枚举的写法，mark，自己还没在具体项目中用过

public enum CountryEnum{
    ONE(1,"齐"),TWO(2,"楚"),THREE(3,"燕"),FOUR(4,"赵"),FIVE(5,"魏"),SIX(6,"韩");

    private Integer retCode;
    private String retMessage;

    CountryEnum(Integer retCode, String retMessage) {
        this.retCode = retCode;
        this.retMessage = retMessage;
    }

    public static CountryEnum CountryEnum_foreach(int index){
        //返回数组
        CountryEnum[] countryEnums = CountryEnum.values();
        for (CountryEnum countryEnum : countryEnums) {
            if(countryEnum.getRetCode() == index){
                return countryEnum;
            }
        }
        return null;
    }

    public Integer getRetCode() {
        return retCode;
    }

    public String getRetMessage() {
        return retMessage;
    }
}