1. 枚举类的说明：

  1. 枚举类的理解：类的对象只有有限个，确定的。我们称此为枚举类
  2. 当需要定义一组常量时，强烈建议使用枚举类

  3. 如果枚举类中只有一个对象，则可以作为单例模式的实现方式

    2. 如何自定义枚举类？步骤：

    1. //自定义枚举类
    2. class Season{
    3.  //1.声明Season对象的属性的属性：private final修饰
    4.  private  final String seasonName;
    5.  private  final String seasonDesc;
    7.  //2.私有化类的构造器，并给对象属性赋值
    8.  private Season(String seasonName,String seasonDesc){
    9.      this.seasonName=seasonName;
    10.      this.seasonDesc=seasonDesc;
    11.  }
    13.  //3.提供当前枚举类的多个对象：public static final的
    14.  public static final Season SPRING=new Season("春天","春暖花开");
    15.  public static final Season SUMMER=new Season("夏天","夏日炎炎");
    16.  public static final Season AUTUMN=new Season("秋天","秋高气爽");
    17.  public static final Season WINTER=new Season("冬天","冰天动地");
    19.  //4.其他诉求：获取枚举类对象的属性
    20.  public String getSeasonName() {
    21.      return seasonName;
    22.  }
    24.  public String getSeasonDesc() {
    25.      return seasonDesc;
    26.  }
    28.  //5.其他诉求：提供toString()
    29.  @Override
    30.  public String toString() {
    31.      return "Season{" +
    32.              "seasonName='" + seasonName + '\'' +
    33.              ", seasonDesc='" + seasonDesc + '\'' +
    34.              '}';
    35.  }
    36. }

    3. jdk 5.0 新增使用enum定义枚举类。步骤：

    ```java //使用enum关键字枚举类 enum Season1 implements Info{ //1.提供当前枚举类的多个对象：public static final的 SPRING(“春天”,”春暖花开”), SUMMER(“夏天”,”夏日炎炎”), AUTUMN(“秋天”,”秋高气爽”), WINTER(“冬天”,”冰天动地”);

    //2.声明Season对象的属性的属性：private final修饰 private final String seasonName; private final String seasonDesc;

  1. //3.私有化类的构造器，并给对象属性赋值
  2. private Season1(String seasonName,String seasonDesc){
  3.     this.seasonName=seasonName;
  4.     this.seasonDesc=seasonDesc;
  5. }
  7. //4.其他诉求：获取枚举类对象的属性
  8. public String getSeasonName() {
  9.     return seasonName;
  10. }
  12. public String getSeasonDesc() {
  13.     return seasonDesc;
  14. }
  16. //5.其他诉求：提供toString()
  17. @Override
  18. public String toString() {
  19.     return "Season{" +
  20.             "seasonName='" + seasonName + '\'' +
  21.             ", seasonDesc='" + seasonDesc + '\'' +
  22.             '}';
  23. }

// @Override // public void show(){ // System.out.println(“季节”); // } }

<a name="x7lyg"></a>
# 4. 使用enum定义枚举类之后，枚举类常用方法：（继承于java.lang.Enum类）
```java
public class SeasonTest1 {
    public static void main(String[] args) {
        Season1 season1=Season1.SPRING;

        //toString();返回当前枚举类对象常量的名称
        System.out.println(season1);

        //System.out.println(Season1.class.getSuperclass());

        //values():返回枚举类型的对象数组。该方法可以很方便地遍历所有的枚举值。
        Season1[] values=Season1.values();
        for (int i = 0; i < values.length; i++) {
            System.out.println(values[i]);
            values[i].show();
        }

        System.out.println("****************");

        Thread.State[] values1 = Thread.State.values();
        for (int i = 0; i <values1.length ; i++) {
            System.out.println(values1[i]);
        }

        //valueOf(String objName):返回枚举类中对象名是objName的对象，
        //如果没有objName的枚举类对象，则抛异常：IllegalArgumentException
        Season1 winter = Season1.valueOf("SPRING");
        System.out.println(winter);

    }
}

5. 使用enum定义枚举类之后，如何让枚举类对象分别实现接口：

interface Info{
    void show();
}
//使用enum关键字枚举类
enum Season1 implements Info{
    //1.提供当前枚举类的多个对象：public static final的
    SPRING("春天","春暖花开"){
        @Override
        public void show() {
            System.out.println("这是春天");
        }
    },
    SUMMER("夏天","夏日炎炎") {
        @Override
        public void show() {
            System.out.println("这是夏天");
        }
    },
    AUTUMN("秋天","秋高气爽") {
        @Override
        public void show() {
            System.out.println("这是秋天");
        }
    },
    WINTER("冬天","冰天动地") {
        @Override
        public void show() {
            System.out.println("这是冬天");
        }
    };

    //2.声明Season对象的属性的属性：private final修饰
    private  final String seasonName;
    private  final String seasonDesc;


    //3.私有化类的构造器，并给对象属性赋值
    private Season1(String seasonName,String seasonDesc){
        this.seasonName=seasonName;
        this.seasonDesc=seasonDesc;
    }

    //4.其他诉求：获取枚举类对象的属性
    public String getSeasonName() {
        return seasonName;
    }

    public String getSeasonDesc() {
        return seasonDesc;
    }

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

//    @Override
//    public void show(){
//        System.out.println("季节");
//    }
}