Question

我尝试选择按钮来执行客户端或服务器布局，但是当我单击服务器按钮时，发生了动作函数在13个线程中执行服务器，导致锁定布局，

我不知道为什么点击执行了其他线程？

/*
 main is thread 1 doing this task,but button action is thread 13 doing this task
*/
public class Main {
    public static void main(String args[]) {
        long threadId = Thread.currentThread().getId();
        System.out.println("Thread # " + threadId + " is doing this task");
        new Main().view();
    }

    private void view() {
        JFrame jFrame = new JFrame("Server");
        JPanel jPanel = new JPanel();
        JButton jButton = new JButton("test");
        jFrame.setLocation(300, 300);

        jPanel.setPreferredSize(new Dimension(350, 300));

        GroupLayout groupLayout=new GroupLayout(jPanel);
        jPanel.setLayout(groupLayout);

        groupLayout.setHorizontalGroup(
                groupLayout.createSequentialGroup()
                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED,
                         GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addComponent(jButton,0,groupLayout.DEFAULT_SIZE,GroupLayout.PREFERRED_SIZE)
                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED,
                         GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                );

        groupLayout.setVerticalGroup(
                groupLayout.createSequentialGroup()
                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED,
                         GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                .addGroup(groupLayout.createParallelGroup()
                        .addComponent(jButton,0,groupLayout.DEFAULT_SIZE,GroupLayout.PREFERRED_SIZE))
                .addPreferredGap(LayoutStyle.ComponentPlacement.RELATED,
                         GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
                );

        jButton.addActionListener(new ActionListener() {

            @Override
            public void actionPerformed(ActionEvent e) {
                long threadId = Thread.currentThread().getId();
                System.out.println("Thread # " + threadId + " is doing this task");
            }
        });
        jFrame.add(jPanel);
        jFrame.pack();
        jFrame.setFocusable(true);
        jFrame.setEnabled(true);
        jFrame.setVisible(true);
        jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }
}

我该如何解决这个问题？

Answer 1

在你的主要：

public static void main(String args[]) {
    long threadId = Thread.currentThread().getId();
    System.out.println("Thread # " + threadId + " is doing this task");
}

当前线程是初始线程，即启动应用程序的线程。

在你的按钮中：

jButton.addActionListener(new ActionListener() {

        @Override
        public void actionPerformed(ActionEvent e) {
            long threadId = Thread.currentThread().getId();
            System.out.println("Thread # " + threadId + " is doing this task");
        }

当前线程是EDT（事件调度线程）。这是Swing用来管理事件的线程。

您可以在Lesson: Concurrency in Swing中找到更多信息。阅读会很好，因为有一些＆＃34;规则＆＃34;使用Swing时关注。每个事件（点击，更新，...）都在EDT中完成。如果你在其中进行长时间处理，它将冻结GUI。

JButton双击发生新线程，为什么会发生这种情况

1 个答案: