public enum Direction extends Enum<Direction> implements Serializable
public static final Direction IN
public static final Direction OUT
public static final Direction BOTH
public static Direction[] values()
for (Direction c : Direction.values()) System.out.println(c);
public static Direction valueOf(String name)
name - 要返回的枚举常量的名称。IllegalArgumentException - 如果该枚举类型没有带有指定名称的常量NullPointerException - 如果参数为空值