java 组件更新_Java swing 组件更新必须在事件派遣线程吗？

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。