mainFrame.addWindowListener(new WindowListener() {
@Override
public void windowClosing(WindowEvent e) {
if (JOptionPane.showConfirmDialog(mainFrame, "Are you sure you want to quit?
我爲虛擬鍵盤實現了一個樣例類並運行此VirtualKeyboardTest。鍵盤出現,但主要問題是單擊x按鈕時它不能正確關閉。如何才能糾正這個? import java.awt.*;
import java.awt.event.*;
public class VirtualKeyboardTest
{
public static void main(String args[])