枚举类（三）：枚举类中几个常用的方法
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
-3
3
---------------
FRONT
BEHIND
LEFT
RIGHT
--------------
0
1
2
3
--------------
FRONT
BEHIND
LEFT
RIGHT
--------------
前
----------------
FRONT
前
BEHIND
后
LEFT
左
RIGHT
右