Version 7

At this point we add all the code for the original (non-applet) Life game. There are a huge number of changes just to get all the accesses to work. There are not, however, any fundamentally new ideas involved. The "Step" button now makes the Life board advance one step.

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Source code:

import java.awt.*;
import java.applet.Applet;
import java.awt.event.*;    // needed for ActionListener

public class Life extends Applet
{
  static int boardSize = 10;
  Cell [][] board;
  Cell [][] nextBoard;
  Button stepButton;
  MyCanvas canvas;

  /**
   * Creates an empty (all cells dead) playing board of the given boardSize.
   */
  static Cell[][] emptyBoard (int boardSize)
  {
    Cell[][] result = new Cell[boardSize][boardSize];

    for (int i = 0; i  limit) continue;
	if (jj <0 || jj> limit) continue;
	if (board[ii][jj].getAlive ()) count++;
      }
    return count;
  }
}