枚举类的常用方法

public class EnumMethodDemo {
    public static void main(String[] args) {
        // int compareTo(E o)

        Direction2 d21 = Direction2.FRONT;
        Direction2 d22 = Direction2.BEHIND;
        Direction2 d23 = Direction2.LEFT;
        Direction2 d24 = 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 valueOf(Class type,String name)

        Direction2 d = 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());
        }
    }
}