1. 私有化類構(gòu)造器哑芹，保證不能在類外部創(chuàng)建對(duì)象實(shí)例闪金。
2. 在類的內(nèi)部創(chuàng)建枚舉類的對(duì)象實(shí)例,聲明為private public staic final狗超。
3. 如果必要干茉，設(shè)置類屬性谴忧，屬性聲明為private final，也就沒有set方法了角虫，
   因?yàn)楦鱾€(gè)屬性值在對(duì)象實(shí)例創(chuàng)建的時(shí)候沾谓，就已經(jīng)被構(gòu)造器賦值了。

1. 聲明enum類

enum SeasonEnum{
    SPRING("spring","春暖花開"),
    SUMMER("summer", "烈日炎炎"),
    FALL ("autumn", "秋風(fēng)蕭瑟"),
    WINTER("winter","冰天雪地");
    
    private final String seasonName;
    private final String seasonDesc;
    
    //此處的屬性戳鹅，只有g(shù)et方法均驶，沒有set方法
     public String getSeasonName() {
         return seasonName;
     }
     public String getSeasonDesc() {
         return seasonDesc;
     }   
    
    private SeasonEnum(String aName, String aDesc){
        this.seasonName = aName;
        this.seasonDesc = aDesc;
    }

2. values()

//返回的是對(duì)應(yīng)枚舉類型的一個(gè)數(shù)組
        SeasonEnum[] seasons = SeasonEnum.values();
        for (int i = 0; i < seasons.length; i++) {
            System.out.println(seasons[i]);
        }

3. valueOf(String name)

        //valueOf傳入一個(gè)形參,該形參的名稱是枚舉類內(nèi)部對(duì)象實(shí)例的名稱
        //否則報(bào)java.IllegalArgumentException異常
        String str = "WINTER";
        SeasonEnum season = SeasonEnum.valueOf(str);
        System.out.println(season);

1. 類內(nèi)部各個(gè)對(duì)象實(shí)例共享同一套該接口的抽象方法的實(shí)現(xiàn)。

interface info{
    void show();
}
//枚舉類
enum SeasonEnum implements info {
    SPRING("spring","春暖花開"),
    SUMMER("summer", "烈日炎炎"),
    FALL ("autumn", "秋風(fēng)蕭瑟"),
    WINTER("winter","冰天雪地");

    private final String seasonName;
    private final String seasonDesc;

    private SeasonEnum(String aName, String aDesc){
        this.seasonName = aName;
        this.seasonDesc = aDesc;
    }

    public String getSeasonName() {
        return seasonName;
    }
    public String getSeasonDesc() {
        return seasonDesc;
    }

    @Override
    public void show() {
        System.out.println("這是一個(gè)季節(jié)");
    }
}
//這種方式中枫虏，無(wú)論通過(guò)哪個(gè)實(shí)例調(diào)用show方法妇穴，都只會(huì)輸出“這是一個(gè)季節(jié)”。

2. 讓類的每個(gè)對(duì)象實(shí)例隶债，都實(shí)現(xiàn)接口的抽象方法腾它，在通過(guò)對(duì)象實(shí)例調(diào)用被
   重寫的抽象方法的時(shí)候，執(zhí)行的效果不同死讹。

interface info{
    void show();
}
enum SeasonEnum implements info {
    SPRING("spring","春暖花開"){
        @Override
        public void show() {
            System.out.println("春天在哪里");
        }
    },
    SUMMER("summer", "烈日炎炎"){
        @Override
        public void show() {
            System.out.println("夏天在哪里");
        }
    },
    FALL ("autumn", "秋風(fēng)蕭瑟"){
        @Override
        public void show() {
            System.out.println("秋天在哪里");
        }
    },
    WINTER("winter","冰天雪地"){
        @Override
        public void show() {
            System.out.println("冬天在哪里");
        }
    };

    private final String seasonName;
    private final String seasonDesc;

    private SeasonEnum(String aName, String aDesc){
        this.seasonName = aName;
        this.seasonDesc = aDesc;
    }
}