import java.awt.*;
import javax.swing.*;

public class Life extends JApplet {

    int rows, cols;  
    	
    public void init() {

	String input;

	input = JOptionPane.showInputDialog("Enter # of rows","20");
	rows = Integer.parseInt(input);
	
	input = JOptionPane.showInputDialog("Enter # of columns","20");
	cols = Integer.parseInt(input);

    }

    public void paint(Graphics g) {
        super.paint(g);  
        	
    	char [][] world = new char[rows][cols]; 
    	
    		world[5][5]='*';
    		world[6][5]='*';
    		world[7][5]='*';
    		world[7][6]='*';
    		world[7][7]='*';
    		world[6][7]='*';
    		world[5][7]='*';
    		  
    	int nbors;
    	
    	do {
    	
    	g.setColor(Color.WHITE);
    	g.fillRect(0,0,getWidth(),getHeight());

    	g.setColor(Color.BLACK);
     	for (int i=1; i<rows-1; i++) 
	    for (int j=1; j<cols-1; j++) 
		g.drawString(""+world[i][j],j*10,i*10);

    	char [][] nextGen = new char[rows][cols]; //recreate it each time

    	for (int i=1; i<rows-1; i++) 
	    for (int j=1; j<cols-1; j++) {

      		nbors = 0;
      		if (world[i-1][j-1] == '*') nbors++;
      		if (world[i-1][j]   == '*') nbors++;
      		if (world[i-1][j+1] == '*') nbors++;
      		if (world[i][j-1]   == '*') nbors++;
      		if (world[i][j+1]   == '*') nbors++;
      		if (world[i+1][j-1] == '*') nbors++;
      		if (world[i+1][j]   == '*') nbors++;
      		if (world[i+1][j+1] == '*') nbors++;
      		if (world[i][j]=='*')
		    if (nbors==2 || nbors==3)
	  		nextGen[i][j] = '*';
		    else
	  		nextGen[i][j] = ' ';
      		else
		    if (nbors==3)
	  		nextGen[i][j] = '*';
		    else
	  		nextGen[i][j] = ' ';
	    }

    	//copy nextGen to world
    	for (int i=1; i<rows-1; i++) 
	    for (int j=1; j<cols-1; j++) {
		world[i][j] = nextGen[i][j];
		//g.drawString(""+world[i][j],j*10,i*10);
	    }		
		
	try {
		Thread.sleep(1000);
	}
	catch (InterruptedException e) {
	}
	 
    	} while (true);  	
    }    
}