Question

使用interface来访问项目常量这是我的界面

public interface ConstantValues {

    interface PaymentType   {
        public static final String CREDIT_CUSTOMER = "credit";
        public static final String CASH_CUSTOMER = "cash";
    }

    interface PaymentMethode    {
        public static final String CREDIT_CARD = "creditcard";
        public static final String VISA_CARD = "visacard";
        public static final String MASTER_CARD = "mastercard";
    }

}

我从java类中访问此值，如下所示

 ConstantValues.PaymentType.CREDIT_CUSTOMER

 or

 ConstantValues.PaymentType.VISA_CARD

但我想知道如何使用枚举来做到这一点，因为使用了定义常量的接口是不好的做法可以取悦任何人告诉我如何使用枚举以及如何从java类访问它？

Answer 1

你走了：

enum PaymentType   {
    CREDIT_CUSTOMER,
    CASH_CUSTOMER;
}

enum PaymentMethod    {
    CREDIT_CARD,
    VISA_CARD,
    MASTER_CARD;
}

使用它像：

PaymentMethod meth = PaymentMethod.VISA_CARD;

等

Answer 2

public class Enums {
    public enum Test {
        FIRST,
        SECOND,
        THIRD
    }

    public enum Test2 {
        FIRST("first"),
        SECOND("second"),
        THIRD("third");

        private final String value;

        Test2(String value) {
            this.value = value;
        }
    }

    public static void main(String[] args) {
        System.out.println(Enums.Test.FIRST);
        System.out.println(Enums.Test2.FIRST.value);
    }
}

如何使用枚举来定义常量值组

2 个答案: