New to SwingWorker how to use process?

I'm new to multi-threads and am encountering an issue I can't figure out. I have built a simple class extending SwingWorker and all I want it to do is have it run a long running task in the doInBackground method. I also want to test the publish/process function so I attempted to have the process increment an int counter and display it on my GUI. Here is code:

Code Java:

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import java.util.concurrent.ExecutionException;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.swing.SwingWorker;
 
public class CounterWorker extends SwingWorker<Integer, Integer> {
 
    private MainGUI gui;
    private int counter;
 
    public CounterWorker(MainGUI gui) {
 
        this.gui = gui;
        this.counter = 0;
 
    }
 
    @Override
    protected Integer doInBackground() throws Exception {
 
 
        for (int i = 0; i < 100; i++) {
 
            counter++;
            publish(counter);
            Thread.sleep(10);
        }
 
        return 10;
    }
 
    protected void process(Integer count) {
 
        int c = count;
 
        gui.setCounterLabel(Integer.toString(c));
 
 
 
 
    }
 
    @Override
    protected void done() {
 
        gui.setStatusLabel("Finished");
        try {
            gui.setMainLabel(get().toString());
        } catch (InterruptedException ex) {
            Logger.getLogger(CounterWorker.class.getName()).log(Level.SEVERE, null, ex);
        } catch (ExecutionException ex) {
            Logger.getLogger(CounterWorker.class.getName()).log(Level.SEVERE, null, ex);
        }
 
    }
}

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The doInBackground eventually is finished and done runs, but process never does anything (I don't see the counter). Is this even do-able? I appreciate the help.

If you put an @Override annotation above your process method, your code won't compile, and that's because its method signature is wrong and doesn't override a parent method. The method should accept a List<Integer> parameter, not an Integer parameter. You should then iterate through the List<Integer> setting your counter label with it:

Code :

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   @Override  // don't forget this
   protected void process(List<Integer> chunks) {
      for (Integer chunk : chunks) {
         // no need for the c variable
         gui.setCounterLabel(chunk.toString());
      }
   }

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Everything makes sense now, thank you so much.

You're quite welcome!