Refactoring: grundsätzliche Zellenüberprüfung in countAliveNeighbours()

src/Life.java

@@ -59,6 +59,10 @@ public class Life implements ILife {
   }
 
   private int countAliveNeighbours() {
-    return 3;
+    int count = 0;
+    if (isAlive(0, 0)) count++;
+    if (isAlive(0, 1)) count++;
+    if (isAlive(0, 2)) count++;
+    return count;
   }
 }