public class JavaLife {

/**

*

* @param size Size of world

* @param seed Random number seed

* @param percent Percent of cells alive at beginning

* @param maxIterations Maximum number of iterations

*/

public JavaLife(int size, int seed, int percent, int maxIterations) {

World w = new World(size, seed, percent);

System.out.println("Initial Configuration:");

System.out.println(w.toString());

for (int j=0; j < maxIterations; j++) {

w = w.iterate();

System.out.println("Iteration " + (j + 1) + ":");

System.out.println(w.toString());

}

}

/**

* String to display if wrong number of arguments or other unspecified error

* when reading command line arguments.

* @return String to display

*/

private static String getErrMessage() {

return "Requires four args: <size> <seed> <percent> <max iterations>";

}

/**

* String to display if command line args are not formatted properly.

* @return String to display

*/

private static String getNumFormatMessage() {

return "Please enter four positive integers for the arguments.";

}

/**

* MAIN

* @param args Command line arguments

* [0] -> Size of world

* [1] -> Random number seed

* [2] -> Percent of cells alive

* [3] -> Maximum number of iterations

*/

public static void main(String[] args) {

if (args.length != 4) {

System.err.println(getErrMessage());

System.exit(1);

}

int size = 0, seed = 0, percent = 0, maxIterations = 0;

try {

size = Integer.parseInt(args[0]);

seed = Integer.parseInt(args[1]);

percent = Integer.parseInt(args[2]);

maxIterations = Integer.parseInt(args[3]);

if (size < 0 || seed < 0 || percent < 0 || maxIterations < 0) {

throw (new NumberFormatException());

}

} catch (NumberFormatException nfex) {

System.err.println(getNumFormatMessage());

System.exit(1);

}

JavaLife jl = new JavaLife(size, seed, percent, maxIterations);

}

}