Java swing 组件更新必须在事件派遣线程吗？

[codechaser]

package volume2.chapter3;

import javax.swing.*;
import java.awt.*;

public class JFrameDispatchEventTest extends JFrame {

    public JFrameDispatchEventTest(){
        JPanel panel = new JPanel(new BorderLayout());
        JButton test = new JButton("Test");
        JTextArea textArea = new JTextArea();

        panel.add(test,BorderLayout.NORTH);
        panel.add(new JScrollPane(textArea),BorderLayout.SOUTH);

        System.out.println(Thread.currentThread());
        test.addActionListener((e) -> {
            textArea.append(Thread.currentThread().toString()+"\n");
            Thread t = new Thread(new Runnable() {
                @Override
                public void run() {
                    textArea.append("Another thread runs in thread: "+Thread.currentThread()+"\n");
                }
            });
            t.start();
        });

        add(panel);
        setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        setVisible(true);
    }

    public static void main(String[] args) {
        SwingUtilities.invokeLater(JFrameDispatchEventTest::new);
    }
}

这里我新开了一个线程更新textArea也没有什么问题啊。