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我一直在想这是怎么做了的。自从学了Java后，我一直在琢磨,能不能有Java来实现。作为到今天为止只学了8天菜鸟，我自然是写不出来的。寻寻觅觅，终于在网上找到了大神写的（原帖： http://www.cnblogs.com/x110/p/4239585.html ）。代码如下：（命名为 Rain.java，点击运行即可 ） import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.awt.event.KeyAdapter; import java.awt.event.KeyEvent; import java.awt.image.MemoryImageSource; import java.util.Random; import javax.swing.JDialog; import javax.swing.JPanel; import javax.swing.Timer; public class Rain extends JDialog implements ActionListener { private Random random = new Random(); private Dimension screenSize; private JPanel graphicsPanel; //行高,列宽 private final static int gap = 20; //存放雨点顶部的位置信息(marginTop) private int[] posArr; //行数 private int lines; //列数 private int columns; public Rain() { initComponents(); } private void initComponents() { setLayout(new BorderLayout()); graphicsPanel = new GraphicsPanel(); add(graphicsPanel, BorderLayout.CENTER); //设置光标不可见 Toolkit defaultToolkit = Toolkit.getDefaultToolkit(); Image image = defaultToolkit.createImage(new MemoryImageSource(0, 0, null, 0, 0)); Cursor invisibleCursor = defaultToolkit.createCustomCursor(image, new Point(0, 0), "cursor"); setCursor(invisibleCursor); //ESC键退出 KeyPressListener keyPressListener = new KeyPressListener(); this.addKeyListener(keyPressListener); //this.setAlwaysOnTop(true); //去标题栏 this.setUndecorated(true); //全屏 this.getGraphicsConfiguration().getDevice().setFullScreenWindow(this); this.setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE); setVisible(true); screenSize = Toolkit.getDefaultToolkit().getScreenSize(); lines = screenSize.height / gap; columns = screenSize.width / gap; posArr = new int[columns + 1]; random = new Random(); for (int i = 0; i < posArr.length; i++) { posArr = random.nextInt(lines); } //每秒10帧 new Timer(100, this).start(); } /** * @return 随机字符 */ private char getChr() { return (char) (random.nextInt(94) + 33); } @Override public void actionPerformed(ActionEvent e) { graphicsPanel.repaint(); } private class GraphicsPanel extends JPanel { @Override public void paint(Graphics g) { Graphics2D g2d = (Graphics2D) g; g2d.setFont(getFont().deriveFont(Font.BOLD)); g2d.setColor(Color.BLACK); g2d.fillRect(0, 0, screenSize.width, screenSize.height); //当前列 int currentColumn = 0; for (int x = 0; x < screenSize.width; x += gap) { int endPos = posArr[currentColumn]; g2d.setColor(Color.CYAN); g2d.drawString(String.valueOf(getChr()), x, endPos * gap); int cg = 0; for (int j = endPos - 15; j < endPos; j++) { //颜色渐变 cg += 20; if (cg > 255) { cg = 255; } g2d.setColor(new Color(0, cg, 0)); g2d.drawString(String.valueOf(getChr()), x, j * gap); } //每放完一帧，当前列上雨点的位置随机下移1~5行 posArr[currentColumn] += random.nextInt(5); //当雨点位置超过屏幕高度时，重新产生一个随机位置 if (posArr[currentColumn] * gap > getHeight()) { posArr[currentColumn] = random.nextInt(lines); } currentColumn++; } } } private class KeyPressListener extends KeyAdapter { @Override public void keyPressed(KeyEvent e) { if (e.getKeyCode() == KeyEvent.VK_ESCAPE) { System.exit(0); } } } public static void main(String[] args) { new Rain(); } } （有好多还是看不懂。看来成为大神的路，还有很远。 最后一句，愿大家忠于理想，面对现实！好好努力…… 就这样吧， 鞠躬，下台……） |
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