code: public static Method getMethod(Object target, String methodName, Class... parameterTypes) {
          try {
              return target.getClass().getMethod(methodName, parameterTypes);
          } catch (NoSuchMethodException e) {
              throw handleException(methodName, e);
          }
      }
docs: Get target method
  
  @param target         target object
  @param methodName     method name
  @param parameterTypes method parameter types
  @return return value