Stopping a thread from "cancel" button

Question

Hello all,
I have a problem trying to stop a thread. I have a class that hits database and retrieves lots of data. This retrieval can take a long time if lots of data, so I have a progress bar displayed. This progress bar has a cancel button. I am not sure how to link the cancel button to the thread so the thread can exit. See code below for example of whats going on:
public class MainApp {
  public void doWork() {
    ProgressBar pbar = new ProgressBar();
    pbar.show();
    DatabaseThread dbThread = new DatabaseThread();
    dbThread.run();
public class ProgressBar {
  // displays a progress bar with cancel button
public class DatabaseThread extends Thread {
  public void run() {
    // hit database
}So how am I to cancel the DatabaseThread class from the ProgressBar class. Thanks for all suggestions!

Answer 1

what i said is that you need to hava a reference to your thread ine the class that handle the progressBar.
and in your Thread class you create a method like setCanceled(boolean b)...
public MyThread extends Thread{
   private boolean canceled = false;
   public void setCanceled(boolean b){
      canceled = b;
   public void run(){
      while(!canceled){
        //do your stuff