java为什么不调用windowClosed？

Question

我有一个问题，为什么在我的测试代码中没有调用“windowClosed”方法，如下所示

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;

public class Tmp {

    class TFrame extends JFrame{
        private static final long serialVersionUID = -5729542298504858399L;

        public TFrame() {
            setTitle("title");
            setSize(300, 300);
        }
    }


    public static void main(String[] args) {
        final TFrame t = new Tmp().new TFrame();
        t.addWindowStateListener(new WindowAdapter() {
            @Override
            public void windowStateChanged(WindowEvent e) {
                super.windowStateChanged(e);
                System.out.println(e.getOldState() + "<-old new->" + e.getNewState());
            }
        });
        t.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosed(WindowEvent e) {
                super.windowClosed(e);
                System.out.println(e.getID() + "closed " + e.getNewState());
            }

            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.out.println(e.getID() + "closing" + e.getNewState());
            }
        });
        t.setVisible(true);
    }
}

如果我编写语句setDefaultCloseOperation（JFrame.DISPOSE\u ON\u CLOSE）或显式调用DISPOSE（）到TFrame，则会调用windowClosed（）

是否有人可以更详细地解释它，我不知道windowClosed（）编写侦听器的属性方式是什么，提前谢谢

根据Dan的一些指南进行了更新//////////////

import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JFrame;
import javax.swing.JOptionPane;

public class Tmp {

    class TFrame extends JFrame {
        // ignored .....
        t.addWindowListener(new WindowAdapter() {

            @Override
            public void windowClosed(WindowEvent e) {
                super.windowClosed(e);
                System.out.println(e.getID() + "closed " + e.getNewState());
            }

            @Override
            public void windowClosing(WindowEvent e) {
                super.windowClosing(e);
                System.out.println(e.getID() + "closing" + e.getNewState());
                int quit = JOptionPane.showConfirmDialog(t, "Are you sure to quit?");
                if(quit == JOptionPane.YES_OPTION){
                    t.dispose();
                }
                else if (quit == JOptionPane.NO_OPTION){
                    t.setVisible(false);
                }
            }
        });
        t.setVisible(true);
        t.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
    }
}

Answer 1

setDefaultCloseOperation的默认值为HIDE_ON_CLOSE。这样，窗口不会关闭，只会隐藏

将该值更改为其他值，可以使其实际关闭，而不仅仅是隐藏它，因此事件将被触发