Help me!

import javax.swing.text.DefaultStyledDocument;
import javax.swing.text.Document;
import javax.swing.text.rtf.RTFEditorKit;
import java.io.*;

import java.util.Map;
import java.util.Set;
import java.util.TreeMap;



/*
Задача по алгоритмам
*/

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


        final BufferedReader in = new BufferedReader(new InputStreamReader(new FileInputStream(args[0])));
        byte[] buff = new byte [256];
        int a = 0;
        while(in.ready()){
            a = in.read();
            for(int i = 0;i<128;i++){
                if(a==i){
                    buff[i] = (byte) (buff[i]+1);
                }
            }
        }
        for(int i = 0;i<128;i++){
            if(buff[i]!=0) {
                System.out.println((char) i + " " + buff[i]);
            }
        }
        in.close();

    }
}

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