code: private boolean isImplConditHandlerClass(Class<?> implCls) {
          Class<?>[] classes = implCls.getInterfaces();
          if (classes == null) {
              return false;
          }
  
          // 循环判断其接口是否含有'IConditHandler'接口.
          for (Class<?> cls: classes) {
              if (IConditHandler.class.isAssignableFrom(cls)) {
                  return true;
              }
          }
          return false;
      }
docs: 判断给定的class所对应的类是否是IConditHandler类的实现类.
  <p>由于通过'isAssignableFrom()'判断'实现'关系时是false，所以这里采用获取'getInterfaces()'方法来判断.</p>
  
  @param implCls 待判断的class
  @return 布尔值