如何捕获JFrame的关闭按钮单击事件？

Question

我想在confirmExit()单击JFrame标题栏的红色关闭按钮时调用方法.

我该如何捕获该事件？

如果用户选择不继续,我还想阻止窗口关闭.

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);
        }
    }
});

如果您还想阻止窗口关闭,除非用户选择"是",您可以添加:

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

Answer 2

覆盖windowClosing方法.

public void windowClosing(WindowEvent e)

当窗口处于关闭状态时调用它.此时可以覆盖关闭操作.