[solved]swing applet thread GUI 얼지 않는 spin 최신버전?

import java.awt.BorderLayout;
import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JProgressBar;
import javax.swing.Timer;
import javax.swing.border.Border;
 
public class Main {
    int val;
 
    public Main() {
        JFrame f = new JFrame("JProgressBar Sample");
        f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        Container content = f.getContentPane();
        final JProgressBar progressBar = new JProgressBar();
        progressBar.setValue(val);
        progressBar.setStringPainted(true);
        Border border = BorderFactory.createTitledBorder("Reading...");
        progressBar.setBorder(border);
        content.add(progressBar, BorderLayout.NORTH);
        f.setSize(300, 100);
        f.setVisible(true);
 
        Timer timer = new Timer(1000, new ActionListener() {
            public void actionPerformed(ActionEvent arg0) {
                progressBar.setValue(++val);
            }
        });
        timer.start();
    }
 
    public static void main(String args[]) {
        new Main();
    }
}