如何捕获JFrame的close按钮单击事件？

Question

我想在单击JFrame标题栏的红色close按钮时调用一个方法confirmExit()。

我如何捕捉那个事件？

Answer 1

import javax.swing.JOptionPane;
import javax.swing.JFrame;

/*Some piece of code*/
frame.addWindowListener(new java.awt.event.WindowAdapter() {
    @Override
    public void windowClosing(java.awt.event.WindowEvent windowEvent) {
        if (JOptionPane.showConfirmDialog(frame, 
            "Are you sure you want to close this window?", "Close Window?", 
            JOptionPane.YES_NO_OPTION,
            JOptionPane.QUESTION_MESSAGE) == JOptionPane.YES_OPTION){
            System.exit(0);
        }
    }
});

如果您还想防止窗口关闭，除非用户选择“是”，您可以添加：

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);