How to read from one file and write into another file?

Question

Hi,
I am trying to read a File and write into another file.This is the code that i am using.But what happens is last line is only getting written..How to resolve this.the code is as follows,
public String get() {
     FileReader fr;
     try {
          fr = new FileReader(f);
          String str;
          BufferedReader br = new BufferedReader(fr);
          try {
               while((str= br.readLine())!=null){
               generate=str;     
          } catch (IOException e1) {
               e1.printStackTrace();
          } }catch (FileNotFoundException e) {
               e.printStackTrace();
     return generate;
where generate is a string declared globally.
how to go about it?
Thanks for your reply in advance

Answer 1

If you want to copy files as fast as possible, without processing them (as the DOS "copy" or the Unix "cp" command), you can try the java.nio.channels package.
import java.nio.*;
import java.nio.channels.*;
import java.io.*;
import java.util.*;
import java.text.*;
class Kopy {
     * @param args [0] = source filename
     *        args [1] = destination filename
    public static void main(String[] args) throws Exception {
        if (args.length != 2) {
            System.err.println ("Syntax: java -cp . Kopy source destination");
            System.exit(1);
        File in = new File(args[0]);
        long fileLength = in.length();
        long t = System.currentTimeMillis();
        FileInputStream fis = new FileInputStream (in);
        FileOutputStream fos = new FileOutputStream (args[1]);
        FileChannel fci = fis.getChannel();
        FileChannel fco = fos.getChannel();
        fco.transferFrom(fci, 0, fileLength);
        fis.close();
        fos.close();
        t = System.currentTimeMillis() - t;
        NumberFormat nf = new DecimalFormat("#,##0.00");
        System.out.print (nf.format(fileLength/1024.0) + "kB copied");
        if (t > 0) {
            System.out.println (" in " + t + "ms: " + nf.format(fileLength / 1.024 / t) + " kB/s");
}