package Blocks;import javax.microedition.lcdui.*;import javax.microedition.lcdui.game.GameCanvas;import javax.microedition.lcdui.game.Sprite;import java.util.Random;public class BallCanvas extends GameCanvas implements CommandListener, Runnable, LevelInterface {    public Display dis;    public Displayable disp;    public int keyState;    public Command back;        public Command submit;                private int drawX;    private int drawY;    public int width;    public int height;    private Image spriteImage, groundImage, stingImage, gameOver;    private Sprite ball;    private Sprite[] background = new Sprite[3];    private int[][] co = new int[3][2]; //鑳屾櫙綺劇伒鐨勫潗鏍