ReadVeryBigFile.java

public class ReadVeryBigFile {

    public static void main(String[] args) throws Exception {

        Runtime runtime = Runtime.getRuntime();

        NumberFormat format = NumberFormat.getInstance();

        long startedMemory = runtime.freeMemory();

        String filename = "verybigfile.txt";

        FileInputStream inputStream = null;
        Scanner sc = null;
        try {
            inputStream = new FileInputStream(new File(filename));
            sc = new Scanner(inputStream, "UTF-8");
            while (sc.hasNextLine()) {
                String line = sc.nextLine();
                System.out.println(line);
            }
            // note that Scanner suppresses exceptions
            if (sc.ioException() != null) {
                throw sc.ioException();
            }
        }
        finally {
            if (inputStream != null) {
                inputStream.close();
            }
            if (sc != null) {
                sc.close();
            }
        }

        System.out.println("free memory before: " + format.format(startedMemory / 1024) + "\n");
        System.out.println("free memory after: " + format.format(runtime.freeMemory() / 1024) + "\n");
    }
}