這個問題在這里已經有了答案：
![有沒有辦法去除 JOptionPanel 中按鈕的焦點？[復制]](https://img.uj5u.com/2021/12/20/04abee2fc2c64339a6a79b6936afd128.png)
uj5u.com熱心網友回復：
在這種情況下，您可能需要一個全域事件偵聽器，以在訊息對話框出現時清除焦點。下面是一個例子：
import java.awt.AWTEvent;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.FocusEvent;
import javax.swing.FocusManager;
import javax.swing.JOptionPane;
import javax.swing.SwingUtilities;
public class TestFocus {
private final AWTEventListener focusListener = this::removeFocus;
public static void main(String[] args) {
SwingUtilities.invokeLater(new TestFocus()::initUI);
}
private void initUI() {
Toolkit.getDefaultToolkit().addAWTEventListener(focusListener, AWTEvent.FOCUS_EVENT_MASK);
JOptionPane.showMessageDialog(null, "Here is no Focus on button", "No focus!", JOptionPane.PLAIN_MESSAGE);
Toolkit.getDefaultToolkit().removeAWTEventListener(focusListener); // to be safe remove it twice.
}
private void removeFocus(AWTEvent e) {
if (e instanceof FocusEvent && ((FocusEvent) e).getID() == FocusEvent.FOCUS_GAINED) {
Toolkit.getDefaultToolkit().removeAWTEventListener(focusListener);
FocusManager.getCurrentKeyboardFocusManager().clearFocusOwner();
}
}
}
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