效果圖如下：

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import java.awt.Color; import java.awt.Graphics; import java.awt.Image;class Star {int H, V;int x, y, z;int type;Star(int width, int height, int depth, int type){this.type = type;H = width / 2;V = height / 2;x = (int) (Math.random() * width) - H;y = (int) (Math.random() * height) - V;if ((x == 0) && (y == 0)){x = 10;}z = (int) (Math.random() * depth);}public void Draw(Graphics g, double rot){double X, Y;int h, v, hh, vv;int d;z -= 2;if (z < -63){z = 100;}hh = (x * 64) / (64 + z);vv = (y * 64) / (64 + z);X = (hh * Math.cos(rot)) - (vv * Math.sin(rot));Y = (hh * Math.sin(rot)) + (vv * Math.cos(rot));h = (int) X + H;v = (int) Y + V;if ((h < 0) || (h > (2 * H))){z = 100;}if ((v < 0) || (v > (2 * H))){z = 100;}GrayMe(g);if (type == 0){d = (100 - z) / 50;if (d == 0){d = 1;}g.fillRect(h, v, d, d);}else{d = (100 - z) / 20;g.drawLine(h - d, v, h + d, v);g.drawLine(h, v - d, h, v + d);if (z < 50){d /= 2;g.drawLine(h - d, v - d, h + d, v + d);g.drawLine(h + d, v - d, h - d, v + d);}}}public void GrayMe(Graphics g){if (z > 50){g.setColor(Color.gray);}else if (z > 25){g.setColor(Color.lightGray);}else{g.setColor(Color.white);}} }public class StarField extends java.applet.Applet implements Runnable {int Width, Height;Thread me = null;boolean suspend = false;Image im;Graphics offscreen;double rot, dx, ddx;int speed, stars, type;double defddx, max;Star pol[];public void init(){rot = 0;dx = 0;ddx = 0;Width = 400;//size().width;Height = 300;//size().height;System.out.println("Width=" + Width);System.out.println("Height=" + Height);String theSpeed = "25";//getParameter("speed");Show("speed", theSpeed);speed = (theSpeed == null) ? 50 : Integer.valueOf(theSpeed).intValue();String theStars = "250";//getParameter("stars");Show("stars", theStars);stars = (theStars == null) ? 30 : Integer.valueOf(theStars).intValue();String theType = "10";//getParameter("type");Show("type", theType);type = (theType == null) ? 0 : Integer.valueOf(theType).intValue();String theRot = "20";//getParameter("spin");Show("spin", theRot);rot = (theRot == null) ? 0 : Double.valueOf(theRot).doubleValue();String theMax = "0.1";//getParameter("maxspin");Show("maxspin", theRot);max = (theMax == null) ? 0.01 : Double.valueOf(theMax).doubleValue();String theddx = "2";//getParameter("ddx");Show("ddx", theddx);defddx = (theddx == null) ? 0.05 : Double.valueOf(theddx).doubleValue();try{im = createImage(Width, Height);offscreen = im.getGraphics();}catch (Exception e){offscreen = null;}pol = new Star[stars];for (int i = 0; i < stars; i++){pol[i] = new Star(Width, Height, 100, type);}}public void paint(Graphics g){if (offscreen != null){paintMe(offscreen);g.drawImage(im, 0, 0, this);}else{paintMe(g);}}public void paintMe(Graphics g){g.setColor(Color.black);g.fillRect(0, 0, Width, Height);//g.setColor( Color.gray );for (int i = 0; i < stars; i++){pol[i].Draw(g, rot);}}public void start(){if (me == null){me = new Thread(this);me.start();}}public void stop(){if (me != null){me.stop();me = null;}}public void run(){while (me != null){rot += dx;dx += ddx;if (dx > max){ddx = -defddx;}if (dx < -max){ddx = defddx;}try{Thread.sleep(speed);}catch (InterruptedException e) {}repaint();}}public void update(Graphics g){paint(g);}public boolean mouseDown(java.awt.Event evt, int x, int y){ddx = (ddx == 0) ? defddx : 0;return true;}public void Toggle(){if (me != null){if (suspend){me.resume();}else{me.suspend();}suspend = !suspend;}}public void Show(String theString, String thue){if (thue == null){System.out.println(theString + " : null");}else{System.out.println(theString + " : " + thue);}} }

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