我想问一下这为什么会报错，用的eclipse

package cn.sxt.game;

import javax.swing.JFrame;

public class MyGameFrame extends JFrame{

//初始化窗口
public void launchFrame() {
    this.setTitle("飞机游戏作品");
    this.setVisible(true);//窗口可见
    this.setSize(500,500);//设置窗口大小
    this.setLocation(300,300);
    
    this.addWindowListener(new WindowAdapter() {
        @Override
        public void windowClosed(WindowEvent e) {
            System.exit(0);
        }    
    });
}

public static void main(String[] args) {
    MyGameFrame f = new MyGameFrame();
    f.launchFrame();
}

}

#############################################################
Exception in thread "main" java.lang.Error: Unresolved compilation problems:
The method addWindowListener(WindowListener) in the type Window is not applicable for the arguments (new WindowAdapter(){})
WindowAdapter cannot be resolved to a type
WindowEvent cannot be resolved to a type

at cn.sxt.game.MyGameFrame.launchFrame(MyGameFrame.java:20)
at cn.sxt.game.MyGameFrame.main(MyGameFrame.java:33)

报错日志的行数和代码的行数对不上，估计修改完没有保存。