i am writing a simple program that read a text file from one directory and writes an new one in cvs format in another one. I am running into a problem on how to correctly format it . for now this is what i have can someone help me.. thank you :)

first class:

package elite.tech.com;

/*this program reads files from inpath and writes them to outpath as a single txt file*/

import java.io.*;

public class ConcatenatedFiles {

static public void main(String arg[]) throws IOException  {

    System.out.println("about to read");
    threadrunner thr1, thr2;
    System.out.println("thread 1 startin");
    thr1 = new threadrunner();
    System.out.println("thread 2 startin");
    thr2 = new threadrunner();
    thr1.reba();

    //thr2.reba();
    //run();
}


//this class converts the text file into binary
static void convert(String to_convert){

    File file=new File(to_convert);
    boolean exists = file.exists();
    if (!exists) {
        // It returns false if File or directory does not exist
        System.out.println("the file or directory you are searching does not exist : " + exists);

    }else{
        // It returns true if File or directory exists
        System.out.println("Status: "+to_convert+ " has been created .");
    }

}

}

second class: package elite.tech.com;

import java.io.BufferedReader; import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.FileReader; import java.io.IOException; import java.io.PrintWriter; import java.util.Random;

public class threadrunner extends Thread{

/*the following are my inpath  which is the dir to the files to be read and the outpath which is the
dir for the out put text.*/

private int a;
static String inpath = "C:\\Users\\ndayala\\asc";
static String outpath = "C:\\Users\\ndayala\\bin\\bin.txt";

public threadrunner() { }

// public void start() { // for (int i = 1; i <= a; ++i){ // // System.out.println(getName() + " is " + i); // try{ // sleep(1000); // } // catch(InterruptedException e){} // } // }

public void reba() throws IOException{
    Random rn = new Random();   
    PrintWriter pw = new PrintWriter(new FileOutputStream(outpath ));// write to the outpath dir

    File file = new File(inpath);//files from the inpath
    File[] files = file.listFiles();//listFiles all file in inpath dir

    int rndom = rn.nextInt(files.length);
    for (int i = 0; i < files.length; i++) {
        System.out.println("Processing " + files[i].getPath() + "... ");
        BufferedReader br = new BufferedReader(new FileReader(files[i].getPath()));
        String line = br.readLine();

        while (line != null) {
            line = line.replace(" ","" ); 
            line = line.replace("mSOriginatingSMSinMSC","" );  
            line = line.replace("GSMPLMNCallDataRecord","" ); 
            line = line.replace("tAC","" ); 

            System.out.println("found it~~~~~~~~~~~~~~~~"+files[i]);
            char com =',';
            pw.print(com+line);
            line = br.readLine();
        }
        br.close();
    }
    pw.close();
    System.out.println("your file have been concatenaded into one file under directory "+outpath);
    //convert(outpath);
}

}