MyDownloaderApp.java

//Import statements go here..

public class MyDownloaderApp {


  //Lots of JavaFX GUI is supposed to go here...
  //Tableview with title column and progressbar column
  //I need to update the progress bar as download progresses

  class DownloaderThread extends Thread {
    private DBWrapper db;
    //constructor provides DBWrapper db
    @Override
    public void run() {
      while(!isInterrupted()&db.hasUncompletedDownload()) {
        DownloadEntry dl = db.getNextIncompleteDownload();
    // Open connection, open file, write, etc.
    // dl.setProgress(int percent) --- Sets the progress of download in percentage during the read write loop
      // Here's where I need help
      // I decided to decouple DownloaderThread from the UI
      // Is this a good or bad decision?
      // If this is a good decision,
        // is there any better way to update UI than using a background thread like below?
        // please look at initUpdateThread()
      }
    }

  }
  public void initUpdateThread(final DBWrapper db) {
    new Thread(){
    @Override
    public void run(){
      while(true){
    Thread.sleep(someInterval);
    List<DownloadEntry> downloads = db.getAllDownloads();
    setTableViewItems(downloads);
      }
     }
    }.start();
  }

  public void setTableViewItems(List<DownloadEntry> dls) {
     //UI Update stuff..
  }
 }