implémentation de la méthode boolean calculateNextState

Grid.java

@@ -99,7 +99,11 @@ public class Grid implements Iterable<Cell> {
     }
 
     private boolean calculateNextState(int rowIndex, int columnIndex, Cell cell) {
-	return false;
+        int aliveNeighbours = countAliveNeighbours(rowIndex, columnIndex);
+        if (cell.isAlive()) {
+            return aliveNeighbours > 1 && aliveNeighbours < 4;
+        }
+        return aliveNeighbours == 3;
     }
 
     private int countAliveNeighbours(int rowIndex, int columnIndex) {