代码效果！！

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import java.applet.Applet;
import java.applet.AudioClip;
import java.awt.*;
import java.awt.image.MemoryImageSource;
import java.util.Random;

@SuppressWarnings("serial")
public class Test extends Applet implements Runnable {
  public Test() {
    m_mouseX = 0;
    m_mouseY = 0;
    m_sleepTime = 5;
    isError = false;
    isInitialized = false;
    rand = new Random();
    bits = 20000;
    bit_px = new double[bits];
    bit_py = new double[bits];
    bit_vx = new double[bits];
    bit_vy = new double[bits];
    bit_sx = new int[bits];
    bit_sy = new int[bits];
    bit_l = new int[bits];
    bit_f = new int[bits];
    bit_p = new int[bits];
    bit_c = new int[bits];
    ru = 50;
    rv = 50;
  }

public void init() {
    String s = getParameter("para_bits");
    if (s != null)
      bits = Integer.parseInt(s);
    s = getParameter("para_max");
    if (s != null)
      bit_max = Integer.parseInt(s);
    s = getParameter("para_blendx");
    if (s != null)
      ru = Integer.parseInt(s);
    s = getParameter("para_blendy");
    if (s != null)
      rv = Integer.parseInt(s);
    s = getParameter("para_sound");
    if (s != null)
      bit_sound = Integer.parseInt(s);
    m_nAppX = getSize().width;
    m_nAppY = getSize().height;
    m_centerX = m_nAppX / 2;
    m_centerY = m_nAppY / 2;
    m_mouseX = m_centerX;
    m_mouseY = m_centerY;
    resize(m_nAppX, m_nAppY);
    pixls = m_nAppX * m_nAppY;
    pixls2 = pixls - m_nAppX * 2;
    pix0 = new int[pixls];
    offImage = new MemoryImageSource(m_nAppX, m_nAppY, pix0, 0, m_nAppX);
    offImage.setAnimated(true);
    dbImg = createImage(offImage);
    for (int i = 0; i < pixls; i++)
      pix0[i] = 0xff000000;

sound1 = getAudioClip(getDocumentBase(), "firework.au");
    sound2 = getAudioClip(getDocumentBase(), "syu.au");
    for (int j = 0; j < bits; j++)
      bit_f[j] = 0;

isInitialized = true;
    start();
  }

private boolean stop;

public void run() {
    while (!isInitialized)
      try {
        Thread.sleep(200L);
      } catch (InterruptedException interruptedexception) {
      }
    do {
      for (int j = 0; j < pixls2; j++) {
        int k = pix0[j];
        int l = pix0[j + 1];
        int i1 = pix0[j + m_nAppX];
        int j1 = pix0[j + m_nAppX + 1];
        int i = (k & 0xff0000) >> 16;
        int k1 = ((((l & 0xff0000) >> 16) - i) * ru >> 8) + i;
        i = (k & 0xff00) >> 8;
        int l1 = ((((l & 0xff00) >> 8) - i) * ru >> 8) + i;
        i = k & 0xff;
        int i2 = (((l & 0xff) - i) * ru >> 8) + i;
        i = (i1 & 0xff0000) >> 16;
        int j2 = ((((j1 & 0xff0000) >> 16) - i) * ru >> 8) + i;
        i = (i1 & 0xff00) >> 8;
        int k2 = ((((j1 & 0xff00) >> 8) - i) * ru >> 8) + i;
        i = i1 & 0xff;
        int l2 = (((j1 & 0xff) - i) * ru >> 8) + i;
        int i3 = ((j2 - k1) * rv >> 8) + k1;
        int j3 = ((k2 - l1) * rv >> 8) + l1;
        int k3 = ((l2 - i2) * rv >> 8) + i2;
        pix0[j] = i3 << 16 | j3 << 8 | k3 | 0xff000000;
      }

rend();
      offImage.newPixels(0, 0, m_nAppX, m_nAppY);
      try {
        Thread.sleep(m_sleepTime);
      } catch (InterruptedException interruptedexception1) {
      }
    } while (!stop);
  }

public void update(Graphics g) {
    paint(g);
  }

public void paint(Graphics g) {
    g.drawImage(dbImg, 0, 0, this);
  }

public void start() {
    if (isError)
      return;
    isRunning = true;
    if (runner == null) {
      runner = new Thread(this);
      runner.start();
    }
  }

@SuppressWarnings("deprecation")
public void stop() {
    if (runner != null) {
      runner.stop();
      runner = null;
    }
  }

public boolean mouseMove(Event event, int i, int j) {
    m_mouseX = i;
    m_mouseY = j;
    return true;
  }

public boolean mouseDown(Event event, int i, int j) {
    m_mouseX = i;
    m_mouseY = j;
    int k = (int) (rand.nextDouble() * 256D);
    int l = (int) (rand.nextDouble() * 256D);
    int i1 = (int) (rand.nextDouble() * 256D);
    int j1 = k << 16 | l << 8 | i1 | 0xff000000;
    int k1 = 0;
    for (int l1 = 0; l1 < bits; l1++) {
      if (bit_f[l1] != 0)
        continue;
      bit_px[l1] = m_mouseX;
      bit_py[l1] = m_mouseY;
      double d = rand.nextDouble() * 6.2800000000000002D;
      double d1 = rand.nextDouble();
      bit_vx[l1] = Math.sin(d) * d1;
      bit_vy[l1] = Math.cos(d) * d1;
      bit_l[l1] = (int) (rand.nextDouble() * 100D) + 100;
      bit_p[l1] = (int) (rand.nextDouble() * 3D);
      bit_c[l1] = j1;
      bit_sx[l1] = m_mouseX;
      bit_sy[l1] = m_nAppY - 5;
      bit_f[l1] = 2;
      if (++k1 == bit_max)
        break;
    }

if (bit_sound > 1)
      sound2.play();
    return true;
  }

public boolean mouseExit(Event event, int i, int j) {
    m_mouseX = i;
    m_mouseY = j;
    return true;
  }

// (JAVA世纪网,java2000.net)
  void rend() {
    boolean flag2 = false;
    for (int k = 0; k < bits; k++)
      switch (bit_f[k]) {
      default:
        break;

case 1: // '\001'
        bit_vy[k] += rand.nextDouble() / 50D;
        bit_px[k] += bit_vx[k];
        bit_py[k] += bit_vy[k];
        bit_l[k]--;
        if (bit_l[k] == 0 || bit_px[k] < 0.0D || bit_py[k] < 0.0D || bit_px[k] > (double) m_nAppX
            || bit_py[k] > (double) (m_nAppY - 3)) {
          bit_c[k] = 0xff000000;
          bit_f[k] = 0;
        } else if (bit_p[k] == 0) {
          if ((int) (rand.nextDouble() * 2D) == 0)
            bit_set((int) bit_px[k], (int) bit_py[k], -1);
        } else {
          bit_set((int) bit_px[k], (int) bit_py[k], bit_c[k]);
        }
        break;

case 2: // '\002'
        bit_sy[k] -= 5;
        if ((double) bit_sy[k] <= bit_py[k]) {
          bit_f[k] = 1;
          flag2 = true;
        }
        if ((int) (rand.nextDouble() * 20D) == 0) {
          int i = (int) (rand.nextDouble() * 2D);
          int j = (int) (rand.nextDouble() * 5D);
          bit_set(bit_sx[k] + i, bit_sy[k] + j, -1);
        }
        break;
      }

if (flag2 && bit_sound > 0)
      sound1.play();
  }

void bit_set(int i, int j, int k) {
    int l = i + j * m_nAppX;
    pix0[l] = k;
  }

private int m_nAppX;
  private int m_nAppY;
  private int m_centerX;
  private int m_centerY;
  private int m_mouseX;
  private int m_mouseY;
  private int m_sleepTime;
  private boolean isError;
  boolean isRunning;
  boolean isInitialized;
  Thread runner;
  int pix0[];
  MemoryImageSource offImage;
  Image dbImg;
  int pixls;
  int pixls2;
  Random rand;
  int bits;
  double bit_px[];
  double bit_py[];
  double bit_vx[];
  double bit_vy[];
  int bit_sx[];
  int bit_sy[];
  int bit_l[];
  int bit_f[];
  int bit_p[];
  int bit_c[];
  int bit_max;
  int bit_sound;
  int ru;
  int rv;
  AudioClip sound1;
  AudioClip sound2;
}