package src;import javax.microedition.lcdui.*;import javax.microedition.lcdui.game.*;import java.util.*;import java.io.*;public class UFOCanvas extends GameCanvas implements Runnable {    private Display display;    private boolean sleeping;    private long frameDelay;    private Random rand;    private Sprite ufoSprite;    private int ufoXSpeed,  ufoYSpeed;    private Sprite[] roidSprite = new Sprite[5];//綺劇伒鏁扮粍    private long gametime;    private long gametimeoffset;    /**娓告垙鏆傚仠鍙橀噺*/    public boolean isPaused = false;    String pauseStr = "鏆傚仠";    String continueStr = "緇х畫";    /**娓告垙緇撴潫鍙橀噺*/    boolean gameOver = false;    int width;    int height;    public UFOCanvas(Display d) {        super(false);        width = getWidth();        height = getHeight();        display = d;        gametime = 0;        // Set the frame rate (30 fps)        frameDelay = 33;    }    public void start() {        // Set the canvas as the current screen        display.setCurrent(this);        // Initialize the random number generator        rand = new Random();        this.gametimeoffset = System.currentTimeMillis();        // Initialize the UFO and roids sprites        ufoXSpeed = ufoYSpeed = 0;        try {            ufoSprite = new Sprite(Image.createImage("/Saucer.png"));            ufoSprite.setPosition((getWidth() - ufoSprite.getWidth()) / 2,                    (getHeight() - ufoSprite.getHeight()) / 2);//鍒濆