//: ColorBoxes2.java
//////////////////////////////////////////////////
// Copyright (c) Bruce Eckel, 1998
// Source code file from the book "Thinking in Java"
// All rights reserved EXCEPT as allowed by the
// following statements: You can freely use this file
// for your own work (personal or commercial),
// including modifications and distribution in
// executable form only. Permission is granted to use
// this file in classroom situations, including its
// use in presentation materials, as long as the book
// "Thinking in Java" is cited as the source.
// Except in classroom situations, you cannot copy
// and distribute this code; instead, the sole
// distribution point is http://www.BruceEckel.com
// (and official mirror sites) where it is
// freely available. You cannot remove this
// copyright and notice. You cannot distribute
// modified versions of the source code in this
// package. You cannot use this file in printed
// media without the express permission of the
// author. Bruce Eckel makes no representation about
// the suitability of this software for any purpose.
// It is provided "as is" without express or implied
// warranty of any kind, including any implied
// warranty of merchantability, fitness for a
// particular purpose or non-infringement. The entire
// risk as to the quality and performance of the
// software is with you. Bruce Eckel and the
// publisher shall not be liable for any damages
// suffered by you or any third party as a result of
// using or distributing software. In no event will
// Bruce Eckel or the publisher be liable for any
// lost revenue, profit, or data, or for direct,
// indirect, special, consequential, incidental, or
// punitive damages, however caused and regardless of
// the theory of liability, arising out of the use of
// or inability to use software, even if Bruce Eckel
// and the publisher have been advised of the
// possibility of such damages. Should the software
// prove defective, you assume the cost of all
// necessary servicing, repair, or correction. If you
// think you've found an error, please email all
// modified files with clearly commented changes to:
// Bruce@EckelObjects.com. (Please use the same
// address for non-code errors found in the book.)
/////////////////////////////////////////////////
// Balancing thread use
import java.awt.*;
import java.awt.event.*;
import java.util.*;
class CBox2 extends Canvas {
private static final Color[] colors = {
Color.black, Color.blue, Color.cyan,
Color.darkGray, Color.gray, Color.green,
Color.lightGray, Color.magenta,
Color.orange, Color.pink, Color.red,
Color.white, Color.yellow
};
private Color cColor = newColor();
private static final Color newColor() {
return colors[
(int)(Math.random() * colors.length)
];
}
void nextColor() {
cColor = newColor();
repaint();
}
public void paint(Graphics g) {
g.setColor(cColor);
Dimension s = getSize();
g.fillRect(0, 0, s.width, s.height);
}
}
class CBoxVector
extends Vector implements Runnable {
private Thread t;
private int pause;
public CBoxVector(int pause) {
this.pause = pause;
t = new Thread(this);
}
public void go() { t.start(); }
public void run() {
while(true) {
int i = (int)(Math.random() * size());
((CBox2)elementAt(i)).nextColor();
try {
t.sleep(pause);
} catch(InterruptedException e) {}
}
}
}
public class ColorBoxes2 extends Frame {
private CBoxVector[] v;
public ColorBoxes2(int pause, int grid) {
setTitle("ColorBoxes2");
setLayout(new GridLayout(grid, grid));
v = new CBoxVector[grid];
for(int i = 0; i < grid; i++)
v[i] = new CBoxVector(pause);
for (int i = 0; i < grid * grid; i++) {
v[i % grid].addElement(new CBox2());
add((CBox2)v[i % grid].lastElement());
}
for(int i = 0; i < grid; i++)
v[i].go();
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}
public static void main(String[] args) {
// Shorter default pause than ColorBoxes:
int pause = 5;
int grid = 8;
if(args.length > 0)
pause = Integer.parseInt(args[0]);
if(args.length > 1)
grid = Integer.parseInt(args[1]);
Frame f = new ColorBoxes2(pause, grid);
f.setSize(500, 400);
f.setVisible(true);
}
} ///:~ |