1.什么是枚舉類？枚舉類的對象聲明的修飾符有哪些？
枚舉類：類中的對象個數(shù)是確定的，有限個
修飾符：public static final

2.如何自定義枚舉類？

// 自定義枚舉類
class Season {
    //1.聲明Season對象的屬性：private final修飾
    private final String seasonName;
    private final String seasonDesc;

    //2.私有化類的構造器，并給對象屬性賦值
    private Season(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    //3.提供當前枚舉類的多個對象：public static final修飾的
    public static final Season SPRING = new Season("春天", "這是春天的描述");
    public static final Season SUMMER = new Season("夏天", "這是夏天的描述");
    public static final Season AUTUMN = new Season("秋天", "這是秋天的描述");
    public static final Season WINTER = new Season("冬天", "這是冬天的描述");

    //4.獲取枚舉類對象的屬性
    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }

    //5.提供toString()方法
    @Override
    public String toString() {
        return "Season{" +
                "seasonName='" + seasonName + '\'' +
                ", seasonDesc='" + seasonDesc + '\'' +
                '}';
    }
}

3.如何使用enum關鍵字定義枚舉類？

//使用enum關鍵字定義枚舉類
enum Season1 {
    //1.提供當前枚舉類的對象，多個對象之間用”，“隔開，末尾對象用”;“結束
    SPRING("春天", "這是春天的描述"),
    SUMMER("夏天", "這是夏天的描述"),
    AUTUMN("秋天", "這是秋天的描述"),
    WINTER("冬天", "這是冬天的描述");

    //2.聲明Season對象的屬性：private final修飾
    private final String seasonName;
    private final String seasonDesc;

    //3.私有化類的構造器，并給對象屬性賦值
    private Season1(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    //4.獲取枚舉類對象的屬性
    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }
}

4.如何讓枚舉類對象分別實現(xiàn)接口？

interface Info {
    void show();
}

//使用enum關鍵字定義枚舉類
enum Season1 implements Info {
    //1.提供當前枚舉類的對象，多個對象之間用”，“隔開，末尾對象用”;“結束
    SPRING("春天", "這是春天的描述") {
        @Override
        public void show() {
            System.out.println("春");
        }
    },
    SUMMER("夏天", "這是夏天的描述") {
        @Override
        public void show() {
            System.out.println("夏");
        }
    },
    AUTUMN("秋天", "這是秋天的描述") {
        @Override
        public void show() {
            System.out.println("秋");
        }
    },
    WINTER("冬天", "這是冬天的描述") {
        @Override
        public void show() {
            System.out.println("冬");
        }
    };

    //2.聲明Season對象的屬性：private final修飾
    private final String seasonName;
    private final String seasonDesc;

    //3.私有化類的構造器，并給對象屬性賦值
    private Season1(String seasonName, String seasonDesc) {
        this.seasonName = seasonName;
        this.seasonDesc = seasonDesc;
    }

    //4.獲取枚舉類對象的屬性
    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }
}