如何在Java中将消息从工作线程传递到GUI

问题描述：

如何将消息从工作线程传递到Java中的GUI?我知道在Android中这可以通过处理程序和Messages类来实现.但是我希望Java中的同一件事可以帮助任何人.提前致谢.Ranganath.tm

How to pass the message from working thread to GUI in java? I know in Android this can be achieved through handlers and Messages Class. But I want the same thing in Java can any one help me. Thanks in advance. Ranganath.tm

答

您必须使用

You must use SwingUtilities.invokeLater, because Swing components must only be accessed from the event dispatch thread.

此方法的javadoc包含指向有关线程的Swing教程的链接.点击此链接.

The javadoc of this method has a link to the Swing tutorial about threads. Follow this link.

这是一个例子:

public class SwingWithThread {
    private JLabel label;

    // ...

    public void startBackgroundThread() {
        Runnable r = new Runnable() {
            @Override
            public void run() {
                try {
                    // simulate some background work
                    Thread.sleep(5000L);
                }
                catch (InterruptedException e) {
                    // ignore
                }

                // update the label IN THE EDT!
                SwingUtilities.invokeLater(new Runnable() {
                    @Override
                    public void run() {
                        label.setText("Background thread has stopped");
                    }
                });
            };
        };

        new Thread(r).start();
    }
}

如何在Java中将消息从工作线程传递到GUI

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