Copy directory in Java

The following code 'll copy the contents of a given source folder to a given destination folder.This method accepts 2 parameters,one for source folder location and another for destination folder location.

1. public static void copyFolder(File srcFolder, File destFolder)  
   throws IOException{
2.  
3.  if(!srcFolder.exists()){
4.     System.out.println("Source folder does not exist!");
5.     System.exit(0);
6.  }
7.      
8. //If folder/directory
9.  if(srcFolder.isDirectory()){  
10.  
11.   //If destination directory doesn't exist, create it
12.   if(!destFolder.exists()){
13.      destFolder.mkdir();
14.   }
15.  
16.   //List all the contents of source directory
17.   String files[] = srcFolder.list();
18.   for (String file : files) {
19.      //construct the srcFolder and destFolder file structure
20.      File srcFile = new File(srcFolder, file);
21.      File destFile = new File(destFolder, file);
22.  
23.      //recursive copy
24.      copyFolder(srcFile,destFile);
25.   }
26.  }
27.  
28.  //If file, then copy it
29.  else{
30.  
31.  //Use bytes stream to support all file types
32.   InputStream in = new FileInputStream(srcFolder);
33.   OutputStream out = new FileOutputStream(destFolder);
34.      byte[] buffer = new byte[1024];
35.      int length;
36.      
37.      //copy the file content in bytes
38.      while ((length = in.read(buffer)) > 0){
39.      out.write(buffer, 0, length);
40.      }
41.      in.close();
42.      out.close();
43.  }
44. }