Getting list of files/subdirectories in a directory

The following code 'll return the list of files that are present in the directory.This function accepts a parameter 'dirName',the directory in which you want the list of files.

1. public String[] filesInDir(String dirName){
2.   String[] files = null;  
3.   try {
4.     File dir = new File(dirName);
5.     if (dir.isDirectory()) {
6.       files = dir.list();
7.     }
8.     else if (!dir.exists()){
9.       System.out.println("Directory doesn't exist");
10.       System.exit(0);
11.    }
12.    } catch (Exception e) {
13.      e.printStackTrace();
14.    }  
15.   return files;
16. }