import javax.swing.*;
import java.awt.*;


public class Test {

    /**
     * @param args
     */
    public static void main(String[] args) {
        // TODO Auto-generated method stub
        MainGui mainGui=new MainGui();

    }

}

class MyPanel extends JPanel implements Runnable
{
    int x=180;
    int y=10;
    int speed=5;
    long time=100;
    public void paint(Graphics g)
    {
        super.paint(g);
        g.setColor(Color.YELLOW);
        g.drawString("helloJava", x, y+=speed);
    }
    public MyPanel()
    {
        this.setBackground(Color.BLACK);
        Thread td=new Thread(this);
        td.start();
    }
    public void run() {

        while (true)
        {

            repaint();
            try 
            {
                Thread.sleep(time);
            }
            catch (Exception e)
            {
                e.printStackTrace();
            }
            
        }
    }

}
/*
 * 程序的主界面
 */
class MainGui extends JFrame
{
    //定义需要的组件
    JMenuBar jmb;
    JMenu jm1;
    JMenu jm2;
    JMenuItem jmi1;
    JMenuItem jmi2;
    JMenuItem jmi3;
    MyPanel mp=new MyPanel();
    public MainGui()
    {
        //初始化各个组件
        jmb=new JMenuBar();
        jm1=new JMenu("游戏");
        jm2=new JMenu("帮助");
        jmi1=new JMenuItem("开始游戏");
        jmi2=new JMenuItem("退出游戏");
        jmi3=new JMenuItem("游戏说明");
        //添加相关的组件
        jm1.add(jmi1);
        jm1.add(jmi2);
        jm2.add(jmi3);
        jmb.add(jm1);
        jmb.add(jm2);

        this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        this.setSize(400,300);
        this.add(jmb,BorderLayout.NORTH);
        this.add(mp);
        this.setVisible(true);
    }
}