Shift_JISコード変換について

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

class test3{
    public static void main(String[] args){
        final String encoding = "SJIS";
        
        BufferedReader fin;
        String ss             = "";
        String brain_name     = "";
        String brain_a_name = "";
        try{
            fin = new BufferedReader(new InputStreamReader(new FileInputStream("KY20030903110128.csv"), encoding));
            while ((ss = fin.readLine()) != null){
                StringTokenizer st = new StringTokenizer(ss, ",");
                brain_name         = st.nextToken();
                brain_a_name       = st.nextToken();
                if(brain_a_name.equals("") == false){
                    String a = dump_sjis(brain_a_name);
                    write_error(a);
                }
            }
            fin.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
    private static String dump_sjis(String str){
        StringBuffer sb = new StringBuffer();
        try {
            byte[] sjis = str.getBytes("SJIS");
            sb.append("SJIS(" + str + "): ");
            for(int i=0; i<sjis.length; i++){
                sb.append("0x" + Integer.toHexString(sjis[i] & 0xff) + " ");
            }
        }catch (java.io.UnsupportedEncodingException e) {
            e.printStackTrace();
        }
        return new String(sb);
    }
    private static void write_error(String cd){
        PrintWriter fout = null;
        try {
            fout = new PrintWriter(new BufferedWriter(new FileWriter("SJIS_dump.txt", true)));
            fout.println(cd);
            fout.close();
        } catch (Exception e) {
            e.printStackTrace();
            System.exit(1);
        }
    }
}