在JFrame关闭时运行函数

Question

void terminate() {}
protected JFrame frame = new JFrame();

frame当我按下关闭按钮时,如何运行终止功能？

编辑:我试图运行它,但由于某种原因它不打印测试(但程序关闭).有谁知道可能是什么问题？

frame.addWindowListener(new WindowAdapter() {
    public void WindowClosing(WindowEvent e) {
        System.out.println("test");
        frame.dispose();
    }
});

Answer 1

您可以使用addWindowListener:

frame.addWindowListener(new WindowAdapter()
{
    public void windowClosing(WindowEvent e)
    {
        ... //call terminate
        ...
    }
});

请参见void windowClosing(WindowEvent e)和Class WindowAdapter.

Answer 2

您不仅需要添加窗口侦听器,还必须将默认关闭操作设置为关闭时不执行任何操作.这允许您的代码执行.

    frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    frame.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosing(WindowEvent event) {
            exitProcedure();
        }
    });

最后,您必须调用System exit来实际停止运行程序.

public void exitProcedure() {
    frame.dispose();
    System.exit(0);
}