IDEA告警详解：Optional.isPresent can be replaced with functional-style expression

类似 if(Optional.isPresent()) 的条件语句，可以被重写成函数式风格。

if (!response.isPresent()) {
    return Result.success(null);

} else {
    return Result.success(response.get());
}

response.map(Result::success)
  .orElseGet(() -> Result.success(null));