Question

javaSwing 关闭窗口，弹出消息框,无论我点击是，否 都关闭窗口，见代码！

//关闭窗口事件 private void WindowClosingForm(java.awt.event.WindowEvent evt) { int flag = JOptionPane.showConfirmDialog(null, "确定要退出吗", "退出", JOptionPane.OK_CANCEL_OPTION); if (flag == JOptionPane.OK_OPTION) { System.exit(0); } }

/*
即使我不加 IF语句，return; 窗口照样关闭
*/
我也去掉过System.exit(0); 这条语句也会关闭窗口

Answer 1

构造函数中加一句setDefaultCloseOperation(WindowConstants.DO_NOTHING_ON_CLOSE);

Answer 2

consume
protected voidconsume()
Consumes this event, if this event can be consumed. Only low-level,
system events can be consumed

isConsumedprotected booleanisConsumed()Returns whether this event has been consumed.