kjhgfgihjgfgjkl/j.h,gmj,k

package laba4;

import javax.swing.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.util.LinkedList;
import java.util.List;
import java.util.Queue;
import java.util.concurrent.TimeUnit;

public class Main extends JFrame {

    private JProgressBar progressBar1,progressBar2;

    private JButton start, stop;

    private JProgressBar current;
    private Queue<JProgressBar> queue;
    private Task task;

    public Main() {

        createAndShowGUI();

        queue = new LinkedList<>();
        queue.add(progressBar1);
        queue.add(progressBar2);

    }

    private void createAndShowGUI() {
        JPanel panel = new JPanel();

        progressBar1 = new JProgressBar();
        progressBar1.setValue(0);
        progressBar1.setStringPainted(true);
        progressBar2 = new JProgressBar();
        progressBar2.setValue(0);
        progressBar2.setStringPainted(true);


        start = new JButton("Start");
        start.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                start.setEnabled(false);
                stop.setEnabled(true);
                task = new Task();
                current = queue.poll();
                task.execute();
            }
        });
        stop = new JButton("Stop");
        stop.setEnabled(false);
        stop.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                task.cancel(true);
                current.setValue(0);

                stop.setEnabled(false);
                start.setEnabled(true);

                queue.offer(current);
            }
        });

        panel.add(progressBar1);
        panel.add(progressBar2);

        panel.add(start);
        panel.add(stop);

        setContentPane(panel);
        setSize(100, 100);

        setTitle("Progress bar");
        setLocationRelativeTo(null);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);

    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(new Runnable() {
            @Override
            public void run() {
                Main main = new Main();
                main.setVisible(true);
            }
        });
    }

    class Task extends SwingWorker<Void, Integer> {

        private int counter;

        @Override
        protected Void doInBackground() throws Exception {
            while (counter < 100) {
                if (isCancelled()) {
                    counter = 0;
                    return null;
                }
                try {
                    TimeUnit.MILLISECONDS.sleep(120);
                    counter++;
                    publish(counter);
                } catch (InterruptedException ignored) {}
            }
            return null;
        }

        @Override
        protected void process(List<Integer> chunks) {
            current.setValue(counter);
        }

    }

}