UNICODE letter(combination) frequency counter

/*Author Shaha Hassan
 *date 16/11/2014
 * GNU License, feel free to do whatever with the code, as long as you give me Shaha Hassan the credit for the code.
 *
 * This program was written to count the occurances of UNICODE letters, or their combinations(2 and 3 char long).
 * It can be used to find what letter occurs the most in a language, or what combinations of letters occur the most.
 * A user can input what UNICODE characters are he wants to focus on in a file and the text to be analysed in another.
 * The program then reads the text file, counts the number of occurences of combinations of consecutive required unicode characters
 * and lists them in descending order.
 */

/*
 * this project is in java and has 4 files
 * Driver
 * Matrix
 * Map
 * Documentation
 * this one is Driver.java (search though my pastes to find the other files.
 */


import java.io.*;
import java.util.Scanner;

public class Driver {
    public static void main(String args[]) throws IOException {
        Reader s = null;
        Writer[] files=null;
        String fin = null;
        Scanner scn = new Scanner(System.in);

        //delete commented stmts if you'd like a prompt which asks you to input custom file names or press '.' for default
        //believe me that becomes tedious after running the program a few times.
        //anyway, opens files
        try {
//          System.out.println("Enter input filename or . ");
//          fin = scn.next();
//          if(fin.equals("."))
                fin = "D:\\in.txt";
//          else fin = fin + ".txt";
            s = new InputStreamReader(new FileInputStream(fin),"UTF-8");

//          System.out.println("Enter output filename or . ");
            fin=".";
//          fin = scn.next();
            if(fin.equals(".")) fin = "D:\\out";

            files = new Writer[3];
            for(int i=1; i<4; i++ ) {
                files[i-1] = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fin+i+".txt"),"UTF-8"));
            }
        } catch (UnsupportedEncodingException e) {
            System.out.print("Coding Format not supported");
        } catch (FileNotFoundException e) {
            System.out.println(fin + "not found.");
        }

        scn.close();

        Map m = new Map();
        Matrix tally = new Matrix(m);
        System.out.println("Map " + m);

        char t1, t2, t3, pre, curr;
        int pos1, pos2, pos3;
        t1=(char)s.read();
        t2 = (char)s.read();
        pre = t2;
        pos1 = m.getpos(t1);
        pos2 = m.getpos(t2);
        if ( (pos1>-1) && (pos2>-1) ) {
            tally.add(pos1, pos2);
            tally.add(pos1);
            tally.add(pos2);
        }
        while(s.ready()) {
            curr=(char)s.read();
            t3 = curr;
            pos1 = m.getpos(t1);
            pos2 = m.getpos(t2);
            pos3 = m.getpos(t3);

            if( pos3>-1) {
                tally.add(pos3);
                if(pos2>-1) {
                    tally.add(pos2, pos3);
                    if(pos1>-1) {
                        tally.add(pos1, pos2, pos3);
                    }
                }
            }
            t1 = pre;
            pre = curr;
            t2 = curr;
        }

        tally.genlist(m);


        tally.write(files);
        for(int i=0; i<3; i++) {
            files[i].close();
        }
        s.close();

        System.out.println("Output saved in following files: D:\\out1.txt, D:\\out2.txt, D:\\out3.txt");
    }

}