castling

Chess.java

@@ -103,8 +103,11 @@ public class Chess extends JPanel implements ActionListener, MouseListener {
     }
     // if selecting a blank square -- must have one of ours selected
     else if (selected != null && selected.color.equals(turnColor) && legalMoves.contains(pos)) {
-
-      board.move(selected, pos);
+      if (selected instanceof King && Math.abs(pos.x - selected.pos.x) == 2) {
+        board.castle((King) selected, pos.x > selected.pos.x);
+      } else {
+        board.move(selected, pos);
+      }
       selected = null;
       legalMoves = null;
       turnColor = turnColor.equals("White") ? "Black" : "White";