String v1 = "0110";
String v2 = "0111";
File FolderA, FolderB;

void setup(){
 size(200, 200);
 FolderA = new File("c:\\Program Files\\processing-"+v1+"-expert");
 FolderB = new File("c:\\Program Files\\processing-"+v2+"-expert");
 stepThrough(new File(FolderA.getAbsolutePath()+"\\libraries"),new File(FolderB.getAbsolutePath()+"\\libraries"));
 if(!compareFiles(new File(FolderA.getAbsolutePath()+"\\lib\\loading.gif"),new File(FolderB.getAbsolutePath()+"\\lib\\loading.gif"))) Copy(FolderA.getAbsolutePath()+"\\lib\\loading.gif",FolderB.getAbsolutePath()+"\\lib\\loading.gif");
 noLoop();
}

boolean compareFiles(File A, File B){
 if(A.isDirectory() || B.isDirectory()) return false;
 try{
   FileInputStream inA = new FileInputStream(A);
   FileInputStream inB = new FileInputStream(B);
   if(inA.available() == inB.available()) return true;
   inA.close();
   inB.close();
 }catch(Exception e){
   println(e);
 }
 return false;  
}

void stepThrough(File A, File B)
{
 if(!A.isDirectory() || !B.isDirectory()) return;
 String[] missing = compareFolders(A,B);
 for(int i = 0; i < missing.length; i++){
   File source = new File(A.getAbsolutePath()+"\\"+missing[i]);
   File dest = new File(B.getAbsolutePath()+"\\"+missing[i]);
   if(source.isDirectory()){
     if(dest.mkdir()){
       stepThrough(source,dest);
     }
   }else{
     Copy(source.getAbsolutePath(),dest.getAbsolutePath());
   }
 }
}

String[] getFolder(File f)
{
 if(!f.isDirectory()) return null;
 return f.list();
}

String[] compareFolders(File src, File dest)
{
 if(!src.isDirectory() || !dest.isDirectory()) return null;
 String[] sSrc = getFolder(src);
 String[] sDest = getFolder(dest);
 String[] ret = new String[0];
 for(int i = 0; i < sSrc.length; i++){
   boolean exists = false;
   for(int j = 0; j < sDest.length; j++){
     if(sSrc[i].equals(sDest[j])) exists = true;
   }
   if(!exists) ret = append(ret,sSrc[i]);
 }
 return ret;
}

void Copy(String source, String dest){
 File inputFile = new File(source);
 File outputFile = new File(dest);

 try{
   FileInputStream in = new FileInputStream(inputFile);
   FileOutputStream out = new FileOutputStream(outputFile);
   int len;
   byte[] buf = new byte[1024];
   while ((len = in.read(buf)) > 0)
     out.write(buf,0,len);

   in.close();
   out.close();
   println("Copied");
 }catch (Exception e){
   println("Not Copied");
 }
}