Java枚举的使用与反射应用方式

// 定义表示星期的枚举类型
public enum Weekday {
    MONDAY, // 星期一
    TUESDAY, // 星期二
    WEDNESDAY, // 星期三
    THURSDAY, // 星期四
    FRIDAY, // 星期五
    SATURDAY, // 星期六
    SUNDAY // 星期日
}

// 定义表示季节的枚举类型，每个季节携带中文名称
public enum Season {
    SPRING(1,"春天"), 
    SUMMER(2,"夏天"), 
    AUTUMN(3,"秋天"), 
    WINTER(4,"冬天"); 

	private Integer index; 
    private String chineseName; 

    public Integer getIndex() {return index;}
    public String getChineseName() {
        return chineseName;
    }
}

    public static String getByCode(Integer index){
        for(Season season : values()){
            if (season.getIndex() == index) {
                return getIndex.getChineseName();
            }
        }
        return null;
    }

public class EnumReflectionExample {

    enum Day {
        MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
    }

    public static void main(String[] args) {
        // 获取枚举类对象
        Class<Day> enumClass = Day.class;

        // 获取枚举常量
        Day[] days = enumClass.getEnumConstants();
        for (Day day : days) {
            System.out.println(day);
        }
    }
}

public class EnumReflectionExample {

    enum Day {
        MONDAY("星期一"), TUESDAY("星期二"), WEDNESDAY("星期三"), THURSDAY("星期四"), FRIDAY("星期五"), SATURDAY("星期六"), SUNDAY("星期日");

        private String chineseName;

        Day(String chineseName) {
            this.chineseName = chineseName;
        }

        public String getChineseName() {
            return chineseName;
        }
    }

    public static void main(String[] args) {
        // 获取枚举类对象
        Class<Day> enumClass = Day.class;

        // 获取枚举属性
        try {
            Field chineseNameField = enumClass.getDeclaredField("chineseName");
            chineseNameField.setAccessible(true);

            for (Day day : Day.values()) {
                String chineseName = (String) chineseNameField.get(day);
                System.out.println(day + " 的中文名是：" + chineseName);
            }
        } catch (NoSuchFieldException | IllegalAccessException e) {
            e.printStackTrace();
        }
    }
}

public class EnumReflectionExample {

    enum Day {
        MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;

        public void sayHello() {
            System.out.println("今天是：" + this);
        }
    }

    public static void main(String[] args) {
        // 动态调用枚举方法
        try {
            Day monday = Day.valueOf("MONDAY");
            monday.sayHello();
        } catch (IllegalArgumentException e) {
            e.printStackTrace();
        }
    }
}

public class EnumReflectionExample {

    enum Day {
        MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY;

        private String description;

        public String getDescription() {
            return description;
        }

        public void setDescription(String description) {
            this.description = description;
        }
    }

    public static void main(String[] args) {
        // 动态设置枚举属性
        Day monday = Day.MONDAY;
        monday.setDescription("星期一");
        System.out.println(monday.getDescription());
    }
}

public class EnumReflectionExample {

    enum Day {
        MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
    }

    public static void main(String[] args) {
        // 枚举类型判断
        Class<?> enumClass = Day.class;
        if (enumClass.isEnum()) {
            System.out.println("这是一个枚举类型");
        } else {
            System.out.println("这不是一个枚举类型");
        }
    }
}

public class EnumReflectionExample {

    enum Day {
        MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY, SATURDAY, SUNDAY
    }

    public static void main(String[] args) {
        // 枚举信息获取
        Class<Day> enumClass = Day.class;
        System.out.println("枚举类的简单名称：" + enumClass.getSimpleName());
        System.out.println("枚举类的全限定名称：" + enumClass.getName());
    }
}