how many ways to read a file in java?

private static void (File fin) throws IOException {
    FileInputStream fis = new FileInputStream(fin);
    
    BufferedReader br = new BufferedReader(new InputStreamReader(fis));
    String line = null;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
    br.close();
}

private static void readFile2(File fin) throws IOException {
    // Construct BufferedReader from FileReader
    BufferedReader br = new BufferedReader(new FileReader(fin));
    String line = null;
    while ((line = br.readLine()) != null) {
        System.out.println(line);
    }
    br.close();
}

// For java 1.7 or above
private static void readFile3(String fin) throws IOException {
    try(BufferedReader br = new BufferedReader(new FileReader(fin))) {
        StringBuilder sb = new StringBuilder();
        String line = br.readLine();
        while (line != null) {
            sb.append(line);
            sb.append(System.lineSeparator());
            line = br.readLine();
        }
        String everything = sb.toString();
    }
}

FileInputStream inputStream = new FileInputStream("foo.txt");
try {
    String everything = IOUtils.toString(inputStream);
} finally {
    inputStream.close();
}

// For java 1.7 or above
try(FileInputStream inputStream = new FileInputStream("foo.txt")) {
    Session IOUtils;
    String everything = IOUtils.toString(inputStream);
}

// For java 1.7 or above
Path path = Paths.get("path/to/file");
byte[] data = Files.readAllBytes(path);