code: public static void init() {
          try {
              String packageName = Logs.class.getPackage().getName() + ".impl.";
              adapter = new SimplePluginManager<LogAdapter>(
                      packageName + "CustomLogAdapter",
                      packageName + "Slf4jLogAdapter",
                      packageName + "Log4jLogAdapter",
                      packageName + "SystemLogAdapter").get();
          }
          catch (Throwable e) {
              try {
                  Log4jLogAdapter tmp = new Log4jLogAdapter();
                  if (tmp.canWork())
                      adapter = tmp;
                  else
                      adapter = new SystemLogAdapter();
              } catch (Throwable _e) {
                  adapter = new SystemLogAdapter();
              }
          }
      }
docs: 初始化NutLog,检查全部Log的可用性,选择可用的Log适配器
  <p/>
  <b>加载本类时,该方法已经在静态构造函数中调用,用户无需主动调用.</b>
  <p/>
  <b>除非迫不得已,请不要调用本方法<b/>
  <p/>