How can i replace BufferedReader readline() by read()

Hello :)
I have this code and it's work fine :

Code:

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try {
            bufferedReader = new BufferedReader(new FileReader(new File(filePath)));
            String currentLine;
            int numLine = 0;
            while ((currentLine = bufferedReader.readLine()) != null) {
                numLine++;
               for (String word : currentLine.split(" ")) {
                    if (!word.isEmpty() ) {
                        mapAllWordsPositionInFilesInFolder.computeIfAbsent(word,v -> new HashMap<>())
                                .computeIfAbsent(filePath,  val -> new HashSet<>())
                                .add(numLine);
                    }
                }
            }
        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            if (bufferedReader != null) {
                bufferedReader.close();
            }
        }

I want change BufferedReader readline() by read() because it's more faster! Someone can help please !