枚举树形结构

一、实现父子级枚举树形结构

1.创建一个实体类

代码如下（示例）：

import lombok.Data;
import java.util.List;

/**
 * @ClassName EnumInfo
 * @Description TODO
 * @Author 码头土夫子_Gao
 * @Date 2021/12/16 8:40
 * @Version 1.0
 **/
@Data
public class EnumInfo {

    private  Integer code;

    private String remark;

    private List<EnumInfo> children;
    
}

2.父类枚举类NoticeTypeEnum

代码如下（示例）：

import java.util.*;

public enum NoticeTypeEnum {

    SYSTEM(1, "系统通知") {
        @Override
        public List<MessageTypeEnum> getMessageTypes() {
            return Arrays.asList(MessageTypeEnum.ORDER, MessageTypeEnum.REFUND, MessageTypeEnum.AFTERSALE, MessageTypeEnum.COUPON);
        }
    },
    INTERACTION(2, "互动通知") {
        @Override
        public List<MessageTypeEnum> getMessageTypes() {
            return Arrays.asList(MessageTypeEnum.COMMENT, MessageTypeEnum.LIKE, MessageTypeEnum.REPLY);
        }
    },
    DELIVER(3, "物流通知") {
        @Override


        public List<MessageTypeEnum> getMessageTypes() {
            return Arrays.asList(MessageTypeEnum.SHIPMENTS, MessageTypeEnum.SIGNFOR);
        }
    },
    ACTIVITY(4, "活动通知") {
        @Override
        public List<MessageTypeEnum> getMessageTypes() {
            return Arrays.asList(MessageTypeEnum.ACTIVITY);
        }
    };

    private NoticeTypeEnum(Integer code, String remark) {
        this.code = code;
        this.remark = remark;
    }


    private Integer code;

    private String remark;

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }

    public abstract List<MessageTypeEnum> getMessageTypes();

    /**
     * @param code
     * @description: 通过code获取
     * @return: NoticeTypeEnum
     * @author: 码头土夫子_Gao
     * @Date: 2021/12/16 8:39
     */
    public static NoticeTypeEnum getEnumByCode(Integer code) {
        if (code != null) {
            for (NoticeTypeEnum instance : NoticeTypeEnum.values()) {
                if (code.equals(instance.code)) {
                    return instance;
                }
            }
        }
        return null;
    }

}

3.子类枚举类MessageTypeEnum

代码如下（示例）：

public enum MessageTypeEnum {

    ORDER(1, "订单提醒"),
    REFUND(2, "退款提醒"),
    AFTERSALE(4, "售后提醒"),
    COUPON(5, "优惠券提醒"),
    ACTIVITY(6, "活动通知"),
    COMMENT(7, "评论通知"),
    REPLY(8, "回复通知"),
    LIKE(9, "点赞通知"),
    SHIPMENTS(10, "发货通知"),
    SIGNFOR(11, "签收通知");

    private Integer code;
    private String remark;

    private MessageTypeEnum(Integer code, String remark) {
        this.code = code;
        this.remark = remark;
    }

    public Integer getCode() {
        return code;
    }

    public void setCode(Integer code) {
        this.code = code;
    }

    public String getRemark() {
        return remark;
    }

    public void setRemark(String remark) {
        this.remark = remark;
    }
}

4.main方法进行测试(我这里为了省事写在了实体类当中)

代码如下（示例）：

@Data
public class EnumInfo {

    private  Integer code;

    private String remark;

    private List<EnumInfo> children;

    public static void main(String[] args) {
        List<EnumInfo> enumInfos = new ArrayList<>();
        for (int i = 1; i <= NoticeTypeEnum.values().length; i++) {
            EnumInfo enumInfo = new EnumInfo();
            NoticeTypeEnum noticeTypeEnum = NoticeTypeEnum.getEnumByCode(i);
            enumInfo.setCode(noticeTypeEnum.getCode());
            enumInfo.setRemark(noticeTypeEnum.getRemark());
            enumInfo.setChildren(getMessageTypeEnumList(noticeTypeEnum.getMessageTypes()));
            enumInfos.add(enumInfo);
        }
        System.out.println("数据：" + JSON.toJSONString(enumInfos));
    }

    private static List<EnumInfo> getMessageTypeEnumList(List<MessageTypeEnum> messageTypeEnums) {
        List<EnumInfo> enumInfos = new ArrayList<>();
        for (MessageTypeEnum messageTypeEnum : messageTypeEnums) {
            EnumInfo enumInfo = new EnumInfo();
            enumInfo.setCode(messageTypeEnum.getCode());
            enumInfo.setRemark(messageTypeEnum.getRemark());
            enumInfos.add(enumInfo);
        }
        return enumInfos;
    }

}

5.返回数据

二、返回数据结构示意如下图

JSON格式数据

通过在线JSON转化以后如下

总结

枚举树形结构在实际场景运用也是很多的，实现多层嵌套可根据该Demo进行改造