救命啊～俄罗斯方块，不能显示所要求的控制动作，还有Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException异常抛出～

Question

如题代码在下面，大家看看吧，高手请指教

Answer 1

测试类：
package zw.xierui.game.test;import javax.swing.JFrame;
import zw.xierui.game.controller.Controller;
import zw.xierui.game.entities.Ground;
import zw.xierui.game.entities.ShapeFactory;
import zw.xierui.game.view.GamePanel;/**
 *
 * @author Fish
 */
public class test {
    public static void main(String args[]){
        ShapeFactory shapefactory = new ShapeFactory();
        Ground ground = new Ground();
        GamePanel gamepanel = new GamePanel();
        Controller controller = new Controller(ground, shapefactory, gamepanel);
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(gamepanel.getSize().width+10, gamepanel.getSize().height+35);
        frame.add(gamepanel);
        gamepanel.addKeyListener(controller);
        frame.addKeyListener(controller);
        
     
        frame.setVisible(true);
        controller.newGame();    }}

Answer 2

图形工厂：
package zw.xierui.game.entities;import java.util.Random;
import zw.xierui.game.listener.ShapeListener;/**
 *
 * @author Fish
 */
public class ShapeFactory {
    private int shapes[][][] =new int[][][]
    {
        {
            { 1,0,0,0,
              1,1,1,0,
              0,0,0,0,
              0,0,0,0},
                      
              {1,1,0,0,
               1,0,0,0,
               1,0,0,0,
               0,0,0,0},
               
               {1,1,1,0,
                0,0,1,0,
                0,0,0,0,
                0,0,0,0},
                
                {0,1,0,0,
                 0,1,0,0,
                 1,1,0,0,
                 0,0,0,0}
                
                
          
        }
   };
    public Shape makeShape(ShapeListener listener){
        System.out.println("Make a Shape");
        Shape shape = new Shape();
        shape.addShapeListener(listener);
        int type = new Random().nextInt(shapes.length);
        shape.setShape(shapes[type]);
        shape.setStataus(1);
        return new Shape();
    }}
障碍物：package zw.xierui.game.entities;/**
 *
 * @author Fish
 */
public class Ground {
    public void recieve(Shape shape){
        System.out.println("recieve a shape");    }
    public void drawMe(){
        System.out.println("Ground's drawMe");    }}
监听接口：
package zw.xierui.game.listener;import zw.xierui.game.entities.Shape;/**
 *
 * @author Fish
 */
public interface ShapeListener {
    public void shapeMoveDown(Shape shape);}
常量类：package zw.xierui.game.util;/**
 *
 * @author Fish
 */
public class Global
{
    public  static final int CELL_SIZE = 20;}

Answer 3

图形类：
package zw.xierui.game.entities;import java.awt.Color;
import java.awt.Graphics;
import zw.xierui.game.listener.ShapeListener;
import zw.xierui.game.util.Global;/**
 *
 * @author Fish
 */public class Shape {    private ShapeListener shapelistener;
    private int[][] shapeBody;
    private int status = 0;//图形现有状态
    private int top = 3;
    private int left = 3;
    public Shape()
    {
         new Thread(new ShapeDown()).start();
    }    public void moveLeft()
    {
        System.out.println("Shape's move left");
        left--;
    }
    public void moveRight()
    {
        System.out.println("Shape's move right");
        left++;
    }
    public void moveDown()
    {
        System.out.println("Shape's move down");
        top++;
    }
    public void rorate()
    {
        System.out.println("Shape's rorate");
        status = (status+1)%shapeBody.length;
    }
    public void drawMe(Graphics graphic)
    {
        System.out.println("shape's drawMe");
        graphic.setColor(Color.ORANGE);
        for(int x = 0;x<4;x++)
        {
            for(int y = 0; y<4;y++)
            {
                if(getFlagByPoint(x, y))
                {
                    graphic.fill3DRect((left+x)*Global.CELL_SIZE,
                            (top+y)*Global.CELL_SIZE,
                            Global.CELL_SIZE, Global.CELL_SIZE, true);
                }
            }
        }
    }
    private boolean getFlagByPoint(int x, int y)
    {
        return shapeBody[status][y * 4 + x] == 1;
    }
    private class ShapeDown implements Runnable
    {
        public void run()
        {
            while(true)
            {
                moveDown();
                shapelistener.shapeMoveDown(Shape.this);
                try
                {
                    Thread.sleep(1000);      
                }
                catch(InterruptedException ie)
                {
                    ie.printStackTrace();
                }
            }        }    }
    public void addShapeListener(ShapeListener shapelistener)
    {
        if(shapelistener != null)
        {
            this.shapelistener = shapelistener;
        }    }
    public void setShape(int shapeBody[][]){
        this.shapeBody = shapeBody; 
    }
    public void setStataus(int status){
        this.status = status;
    }}
控制器：package zw.xierui.game.controller;import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import zw.xierui.game.entities.Ground;
import zw.xierui.game.entities.Shape;
import zw.xierui.game.entities.ShapeFactory;
import zw.xierui.game.listener.ShapeListener;
import zw.xierui.game.view.GamePanel;/**
 *
 * @author Fish
 */
public class Controller extends KeyAdapter implements ShapeListener {
    private Ground ground;
    private Shape shape;
    private ShapeFactory shapefactory;
    private GamePanel gamepanel;
    
    @Override
    public void keyPressed(KeyEvent e)
    {
        switch(e.getKeyCode()){
            
        
            case KeyEvent.VK_UP:
                System.out.println("rorate");
                shape.rorate();
                break;
            case KeyEvent.VK_DOWN:
                System.out.println("down");
                shape.moveDown();
                break;
            case KeyEvent.VK_LEFT:
                System.out.println("left");
                shape.moveLeft();
                break;
            case KeyEvent.VK_RIGHT:
                System.out.println("right");
                shape.moveRight();
                break;      
        }
        gamepanel.display(ground, shape);    }    public void shapeMoveDown(Shape shape)
    {
        gamepanel.display(ground, shape);    }
    public void newGame(){
        shape = shapefactory.makeShape(this);
    }
    public Controller(Ground ground,ShapeFactory shapefactory,GamePanel gamepanel){
        super();
        this.gamepanel = gamepanel;
        this.ground = ground;
        this.shapefactory = shapefactory;
    }
}
游戏面板：package zw.xierui.game.view;import java.awt.Color;
import java.awt.Graphics;
import javax.swing.JPanel;
import zw.xierui.game.entities.Ground;
import zw.xierui.game.entities.Shape;
import zw.xierui.game.entities.ShapeFactory;
import zw.xierui.game.listener.ShapeListener;/**
 *
 * @author Fish
 */
public class GamePanel extends JPanel{
    private Ground ground;
    private Shape shape;
    private ShapeFactory shapefactory;
   // private ShapeListener l;
    public void display(Ground ground,Shape shape)
    {
        System.out.println("GamePanel's display");
        this.ground = ground;
        this.shape = shape;
        this.repaint();    }
    public GamePanel()
    {
        this.setSize(300, 300);    }    @Override
    protected void paintComponent(Graphics g)
    {
        g.setColor(new Color(0xcfcfcf));
        g.fillRect(0, 0, 300, 300);
        if(shape != null&& ground != null)
        {
        shape.drawMe(g);
        ground.drawMe();
        }
    }
}