虽然循环似乎没有增加

Question

My code basically looks like this:

bufferedReader = new BufferedReader(new InputStreamReader(inputFile));

    while ((currentLine = bufferedReader.readLine()) != null) {

         Document document;
         DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
         DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
         document = dBuilder.parse(new InputSource(new StringReader(currentLine)));
         document.getDocumentElement().normalize();
         NodeList nList = document.getElementsByTagName("record");

         int j = 0;
         int k = 0;
         while (j < lines) {
             if (currentLine.contains(bList.get(k))) {
                 myList.add(currentLine);
                 bufferedReader.mark(0);
                 k++;
                 j++;
             }
             else if (myList.size() == bList.size()) {
                 break;
             }
             else {
                 j++;
             }
         }

I have a bufferedReader which goes through a file line by line. What I want is for a single occurrence of line to be added to myList, based on whether that line contains a string which exists in bList. For whatever reason, when I debug, bList doesn't move to the next index despite the k++ incrementation. I'm also unsure if using bufferedReader.mark(0) is the right move here, I previously used inputFile.getChannel().position(0); but I was met with:

'Error: XML document structures must start and end within the same entity'

Another issue I noticed when debugging is that the while loop doesn't break when the size of myList and bList are equal. Instead, myList makes it all the way to a size of 34 whilst bList remains at a size of 2.

EDIT: Added more lines for a bit of context and understanding

Answer 1

k will never be incremented if currentline does not contain whatever is in bList @ index k and will therefore be stuck at this word.

if currentline contains the thing in bList else if (myList.size() == bList.size()) won't be executed, and you don't want to use break, that is just bad style. Instead go for while(... && myList.size() < bList.size() )

Also I don't understand the logic behind adding the same line to myList several times, you probably want to iterate over other lines.

What is the purpose of bufferedReader.mark(0); ?

Here is some code that should do what you want:

  LinkedList<String> found = new LinkedList<String>();
  while ((currentLine = bufferedReader.readLine()) != null) {
    foreach(String word : bList){
      if(!found.contains(word) && currentline.contains(word)){
        myList.add(currentLine);
        found.add(word);
        break;      
      }
    }
  }

this adds every line to myList the first time it contains a word from bList. alternatively you can delete the word from bList if you don't need bList anymore.