1 背景

 如下两个枚举类，依次遍历两个枚举类所有的status和desc通过下划线组成字符串放到同一个list里面，并过滤掉长度不等于7的字符串

@Getter
@AllArgsConstructor
public enum EmailStatusEnum {
    TO_SEND(0, "邮件待发送"),
    SEND_SUC(1, "邮件已发送"),
    SEND_ING(2, "邮件发送中"),
    SEND_FAIL(3, "邮件发送失败");

    private int status;
    private String desc;
}

@Getter
@AllArgsConstructor
public enum PhoneStatusEnum {
    TO_SEND(0, "短信待发送"),
    SEND_SUC(1, "短信已发送"),
    SEND_ING(2, "短信发送中"),
    SEND_FAIL(3, "短信发送失败");

    private int status;
    private String desc;
}

2.实现

2.1 直接遍历-贫血模型

 public static void main(String[] args) {
        List<String> list = Arrays.stream(EmailStatusEnum.values()).map(e -> e.getStatus() + "_" + e.getDesc()).filter(s -> s.length() == 7).collect(Collectors.toList());
        list.addAll(Arrays.stream(PhoneStatusEnum.values()).map(e -> e.getStatus() + "_" + e.getDesc()).filter(s -> s.length() == 7).collect(Collectors.toList()));
        System.out.println(list);
    }

2.2 实现接口-充血模型

2.2.1 提供一个接口

public interface SendService {
    /**
     * 获取描述
     *
     * @return id_desc
     */
    String getStatusDesc();

    static List<String> getSDList(SendService[]... sendServices) {
        return Arrays.stream(sendServices).flatMap(Arrays::stream)
                .map(SendService::getStatusDesc).filter(s -> s.length() == 7).collect(Collectors.toList());
    }
}

2.2.2 实现SendService

@Getter
@AllArgsConstructor
public enum EmailStatusEnum implements SendService {
    TO_SEND(0, "邮件待发送"),
    SEND_SUC(1, "邮件已发送"),
    SEND_ING(2, "邮件发送中"),
    SEND_FAIL(3, "邮件发送失败");

    private int status;
    private String desc;

    @Override
    public String getStatusDesc() {
        return this.status + "_" + this.desc;
    }
}

@Getter
@AllArgsConstructor
public enum PhoneStatusEnum implements SendService {
    TO_SEND(0, "短信待发送"),
    SEND_SUC(1, "短信已发送"),
    SEND_ING(2, "短信发送中"),
    SEND_FAIL(3, "短信发送失败");

    private int status;
    private String desc;

    @Override
    public String getStatusDesc() {
        return this.status + "_" + this.desc;
    }
}

2.2.3 调用

public static void main(String[] args) {
        List<String> list = SendService.getSDList(EmailStatusEnum.values(), PhoneStatusEnum.values());
        System.out.println(list);
    }