castling

King.java

@@ -30,6 +30,30 @@ public class King extends Piece {
         positions.add(test);
       }
     }
+      int colorPos = this.color.equals("White") ? 7 : 0;
+      boolean leftOpen = true;
+      boolean rightOpen = true;
+      if (!this.hasMoved && !inCheck(board,pos)){
+        if(board.getPiece(7,colorPos) instanceof Rook && !Rook.class.cast(board.getPiece(7,colorPos)).hasMoved){
+        ArrayList<Position> right = this.slide(board,1,0,2);
+
+        for (Position p : new ArrayList<>(right)){
+          if (inCheck(board,p)){
+            rightOpen = false;
+          }
+        }
+        if (rightOpen) {positions.add(new Position(pos.x+2,pos.y));}
+        }
+        if (board.getPiece(0,colorPos) instanceof Rook && !Rook.class.cast(board.getPiece(0,colorPos)).hasMoved){
+
+          ArrayList<Position> left = this.slide(board,-1,0,2);
+        for (Position p : new ArrayList<>(left)){
+          if (inCheck(board,p)){
+            leftOpen = false;
+          }
+        }
+ if (leftOpen) positions.add(new Position(pos.x - 2, pos.y));
+      }}
 
     return positions;
   }