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Does JOptionPane block the flow of events

My application uses JOptionPaneat some points to enter information. At the same time, when displayed JOptionPane, changes may occur in the GUI that are made from other clients over the network. This can be text on JTextArea, or nodes changing to JTree.

Does this mean that I need to create JOptionPanein a new thread so that I do not have problems with changes made over the course of JOptionPane?

I looked at several places on the Internet, but I did not get a clear answer.

ps JOptionPaneis created when the user clicks a button.

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, " " . , , . . System.out, , JOptionPane , - Swing JTextArea ( EDT).

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JScrollPane;
import javax.swing.JTextArea;
import javax.swing.Timer;
import java.awt.BorderLayout;
import java.awt.EventQueue;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class UpdateOptionPane {

  private static void showUI(){
    final JFrame testFrame = new JFrame( "TestFrame" );

    final JTextArea textArea = new JTextArea(  );
    testFrame.add( new JScrollPane( textArea ), BorderLayout.CENTER );

    Timer timer = new Timer( 1000, new ActionListener() {
      @Override
      public void actionPerformed( ActionEvent e ) {
        textArea.append( "bla" );
      }
    } );
    timer.setRepeats( true );
    timer.start();
    JButton button = new JButton( "Click me" );
    button.addActionListener( new ActionListener() {
      @Override
      public void actionPerformed( ActionEvent e ) {
        System.out.println("Before option pane");
        JOptionPane.showMessageDialog( testFrame, "A message dialog" );
        System.out.println("After option pane");
      }
    } );
    testFrame.add( button, BorderLayout.SOUTH );
    testFrame.setDefaultCloseOperation( JFrame.EXIT_ON_CLOSE );
    testFrame.pack();
    testFrame.setVisible( true );
  }

  public static void main( String[] args ) {
    EventQueue.invokeLater( new Runnable() {
      @Override
      public void run() {
        showUI();
      }
    } );
  }
}
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JoptionPane JDialog. , JDialog

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