Как правильно читать из inputstream в java?

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InputStream inputStream = new FileInputStream("file.txt");
int data;
while ((data = inputStream.read()) != -1) {
    // обрабатываем байт
}
inputStream.close();

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InputStream inputStream = new FileInputStream("file.txt");
byte[] buffer = new byte[1024];
int bytesRead;
while ((bytesRead = inputStream.read(buffer)) != -1) {
    // обрабатываем буфер
}
inputStream.close();

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InputStream inputStream = new FileInputStream("file.txt");
BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream));
String line;
while ((line = reader.readLine()) != null) {
    // обрабатываем строку
}
reader.close();