import java.awt.*;import javax.swing.*;import java.awt.event.*;class Fort extends JFrame implements  Runnable{    TankFrame tankFrame;    public Image image;    boolean life;    int grade;    String str;    int x,y;    public Fort(TankFrame tankFrame,int grade) {        this.tankFrame=tankFrame;        this.grade=grade;        str="游戲結(jié)束，你失敗了，是否再來";        x=240;        y=560;        life=true;        image = Toolkit.getDefaultToolkit().getImage("images/base.jpg");    }    public void paint(Graphics g){        g.setColor(Color.BLACK);        Font font=new Font("Serif",Font.PLAIN,28);        g.setFont(font);        g.drawImage(image, 240, 560, 40,40,null);        if(!life){            if(grade==4){                str="恭喜你過關(guān)了";                g.drawString(str, x-200, y);            }            else{                g.drawString(str, x-160, y);            }        }    }    public void Excut(){        y--;        if(!life){            image = Toolkit.getDefaultToolkit().getImage("images/60.jpg");        }    }    public void run(){        while(y>260){            Excut();            try {                               Thread.sleep(180);            } catch (InterruptedException ex) {            }        }    }}