//: c14:ColorBoxes.java // Using the Runnable interface. // <applet code=ColorBoxes width=500 height=400> // <param name=grid value="12"> // <param name=pause value="50"></applet> import javax.swing.*; import java.awt.*; import java.awt.event.*; import java.util.*; import com.bruceeckel.swing.*; class CBox extends JPanel implements Runnable { private Thread t; private int pause; private static final Color[] colors = { Color.BLACK, Color.BLUE, Color.CYAN, Color.DARK_GRAY, Color.GRAY, Color.GREEN, Color.LIGHT_GRAY, Color.MAGENTA, Color.ORANGE, Color.PINK, Color.RED, Color.WHITE, Color.YELLOW }; private static Random rand = new Random(); private static final Color newColor() { return colors[rand.nextInt(colors.length)]; } private Color cColor = newColor(); public void paintComponent(Graphics g) { super.paintComponent(g); g.setColor(cColor); Dimension s = getSize(); g.fillRect(0, 0, s.width, s.height); } public CBox(int pause) { this.pause = pause; t = new Thread(this); t.start(); } public void run() { while(true) { cColor = newColor(); repaint(); try { t.sleep(pause); } catch(InterruptedException e) { throw new RuntimeException(e); } } } } public class ColorBoxes extends JApplet { private boolean isApplet = true; private int grid = 12; private int pause = 50; public void init() { // Get parameters from Web page: if(isApplet) { String gsize = getParameter("grid"); if(gsize != null) grid = Integer.parseInt(gsize); String pse = getParameter("pause"); if(pse != null) pause = Integer.parseInt(pse); } Container cp = getContentPane(); cp.setLayout(new GridLayout(grid, grid)); for(int i = 0; i < grid * grid; i++) cp.add(new CBox(pause)); } public static void main(String[] args) { ColorBoxes applet = new ColorBoxes(); applet.isApplet = false; if(args.length > 0) applet.grid = Integer.parseInt(args[0]); if(args.length > 1) applet.pause = Integer.parseInt(args[1]); Console.run(applet, 500, 400); } } ///:~