如题，怎么解决？尽量不要粘贴代码，说明原因即可。其他错误不用管，谢谢

 package Tank;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
//主程序
public class Game extends JFrame{
    public static void main(String[] args) {
        Game game=new Game();
    }
    Game(){
        MyPanel mp=new MyPanel();
        this.add(mp);
        mp.setBackground(Color.BLACK);
        this.setBounds(100,100,400,300);
        this.setVisible(true);
        this.addKeyListener(mp);
        this.addWindowListener(new WindowAdapter(){
            public void windowClosing(WindowEvent e) {
                Game.this.setVisible(false);
                System.exit(0);
            }
        });
    }
}
//面板区域
class MyPanel extends JPanel implements KeyListener{
    Hero hero=null;
    MyPanel(){
        hero=new Hero(150,200);
    }
    public void paint(Graphics g){
        super.paint(g);
        this.drawTank(hero.getX(), hero.getY(), g, 0, 0);
    }
    public void drawTank(int x,int y,Graphics g,int direct,int type){
        switch(type){
        case 0:
            g.setColor(Color.YELLOW);
            break;
        case 1:
            g.setColor(Color.CYAN);
            break;
        }
        switch(direct){
        case 0:
            g.fillRect(x, y, 5, 30);
            g.fill3DRect(x+15, y, 5, 30,false);
            g.fill3DRect(x+5,y+5, 10, 20,false);
            g.fillOval(x+5, y+10, 10, 10);
            g.drawLine(x+10, y+17, x+10, y);
            break;
        case 1:
            /*g.fillRect(x, y, 5, 30);
            g.fill3DRect(x+15, y, 5, 30,false);
            g.fill3DRect(x+5,y+5, 10, 20,false);
            g.fillOval(x+5, y+10, 10, 10);
            g.drawLine(x+10, y+17, x+10, y);
            break;
        case 2:
            g.fillRect(x, y, 5, 30);
            g.fill3DRect(x+15, y, 5, 30,false);
            g.fill3DRect(x+5,y+5, 10, 20,false);
            g.fillOval(x+5, y+10, 10, 10);
            g.drawLine(x+10, y+17, x+10, y);
            break;
        case 3:
            g.fillRect(x, y, 5, 30);
            g.fill3DRect(x+15, y, 5, 30,false);
            g.fill3DRect(x+5,y+5, 10, 20,false);
            g.fillOval(x+5, y+10, 10, 10);
            g.drawLine(x+10, y+17, x+10, y);
            break;*/
        }
    }
    //键盘处理
    @Override
    public void keyTyped(KeyEvent e) {}
    @Override
    public void keyPressed(KeyEvent e) {
        if(e.getKeyCode()==KeyEvent.VK_W);{
            hero.setDirect(0);
            hero.moveUp();
            System.out.println("按下  "+e.getKeyChar());
            System.out.println("x -"+hero.x+"y-"+hero.y);
        }
        if(e.getKeyCode()==KeyEvent.VK_D){
            hero.setDirect(1);
            hero.moveRight();
            System.out.println("按下  "+e.getKeyChar());
            System.out.println("x -"+hero.x+"y-"+hero.y);
        }
        if(e.getKeyCode()==KeyEvent.VK_S){
            hero.setDirect(2);
            hero.moveDown();;
            System.out.println("按下  "+e.getKeyChar());
            System.out.println("x -"+hero.x+"y-"+hero.y);
        }
        if(e.getKeyCode()==KeyEvent.VK_A){
            hero.setDirect(3);
            hero.moveLeft();;
            System.out.println("按下  "+e.getKeyChar());
            System.out.println("x -"+hero.x+"y-"+hero.y);
        }
        this.repaint();
    }
    @Override
    public void keyReleased(KeyEvent e) {}
}
//坦克
class Tank{
    int direct;
    int speed=1;
    public int getSpeed() {
        return speed;
    }
    public void setSpeed(int speed) {
        this.speed = speed;
    }
    public int getDirect() {
        return direct;
    }
    public void setDirect(int direct) {
        this.direct = direct;
    }
    int x=0;
    int y=0;
    public int getX() {
        return x;
    }
    public void setX(int x) {
        this.x = x;
    }
    public int getY() {
        return y;
    }
    public void setY(int y) {
        this.y = y;
    }
    Tank(int x,int y){
        this.x=x;
        this.y=y;
    }
    public void moveUp(){
        y-=speed;
    }
    public void moveRight(){
        x+=speed;
    }
    public void moveDown(){
        y+=speed;
    }
    public void moveLeft(){
        x-=speed;
    }
}
//我的坦克
class Hero extends Tank{
    Hero(int x,int y){
        super(x,y);
    }
}

public void keyPressed(KeyEvent e) {

if(e.getKeyCode()==KeyEvent.VK_W);{

        hero.setDirect(0);
        hero.moveUp();
        System.out.println("按下  "+e.getKeyChar());
        System.out.println("x -"+hero.x+"y-"+hero.y);
    }

这里多了一个分号，所以无论你按什么键，分号后面的代码都会被执行。

hero.moveDown();;方法呢

程序太长了，你自己debug一下，在按键处理的地方设断点，然后跟踪程序看看问题究竟出在哪里