枚舉

package meiju;
public class yunxing {

    public static void main(String[] args)

    {
        System.out.print(Weekday.A);
    }
}

/*class Weekday

{

   public static final Weekday A=new Weekday();

   public static final Weekday B=new Weekday();

   public static final Weekday C=new Weekday();

   public static final Weekday D=new Weekday();

   public static final Weekday E=new Weekday();

   public static final Weekday F=new Weekday();

   public static final Weekday G=new Weekday();

}*/ 

enum Weekday {  A,B,C,D,E; }   //和上面構造的Weekday類功能相同

 

***************************************************************************************

如何定義枚舉的構造函數、方法和字段去封裝更多的信息

package meiju;

public class yunxing {
    public static void main(String[] args)
    {
        dayin(Weekday.A);
    }
    public static void dayin(Weekday g)//封裝打印函數
    {
        String value=g.getWeekday();
        System.out.print(value);
    }

}
//如何定義枚舉的構造函數、方法和字段去封裝更多的信息
enum Weekday
{
    A("MOD"),B("TUE");
    private String value;
    private Weekday(String value)  //構造函數，必須私有化！由於若是是公有，即可以構造出除了枚舉以外的對象
    {
        this.value=value;
    }
    public String getWeekday()  //獲取，由於這個函數在主函數中還要調用，因此必須是public！！
    {
        return this.value;
    }
}

&&&&&&&&&&&&&&&&&&&&&上下兩個程序相比較

package meiju;
class yunxing
{
   public static void main(String[] args)
   {
       System.out.print(Weekday.C);
   }
}
class Weekday
{
    static String A = "MOD";
    static String B = "TUE";
    static String C = "WEN";
}

 

 **********************************************************************************************************

帶抽樣方法的枚舉

package meiju;

public class yunxing {
    public static void main(String[] args)
    {
        dayin(Weekday.B);
    }
    public static void dayin(Weekday g)//封裝打印函數
    {
        String value=g.Chinese();
        System.out.print(value);
    }

}
//帶抽樣方法的枚舉
enum Weekday
{
    A("MOD")
    {
        public  String Chinese()//實現下面定義的抽樣方法
        {
            return "星期一";
        }
    }
    ,B("TUE")
    {
        public  String Chinese()
        {
            return "星期二";
        }
    };
    private String value;
    private Weekday(String value)  //把MOD付給A
    {
        this.value=value;
    }
    public String getWeekday()  //獲取
    {
        return this.value;
    }
    public abstract String Chinese();//定義抽樣方法，定義了以後在枚舉的對象裏必須實現抽樣方法，要不會報錯。
   
}

 *******************************************************************************************

本身寫個小例子增強理解

package meiju;

public class yunxing
{
    public static void main(String[] args)
    {
        dayin(jieshao.C);
        dayin1(jieshao.C);
    }
    public static void dayin(jieshao a)
    {
        String name=a.getname();
        System.out.println(name);
    }
    public static void dayin1(jieshao a)
    {
        String nianling=a.getage();
        System.out.println("我今年"+nianling+"歲了");
    }
}
enum jieshao
{
   A("12")
   {
       public String getname()
       {
           return "我叫張三";
       }
   },
   B("13")
   {
       public String getname()
       {
           return "我叫李四";
       }
   },
   C("14")
   {
       public String getname()
       {
           return "我叫王五";
       }
   },
   D("17")
     {
       public String getname()
       {
           return "我叫趙六";
       }
   };
   private String age;
   private jieshao(String age)
   {
       this.age=age;
   }
   public String getage()
   {
       return this.age;
   }
   public abstract String getname();
}