2、创建主窗口类MainFrame

public class MainFrame extends JFrame{
int wid=700;
int high=700;
MyPanel mp;
public MainFrame(){
this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
this.setSize(wid, high);
this.setTitle("游戏主窗口");
this.setVisible(true);
mp=new MyPanel();
this.add(mp);
}
public static void main(String args[]){
MainFrame mf=new MainFrame();
}
}

2、创建主窗口类MainFrame

原文：https://www.cnblogs.com/liang-xp/p/11778678.html