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将标签设置为在操作侦听器中可见

[英]Setting label to visible in an action listener

原文 2013-04-11 03:01:14 8 1 java/ swing/ actionlistener

I have a JFrame with a button on it. 我有一个带有按钮的JFrame。 When the user presses the button, a time consuming series of actions are performed. 当用户按下按钮时，将执行一系列耗时的操作。 I have a JLabel on the form that says "Please wait" that I want to become visible while the actions are being performed and then go invisible when they are completed. 我在表单上有一个JLabel，上面写着“请稍等”，我希望在执行操作时可以看到它们，而在完成操作后可以看到它们。 So, I put label.setVisible(true) at the beginning of the action listener and label.setVisible(false) at the end, but nothing happens. 因此，我将label.setVisible(true)放在动作侦听器的开头，并将label.setVisible(false)放在结尾，但是什么也没发生。

It seems like the displaying of the label was being queued until the actions were finished, so it just goes visible and then immediately invisible. 似乎标签的显示正在排队，直到操作完成为止，因此它只是可见，然后立即不可见。 How can I make sure the label becomes visible before continuing with the rest of the code in the action listener? 在继续执行动作侦听器中的其余代码之前，如何确保标签可见？

1 个解决方案

Use a SwingWorker . 使用SwingWorker 。 When the button is clicked call execute . 单击按钮后，调用执行。 Update the JLabel when done . 更新JLabel时完成。