java - 在添加到集合之前筛选对象的最干净方法？

  private List<BusinessObject> createList(int property1, List<String> filenames) {
    List<BusinessObject> objectList = new ArrayList();
    filenames.forEach(filename -> {
        BusinessObject businessObj = parseObject(filename);
        if (businessObj.getProperty1() == property1) {
            objectList.add(businessObj);
        }
    });
    return objectList;
  }

我觉得那里一定有一个更加惯用的或Java 8式的解决方案，例如

filesnames.forEach(fileName -> parseObject(fileName)).(some method that takes the output of parseObject)

最佳答案

确切的流等效项为：

return filenames.stream()
         .map(filename -> parseObject(filename))
         .filter(o -> o.getProperty1() == property1)
         .collect(Collectors.toCollection(ArrayList::new));