Java：我不能多次运行JTextArea吗？

欢迎使用阻塞事件调度线程。

EDT负责处理重涂请求等。您绝不应该执行任何阻止EDT的操作，而应该使用类似

SwingWorker

查看Swing中的并发以了解更多详细信息

更新了示例

import java.awt.BorderLayout;import java.awt.EventQueue;import java.util.List;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.Jtextarea;import javax.swing.SwingWorker;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class Testtextarea03 {    public static void main(String[] args) {        new Testtextarea03();    }    public Testtextarea03() {        EventQueue.invokeLater(new Runnable() { @Override public void run() {     try {         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());     } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {     }     Jframe frame = new Jframe("Test");     frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);     frame.setLayout(new BorderLayout());     frame.add(new TestPane());     frame.pack();     frame.setLocationRelativeTo(null);     frame.setVisible(true); }        });    }    public class TestPane extends JPanel {        private Jtextarea textarea;        private TestPane() { setLayout(new BorderLayout()); textarea = new Jtextarea(10, 10); add(new JScrollPane(textarea)); new TextWorker().execute();        }        public class TextWorker extends SwingWorker<Void, String> { @Override protected void process(List<String> chunks) {     for (String text : chunks) {         textarea.append(text + "n");     } } @Override protected Void doInBackground() throws Exception {     Thread.sleep(1000);     for (int x = 0; x < 10; x++) {         publish(String.valueOf(x));         Thread.sleep(250);     }     return null; }        }    }}

或摇摆计时器

import java.awt.BorderLayout;import java.awt.EventQueue;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.util.List;import javax.swing.Jframe;import javax.swing.JPanel;import javax.swing.JScrollPane;import javax.swing.Jtextarea;import javax.swing.SwingWorker;import javax.swing.Timer;import javax.swing.UIManager;import javax.swing.UnsupportedLookAndFeelException;public class Testtextarea03 {    public static void main(String[] args) {        new Testtextarea03();    }    public Testtextarea03() {        EventQueue.invokeLater(new Runnable() { @Override public void run() {     try {         UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());     } catch (ClassNotFoundException | InstantiationException | IllegalAccessException | UnsupportedLookAndFeelException ex) {     }     Jframe frame = new Jframe("Test");     frame.setDefaultCloseOperation(Jframe.EXIT_ON_CLOSE);     frame.setLayout(new BorderLayout());     frame.add(new TestPane());     frame.pack();     frame.setLocationRelativeTo(null);     frame.setVisible(true); }        });    }    public class TestPane extends JPanel {        private Jtextarea textarea;        private int x;        private TestPane() { setLayout(new BorderLayout()); textarea = new Jtextarea(10, 10); add(new JScrollPane(textarea)); Timer timer = new Timer(250, new ActionListener() {     @Override     public void actionPerformed(ActionEvent e) {         x++;         textarea.append(String.valueOf(x) + "n");     } }); timer.setRepeats(true); timer.setCoalesce(true); timer.start();        } }    }