一文搞懂Java项目中枚举的定义与使用

public static final int WOMAN = 0;
public static final int MAN = 1;

    
public enum TopicTypeEnum {
    
    FILL_IN_THE_BLANK(0, "填空题"),
    
    JUDGE(1, "判断题"),
    
    SINGLE_CHOICE(2, "单选题"),
    
    MULTIPLE_CHOICE(3, "多选题"),
    
    BRIEF_ANSWER(4, "简答题"),
    
    QUESTioNS_AND_ANSWERS(5, "问答题"),
    
    DISCUSS(6, "论述题"),
    
    COMPUTE(7, "计算题"),
     
    //最后一个类型必须要用分号结束
    DRAW_PICTURE(9, "画图题");

    
    private final Integer code;

    
    private final String name;

    public static TopicTypeEnum getByCode(Integer code) {
        if (null == code) {
            return null;
        }
        for (TopicTypeEnum status : TopicTypeEnum.values()) {
            if (status.getCode().intValue() == code.intValue()) {
                return status;
            }
        }
        return null;
    }

    public static TopicTypeEnum getByName(String name) {
        for (TopicTypeEnum status : TopicTypeEnum.values()) {
            if (status.getName().equals(name)) {
                return status;
            }
        }
        return null;
    }

    public static List<NameCode> getNameCode() {
        return Stream.of(TopicTypeEnum.values())
            .map(item -> new NameCode(item.getCode(), item.getName()))
            .collect(Collectors.toList());
    }

    TopicTypeEnum (Integer code, String name) {
        this.code = code;
        this.name = name;
    }

    public Integer getCode() {
        return code;
    }

    public String getName() {
        return name;
    }

    
    public static List<Map<String, Object>> toList() {
        List<Map<String, Object>> list = new ArrayList<>();
        for (TopicTypeEnum item : TopicTypeEnum.values()) {
            Map<String, Object> map = new HashMap<>();
            map.put("code", item.getCode());
            map.put("name", item.getName());
            list.add(map);
        }
        return list;
    }