Java Swing How to - Create Modal JDialog without blocking execution

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Question

We would like to know how to create Modal JDialog without blocking execution.

Answer

import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
// w  w w.j av  a2 s .c o  m
import javax.swing.JDialog;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JProgressBar;
import javax.swing.SwingUtilities;
import javax.swing.Timer;

public class Main extends JFrame {

  private Timer timer;
  private JDialog blocker;

  public Main() {
    setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    setSize(300, 200);
    blocker = new JDialog(this, true);
    blocker.setLayout(new FlowLayout());
    blocker.add(new JLabel("I'm blocking EDT!"));
    JProgressBar progress = new JProgressBar();
    progress.setIndeterminate(true);
    blocker.add(progress);
    blocker.pack();

    timer = new Timer(3000, new ActionListener() {
      public void actionPerformed(ActionEvent e) {
        doSomeWork();
      }
    });
    timer.setRepeats(false);
    timer.start();
  }
  private void doSomeWork() {
    Runnable runnable = new Runnable() {
      public void run() {
        showBlocker();
        try {
          Thread.sleep(2000);
        } catch (Exception ex) {
        } finally {
          hideBlocker();
        }
      }
    };
    new Thread(runnable).start();
  }

  private void showBlocker() {
     SwingUtilities.invokeLater(new Runnable() {
      public void run() {
         blocker.setLocationRelativeTo(Main.this);
        blocker.setVisible(true);
      }
    });
  }

  private void hideBlocker() {
     SwingUtilities.invokeLater(new Runnable() {
      public void run() {
         blocker.setVisible(false);
        timer.restart();
      }
    });
  }

  public static void main(String[] args) {
    new Main().setVisible(true);
  }
}

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