update

src/main/java/Snake/Snake.java

@@ -30,4 +30,59 @@ public class Snake {
         bodySegments.add(new Point(gridSize/2, gridSize/2 + 2));
     }
 
+    public void update()
+    {
+        for (int i = bodySegments.size() - 1; i > 0; --i)
+        {
+            bodySegments.set(i, (Point)bodySegments.get(i - 1).clone());
+        }
+
+        Point headPosition = bodySegments.get(0);
+        switch (direction)
+        {
+            case UP:
+                headPosition.setLocation(headPosition.getX(), headPosition.getY() - 1);
+                break;
+            case RIGHT:
+                headPosition.setLocation(headPosition.getX() + 1, headPosition.getY());
+                break;
+            case DOWN:
+                headPosition.setLocation(headPosition.getX(), headPosition.getY() + 1);
+                break;
+            case LEFT:
+                headPosition.setLocation(headPosition.getX() - 1, headPosition.getY());
+                break;
+            default:
+                break;
+        }
+
+        if(headPosition.getX() >= gridSize)
+            headPosition.setLocation(0, headPosition.getY());
+        else if(headPosition.getX() < 0)
+            headPosition.setLocation(gridSize - 1, headPosition.getY());
+
+        if(headPosition.getY() >= gridSize)
+            headPosition.setLocation(headPosition.getX(), 0);
+        else if(headPosition.getY() < 0)
+            headPosition.setLocation(headPosition.getX(), gridSize - 1);
+    }
+
+    public void grow()
+    {
+        bodySegments.add((Point)bodySegments.get(bodySegments.size() - 1).clone());
+    }
+
+    public Point getHeadPosition()
+    {
+        return bodySegments.get(0);
+    }
+
+    public ArrayList<Point> getBodySegments()
+    {
+        return bodySegments;
+    }
+
+
+
+
 }