使用 ENUM 将默认值设置为不合格

Question

我有以下处理代码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，所有没有价值“E”的东西都应该设置为EligibilityTypeEnum.INELIGIBLE.这就是我所说的：...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());    ...}现在，如果workouts.get(i).getRecommendation()返回“C”，代码就会爆炸。有没有人看到任何其他方式来实现这一点除了try-catch？有没有办法在枚举中设置默认值？

Answer 1

您可以在EligibilityType地图中拥有所有可能的值

public static final Map<String, EligibilityType> ALL_MAP = Arrays.stream(values())
            .collect(Collectors.toMap(Enum::toString, Function.identity()));

那么你可以优雅地处理默认情况

EligibilityType.ALL_MAP.getOrDefault(someString, EligibilityType.DEFAULT)