[英]java Reading list of list of files
Can someone help me with reading a list of list of csv files. 有人可以帮助我阅读csv文件列表列表吗? Like 喜欢
List<List<File>> filesList;
Want to read through all the files contents in each list for processing, but unable to comeup with loop structure which can be used. 想通读每个列表中的所有文件内容以进行处理,但是无法使用可以使用的循环结构。 Thanks. 谢谢。
UPDATE: I want to load files from each inner file list simultaneously. 更新:我想同时从每个内部文件列表中加载文件。 Like read first file from each inner list at a time, compare contents, then move to second file of a particular list and so on. 就像一次从每个内部列表中读取第一个文件,比较内容,然后移至特定列表的第二个文件,依此类推。 Each inner list can be of variable size. 每个内部列表可以具有可变大小。
Here's an appropriate loop for this: 这是一个合适的循环:
for (List<File> innerList : filesList)
for (File file : innerList)
// do something for a file
Alternatively you can use Iterator
,like this 另外,您也可以像这样使用Iterator
List<ArrayList<File>> filesList = new ArrayList<ArrayList<File>>();
//add objects to filesList here
Iterator<ArrayList<File>> filesListIterator = filesList.iterator();
while(filesListIterator.hasNext())
{
ArrayList<File> files = filesListIterator.next();
Iterator<File> filesIterator = files.iterator();
while(filesIterator.hasNext())
{
File file = filesIterator.next();
//do your own logic here;
}
}
Update 更新
This may help you for compare 这可以帮助您进行比较
while(filesListIterator.hasNext())
{
ArrayList<File> files = filesListIterator.next();
for(int i=0;i<files.size()-1;i++)
{
File firstFile = files.get(i);//get a file
File secondFile = files.get(i+1);//get the next file
compareFiles(firstFile,secondFile);//this is your defined
//method for compare
}
}
List<List<File>> filesList;
for (List<File> list : filesList) {
for (File file : list) {
// your code here ...
}
}
Personally I would recommend using Google Guava if you can, this has a concat
method 如果可以的话,我个人建议使用Google Guava,这是一种concat
方法
final List<List<File>> files = Lists.newArrayList();
for (final File file : Iterables.concat(files)) {
//doStuff with file
}
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