枚举类（三）：枚举类中几个常用的方法

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枚举类中的几个常见方法

int compareTo(E o)

String name()

int ordinal()

String toString()

<T> T valueOf(Class<T> type,String name)

values()

此方法虽然在JDK文档中查找不到，但每个枚举类都具有该方法，它遍历枚举类的所有枚举值非常方便

例子：

public classEnumMethodDemo {   public static void main(String[] args) {      // int compareTo(E o)      Direction2d21 = Direction2.FRONT;      Direction2d22 = Direction2.BEHIND;      Direction2d23 = Direction2.LEFT;      Direction2d24 = Direction2.RIGHT;      System.out.println(d21.compareTo(d21));      System.out.println(d21.compareTo(d24));      System.out.println(d24.compareTo(d21));      System.out.println("---------------");      // String name()      System.out.println(d21.name());      System.out.println(d22.name());      System.out.println(d23.name());      System.out.println(d24.name());      System.out.println("--------------");      // int ordinal()      System.out.println(d21.ordinal());      System.out.println(d22.ordinal());      System.out.println(d23.ordinal());      System.out.println(d24.ordinal());      System.out.println("--------------");      // String toString()      System.out.println(d21.toString());      System.out.println(d22.toString());      System.out.println(d23.toString());      System.out.println(d24.toString());      System.out.println("--------------");      // <T> T valueOf(Class<T> type,String name)      Direction2d = Enum.valueOf(Direction2.class,"FRONT");      System.out.println(d.getName());      System.out.println("----------------");      // values()      // 此方法虽然在JDK文档中查找不到，但每个枚举类都具有该方法，它遍历枚举类的所有枚举值非常方便      Direction2[]dirs = Direction2.values();      for (Direction2 d2 : dirs){         System.out.println(d2);         System.out.println(d2.getName());      }   }}运行结果：0-33---------------FRONTBEHINDLEFTRIGHT--------------0123--------------FRONTBEHINDLEFTRIGHT--------------前----------------FRONT前BEHIND后LEFT左RIGHT右

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