55 lines
1.5 KiB
Java
55 lines
1.5 KiB
Java
//: gui/ColorBoxes.java
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// A visual demonstration of threading.
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import javax.swing.*;
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import java.awt.*;
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import java.util.concurrent.*;
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import java.util.*;
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import static net.mindview.util.SwingConsole.*;
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class CBox extends JPanel implements Runnable {
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private int pause;
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private static Random rand = new Random();
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private Color color = new Color(0);
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public void paintComponent(Graphics g) {
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g.setColor(color);
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Dimension s = getSize();
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g.fillRect(0, 0, s.width, s.height);
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}
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public CBox(int pause) { this.pause = pause; }
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public void run() {
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try {
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while(!Thread.interrupted()) {
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color = new Color(rand.nextInt(0x1000000));
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repaint(); // Asynchronously request a paint()
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TimeUnit.MILLISECONDS.sleep(pause);
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}
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} catch(InterruptedException e) {
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// Acceptable way to exit
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}
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}
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}
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public class ColorBoxes extends JFrame {
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private int grid = 12;
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private int pause = 50;
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private static ExecutorService exec =
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Executors.newCachedThreadPool();
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public void setUp() {
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setLayout(new GridLayout(grid, grid));
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for(int i = 0; i < grid * grid; i++) {
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CBox cb = new CBox(pause);
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add(cb);
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exec.execute(cb);
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}
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}
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public static void main(String[] args) {
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ColorBoxes boxes = new ColorBoxes();
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if(args.length > 0)
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boxes.grid = new Integer(args[0]);
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if(args.length > 1)
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boxes.pause = new Integer(args[1]);
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boxes.setUp();
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run(boxes, 500, 400);
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}
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} ///:~
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