.getWorkouts().get(i).setEligibilityType(EligibilityType.valueOf(workouts.get(i).getRecommendation()).toEligibilityTypeEnum());    ...}現在，如果workouts.get(i).getRecommendation()返回“C”，代碼就會爆炸。有沒有人看到任何其他方式來實現這一點除了try-catch？有沒有辦法在枚舉中設置默認值？