Reading files and directory from a directory

Question

ublic static void readFromDirectory(String dirName) {
          // stop word ArrayLists
          ArabicStop();
          EnglishStop();
          FrenchStop();
          SpanishStop();
          DutchStop();
          File dir = new File(dirName);
          if (dir.isDirectory()) {
               String[] child = dir.list();
               System.out.println("hi Iam here");
               for (int i = 0; i < child.length; i++) {
                    readFromDirectory(child.toString());
          File[] files = dir.listFiles();
          if (files == null) {
               System.out.println("There are no files in this Directory ");
          } else {
               for (int j = 0; j < files.length; j++) {
                    String filename = files[j].toString();
                    readFile(filename);
               if (dirName.equalsIgnoreCase("English")
                         || dirName.equalsIgnoreCase("Nonenglish")) {
                    for (int i = 0; i < a2.size(); i++) {
                         keyWord = a2.get(i).toString();
                         //System.out.println("===" + keyWord + "===" + "KeyWord");
                         for (int a = 0; a < text.size(); a++) {
                              String t1 = text.get(a).toString();
                              if (keyWord.equalsIgnoreCase(t1)) {
                                   count++;
                                   //System.out.println("Found at:" + files[j] + " file");
                         keyWCount = count;
                         m1.put(keyWord, keyWCount);
                         //System.out.println(m1.get(keyWord));
                         count = 0;
               } else if (dirName.equalsIgnoreCase("Spanish")) {
                    for (int i = 0; i < a5.size(); i++) {
                         keyWord = a5.get(i).toString();
                         //System.out.println("===" + keyWord + "===" + "KeyWord");
                         for (int a = 0; a < text.size(); a++) {
                              String t1 = text.get(a).toString();
                              if (keyWord.equalsIgnoreCase(t1)) {
                                   count++;
                                   //System.out.println("Found at:" + files[j] + " file");
                         keyWCount = count;
                         m1.put(keyWord, keyWCount);
                         //System.out.println(m1.get(keyWord));
                         count = 0;
                    //System.out.println(m1);
               } else if (dirName.equalsIgnoreCase("French")) {
                    for (int i = 0; i < a3.size(); i++) {
                         keyWord = a3.get(i).toString();
                         //System.out.println("===" + keyWord + "===" + "KeyWord");
                         for (int a = 0; a < text.size(); a++) {
                              String t1 = text.get(a).toString();
                              if (keyWord.equalsIgnoreCase(t1)) {
                                   count++;
                                   //System.out.println("Found at:" + files[j] + " file");
                         keyWCount = count;
                         m1.put(keyWord, keyWCount);
                         //System.out.println(m1.get(keyWord));
                         count = 0;
     public static void main(String[] args) {
          int countText = 0;
          int c;
          test t1 = new test();
          System.out.println("IN NON - ENGLISH DOCUMENTS - P :");
          t1.readFromDirectory("NonEnglish");
          for (int j = 0; j < text.size(); j++) {
               if (!text.get(j).toString().equalsIgnoreCase("")) {
                    countText++;
          c = countText;
          //System.out.println(c);
          //System.out.println(text.size());
          for (int i = 0; i < a2.size(); i++) {
               String word = a2.get(i).toString();
               String m = (m1.get(word)).toString();
               double x = Double.parseDouble(m);
               System.out.println(word + ":" + (x / c) * 100 + " %");
I wanna read text files from directory that contain - lots of other directorys... and by using this code I have error,,,
Can anyone help me plzzz
Edited by: Shamma on Oct 9, 2008 3:32 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Answer 1

You actually have more than 1 problem: you cannot traverse directories recursively and you get a NullPointerException.
For the first problem you might want to verify what this statement returns:
child.toString() (I honestly don't understand why you are calling toString() on a String object, but that's not the real problem!)
You probably expect it to be a full absolute path.
The NullPointerException has already been pointed out by masijade.