this.addWindowListener(this);
　　//按关闭按钮，啥事也不做
this.setDefaultCloseOperation(DO_NOTHING_ON_CLOSE);

3、实现windowClosing方法

* 关闭主窗口处理 @Override public void windowClosing(WindowEvent e) { int option = JOptionPane.showConfirmDialog( this , "确定退出系统?", "提示" , JOptionPane.YES_NO_OPTION); if (option == JOptionPane.YES_OPTION) if (e.getWindow() == this ) { this .dispose(); System.exit( 0 ); } else { return ; else if (option == JOptionPane.NO_OPTION){ if (e.getWindow() == this ) { return ;