Question

我想将整数映射到Java中的枚举。整数必须是键，而枚举是值。我见过的所有示例都将枚举作为值，将整数作为键。我有：

enum CardStatus {
    UNKNOWN, // 0 should map to this
    PENDING, // 1 should map to this
    ACTIVE // 2 should map to this

    public CardStatus getCardStatus(int cardStatus) {
        // e.g. cardStatus of 1 would return PENDING
    }
}

如何调用getCardStatus()并返回一个CardStatus枚举？例如。 getCardStatus(2)将返回ACTIVE

Answer 1

您可以将getCardStatus()设为静态：

enum CardStatus {
    UNKNOWN, // 0 should map to this
    PENDING, // 1 should map to this
    ACTIVE; // 2 should map to this

    public static CardStatus getCardStatus(int cardStatus) {
        return CardStatus.values()[cardStatus];
    }
}

并使用它：

System.out.println(CardStatus.getCardStatus(0));

将Java枚举映射为整数

1 个答案: