Read a file as string (open(filename).read() in python)

ReadFileAsString.java

public static String readFileAsString(String fileName) throws java.io.IOException {
    java.io.InputStream is = new java.io.FileInputStream(fileName);
    try {
        final int bufsize = 4096;
        int available = is.available();
        byte data[] = new byte[available < bufsize ? bufsize : available];
        int used = 0;
        while (true) {
            if (data.length - used < bufsize) {
                byte newData[] = new byte[data.length << 1];
                System.arraycopy(data, 0, newData, 0, used);
                data = newData;
            }
            int got = is.read(data, used, data.length - used);
            if (got <= 0)
                break;
            used += got;
        }
        return new String(data, 0, used);
    } finally {
        is.close();
    }
}