Java-关闭JFrame窗口时的消息

基本上，您几乎完全正确。有些事情并没有正确拼写，还有错别字。

首先删除您的

WindowClosing

window

Window

addWindowListener(newWindowAdapter());

addWindowListener(new WindowAdapter() {  public void windowClosing(WindowEvent e) {    int confirmed = JOptionPane.showConfirmDialog(null,         "Are you sure you want to exit the program?", "Exit Program Message Box",        JOptionPane.YES_NO_OPTION);    if (confirmed == JOptionPane.YES_OPTION) {      dispose();    }  }});