// private int score = 0;score是得分。import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.DataInputStream;import java.io.DataOutputStream;import java.io.IOException;import java.lang.InterruptedException;import java.lang.Runnable;import java.lang.System;import javax.microedition.lcdui.Canvas;import javax.microedition.lcdui.Command;import javax.microedition.lcdui.CommandListener;import javax.microedition.lcdui.Displayable;import javax.microedition.lcdui.Font;import javax.microedition.lcdui.Graphics;import javax.microedition.media.Manager;import javax.microedition.media.MediaException;import javax.microedition.media.Player;import javax.microedition.media.control.ToneControl;import javax.microedition.rms.RecordStore;import javax.microedition.rms.RecordStoreException;/** * The WormPit contains a Worm and some WormFood. The Worm will * slither around the pit in search of WormFood. If the Worm eats * it will grow in length. The Worm will be killed if it attempts * to slither past the edge of the pit or if it eats itself. */public class WormPit extends Canvas implements Runnable,CommandListener {		private Command goHome;	private PetMIDlet midlet;			    /** Current screen size in cells. */    static int CellWidth;    /** Current screen height in cells. */    static int CellHeight;    /** Initial offset for screen rendering. */    private static final int START_POS = 3;    /** Font height for rendering the score message. */    private static final int SCORE_CHAR_HEIGHT;    /** Font width for rendering the score message. */    private static final int SCORE_CHAR_WIDTH;    /** Height for two lines of score message text. */    private static final int SCORE_HEIGHT;    /** Default delay between worm repaints. (400 milliseconds) */    private static final int DEFAULT_WAIT = 400;    /** Maximum number of difficulty levels. (10) */    static final byte MAX_LEVELS = 10;    /** Color for target food object. (0x00ff00) */    static final int FOOD_COLOUR = 0x0000ff00;    /** Color for text objects. (0xff0000) */    static final int TEXT_COLOUR = 0x00ff0000;    /** Color for erasing worm cells. (0xffffff) */    static final int ERASE_COLOUR = 0x00ffffff;    /** Color for drawing worm cells. (0x000000) */    static final int DRAW_COLOUR = 0x00000000;    /** Size of a cell for worm rendering. */    public static final int CELL_SIZE = 5;    static {        Font defaultFont = Font.getDefaultFont();        SCORE_CHAR_WIDTH = defaultFont.charWidth('S');        SCORE_CHAR_HEIGHT = defaultFont.getHeight();        SCORE_HEIGHT = SCORE_CHAR_HEIGHT * 2;    }    /** Handle to target food. */    private WormFood myFood;    /** Handle to current worm object. */    private Worm myWorm;    /** Flag to indicate when the game is finished. */    private boolean gameOver = false;    /** Flag to indicate if current game is paused. */    private boolean gamePaused = false;    /** Flag to indicate game is restarted. */    private boolean gameRestart = false;    /** Flag to indicate forced repaint is needed. */    private boolean forceRedraw = true;    /** Flag to indicate the game is to be completely destroyed. */    private boolean gameDestroyed = false;    /** Current game score. */    private int score = 0;    /** Current game level. */    private int level = 5;    /** Number of pieces of food eaten since the last level change. */    private int foodEaten = 0;    /** Current screen width in pixels. */    private int width;    /** Current screen height in pixels. */    private int height;    /** Audio player for background tune. */    private Player audioPlayer;    /** Tone player. */    private Player tonePlayer;    /**     * Default constructor for worm pit.     * Initialized the food and worm objects.     */    public WormPit(PetMIDlet midlet) {    	    	this.midlet = midlet;		goHome=new Command("我要回家",Command.BACK,1);		addCommand(goHome);		setCommandListener(this);				        width = round(getWidth());        height = round(getHeight() - SCORE_HEIGHT);        WormPit.CellWidth = (width - (START_POS * 2)) / WormPit.CELL_SIZE;        WormPit.CellHeight = (height - (START_POS * 2)) / WormPit.CELL_SIZE;        myWorm = new Worm(this);        /* Generate food for worm to eat */        myFood = new WormFood(this);        int x = myFood.getX();        int y = myFood.getY();        while (myWorm.contains(x, y)) {            myFood.regenerate(); // regenerate if food placed under worm            x = myFood.getX();            y = myFood.getY();        }    }    /**     * Round the given value to next lowest number divisible by the     * cell size.     * @param val number to be rounded down     * @return rounded down value     */    private int round(int val) {        int delta = (val - (START_POS * 2)) % CELL_SIZE;        return (val - delta);    }    /**     * Set the difficulty level. If the new level is different from the     * current level, any game currently in progress is terminated and     * the score is lost.     * @param level value of new level requested     * @see #getLevel     */    public void setLevel(int level) {        if (this.level != level) {            this.level = level;            gameOver = true;            gamePaused = false;            foodEaten = 0;            score = 0;        }    }    /**     * Get the difficulty level.     * @return current game level     * @see #setLevel     */    public int getLevel() {        return level;    }    /**     * Get the score of this game.     * @return current score     */    public int getScore() {        return score;    }    /**     * Returns true if the given point is within the bounds of the     * worm pit.     * @param x x coordinate of point to check (0 - CellWidth)     * @param y y coordinate of point to check (0 - CellHeight)     * @return true, if coordinate is in the worm pit     */    static boolean isInBounds(int x, int y) {        if ((x < 0) || (x >= WormPit.CellWidth)) {            return false;        }        if ((y < 0) || (y >= WormPit.CellHeight)) {            return false;        }        return true;    }    /**     * Restart the game.     */    void restart() {        if (gamePaused) {            gamePaused = false;        } else {            myWorm.regenerate();            myFood.regenerate();            int x = myFood.getX();            int y = myFood.getY();            while (myWorm.contains(x, y)) {                myFood.regenerate(); // regenerate if food placed under worm                x = myFood.getX();                y = myFood.getY();            }            foodEaten = 0;            score = 0;            gameOver = false;            if ((audioPlayer != null) && (audioPlayer.getState() == Player.PREFETCHED)) {                try {                    audioPlayer.setMediaTime(0);                    audioPlayer.start();                } catch (MediaException me) {                }            }        }        forceRedraw = true;        synchronized (myWorm) {            myWorm.notifyAll();        }    }    /**     * Handle keyboard input. This is used for worm movement.     * @param keyCode pressed key is either Canvas arrow key (UP,     *  DOWN, LEFT, RIGHT) or simulated with KEY_NUM (2, 8, 4,6).     */    public void keyPressed(int keyCode) {        switch (getGameAction(keyCode)) {        case Canvas.UP:            myWorm.setDirection(Worm.UP);            break;        case Canvas.DOWN:            myWorm.setDirection(Worm.DOWN);            break;        case Canvas.LEFT:            myWorm.setDirection(Worm.LEFT);            break;        case Canvas.RIGHT:            myWorm.setDirection(Worm.RIGHT);            break;        case 0:            // There is no game action.. Use keypad constants instead            switch (keyCode) {            case Canvas.KEY_NUM2:                myWorm.setDirection(Worm.UP);                break;            case Canvas.KEY_NUM8:                myWorm.setDirection(Worm.DOWN);                break;            case Canvas.KEY_NUM4:                myWorm.setDirection(Worm.LEFT);                break;            case Canvas.KEY_NUM6:                myWorm.setDirection(Worm.RIGHT);