private void readFilmData(String fileName) throws IOException //1
{
	File filmFile = new File(filename); //2
	Scanner scanner1 = new Scanner( filmFile ); //3
	while (scanner1.hasNext() ) //4 could throw a FileNotFoundExcpetion
	{
		String line = scanner1.nextLine(); //5
		Scanner scanner2 = new Scanner(line);
		scanner2.useDelimiter("[ ]*(,)[ ]*");
		String filmTitle = scanner2.next();
		String filmRating = scanner2.next();
		int short = scanner2.nextInt();
		// other code here to read & store rest of data
		scanner2.close();
	}
	scanner1.close();
}

Citizen ->
	English -> 
		Mancunian, 
		Londoner
	Scots
	
Citizen person1;
English person2;
Scots person3;
Mancunian person4;
Londoner person5;

person1 = new Londoner();
person1 type Citizen. Legal

person2 = new Mancunian();
person2 type English. Legal

person5 = new English();
person5 type Londoner. Illegal

persona2 = new Scots();
person2 type English. Illegal

factorial(3) ->
	x = 2
	y = factorial(2)
		factorial(2) ->
			x = 1
			y = factorial(1) -> 1
			n*y = 2*1 = 2
	n*y = 2*3 = 6 
		
		
		
public int countTree(BinTreeNode t)
{
      int count;
      if (t == null)
         count = 0;
      else
         count = countTree(t.leftChild) + 1 + countTree(t.rightChild);
      return count;
}