What are the methods that come with Java enumeration classes?

1. valueOf() method

This is a static method that passes in a string (the name of the enumeration) to get the enumeration class. If the name passed in does not exist, an error will be reported.

public static void main(String[] args) throws Exception{
    System.out.println(PayTypeEnum.valueOf("ALI_PAY"));
    System.out.println(PayTypeEnum.valueOf("HUAWEI_PAY"));
}

2. values() method

Returns an array containing all enumeration data in the enumeration class.

public static void main(String[] args) throws Exception {
    PayTypeEnum[] payTypeEnums = PayTypeEnum.values();
    for (PayTypeEnum payTypeEnum : payTypeEnums) {
        System.out.println("code: " + payTypeEnum.getCode() + ",describe: " + payTypeEnum.getDescribe());
    }
}

3. ordinal() method

By default, the enumeration class will provide a default order for the defined enumeration, and the ordinal() method can Returns the order of the enumeration.

public static void main(String[] args) throws Exception {
    PayTypeEnum[] payTypeEnums = PayTypeEnum.values();
    for (PayTypeEnum payTypeEnum : payTypeEnums) {
        System.out.println("ordinal: " + payTypeEnum.ordinal() + ", Enum: " + payTypeEnum);
    }
}
/**
ordinal: 0, Enum: ALI_PAY
ordinal: 1, Enum: WECHAT_PAY
ordinal: 2, Enum: UNION_PAY
*/

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