反射获取类初始化字段值

碰到用反射取初始化字段值的问题， 记录一下

public class ActionType {
	public static final String INSERT = "insert";
	public static final String DELETE = "delete";
	public static final String UPDATE = "update";
	public static final String QUERY = "queryPage";

	public static boolean contains(String actionType) {
		Field[] fields = ActionType.class.getDeclaredFields();
		if (fields == null)
			return false;

		try {
			Object obj = ActionType.class.newInstance();
			for (Field f : fields) {
				f.setAccessible(true);
				if (actionType.equals(f.get(obj)))
					return true;
			}
		} catch (Exception e) {
			LogManager.getLogger(ActionType.class).error(e.getMessage());
		}

		return false;
	}
}