File and bubble sort problem

Question

hey, I'm in a bit of a pickle.
I'm trying to read from a file then bubble sort the file then write that to another file. Any suggestions how I can go about this. I've managed to read from the file, but have no idea how to bubble sort it.
Any useful suggestions would be appreaciated

Answer 1

Find the code below to read the numbers from nonsorted.txt frile in d: Drive and outputs the sorted into sorted.txt
import java.io.DataInputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.PrintStream;
import java.util.ArrayList;
import java.util.StringTokenizer;
public class BubbleSort {
     static StringBuffer newFile;
     static String FileNamewithpath = "d:/nonsorted.txt";
     static String NewFileNamewithpath = "d:/sorted.txt";
     static ArrayList numberList;
      * @param args
          public static void main(String args[]) {
               newFile = new StringBuffer();
               numberList = new ArrayList<Integer>();
               try {
                    FileInputStream fstream = new FileInputStream(FileNamewithpath);
                    DataInputStream in = new DataInputStream(fstream);
                    StringBuffer sb = new StringBuffer();
                    // there are still some left to read
                    while (in.available() != 0) {
                         getNumbers(in.readLine());
                    in.close();
                    System.out.println(numberList);
                    numberList =  bubbleSortElements(numberList);
                    for (int i =0; i< numberList.size(); i++) {
                         newFile.append(Integer.parseInt(""+numberList.get(i)) + " ");
                    FileOut();
               } catch (Exception e) {
                    e.printStackTrace();
                    System.err.println("File input error");
          public static void getNumbers(String str) {
               StringTokenizer st = new StringTokenizer(str);
               int i =0;
               while (st.hasMoreTokens()) {
                    String word = st.nextToken();
                    numberList.add(word);
                    i++;
               //return null;
          public static void FileOut() {
               FileOutputStream out; // declare a file output object
               PrintStream p; // declare a print stream object
               try {
                    out = new FileOutputStream(NewFileNamewithpath);
                    p = new PrintStream(out);
                    p.println(newFile);
                    p.close();
               } catch (Exception e) {
                    System.err.println("Error writing to file");
     public static  ArrayList bubbleSortElements(ArrayList numList ){
     try {
          int tmp;
          for (int i=0; i<numList.size()-1; i++) {
                 for (int j=0; j<numList.size()-1-i; j++)
                   if (Integer.parseInt(""+numList.get(j+1)) < Integer.parseInt(""+numList.get(j))) {  /* compare the two neighbors */
                     tmp = Integer.parseInt(""+numList.get(j));         /* swap a[j] and a[j+1]      */
                     numList.set(j,numList.get(j+1));
                     numList.set(j+1,tmp);
     } catch(Exception e) {
          e.printStackTrace();
          return numList;
}