public class GameOfLife {
	private boolean[][] arr;
	public GameOfLife(int colunms, int rows) {
		this.arr = new boolean[colunms][rows];
	}
	public void setCellAlive(int colunm, int row) {
		arr[colunm][row] = true;
	}

	public void setCellDead(int colunm, int row) {
		arr[colunm][row] = false;
	}

	public void execCycle() {
		boolean[][] deaths = new boolean[arr.length][arr[arr.length-1].length];
		for (int colunm = 0; colunm < arr.length; colunm++) {
			for (int row = 0; row < arr[colunm].length; row++) {
				int livingNeighbors = 0;
				if(row >= 1 && arr[colunm][row-1]) livingNeighbors+=1;
				if(row <= arr[colunm].length-2 && arr[colunm][row+1]) livingNeighbors+=1;
				if(colunm >= 1 && arr[colunm-1][row]) livingNeighbors+=1;
				if(colunm <= arr.length-2 && arr[colunm+1][row]) livingNeighbors+=1;
				if(arr[colunm][row]) {
					if (livingNeighbors < 2) {
						deaths[colunm][row] = false;
					}
					if(livingNeighbors > 3){
						deaths[colunm][row] = false;
					}
				}else{
					if(livingNeighbors == 3){
						deaths[colunm][row] = true;
					}
				}

			}
			for (int colunm2 = 0; colunm2 < deaths.length; colunm2++) {
				for (int row2 = 0; row2 < deaths[colunm].length; row2++) {
					arr[colunm2][row2] = arr[colunm2][row2];
				}
			}
		}

	}
	public void show() {
		StringBuffer buffer = new StringBuffer();
		for (int colunm = 0; colunm < arr.length; colunm++) {
			for (int row = 0; row < arr[colunm].length; row++) {
				if (arr[colunm][row]) {
					buffer.append(".  ");
				} else {
					buffer.append("X  ");
				}
				if (row == arr[colunm].length - 1) {
					buffer.append("\n");
				}
			}
		}
		System.out.print(buffer.toString());

	}
}