public class Portal extends Tile
{
    public static final String START = "AA";
    public static final String EXIT = "ZZ";

    public Portal (Coordinate position, boolean horizontalRepresentation)
    {
        super(position, TileId.PORTAL);
        
        _location = position;
        _horizontal = horizontalRepresentation;
    }

    private Coordinate _location;
    private boolean _horizontal;
}
@@ -162,40 +162,21 @@
 on, 
-boolean horizontalRepresentation
+char portalId
 )%0A  
@@ -271,45 +271,29 @@
    _
-horizontal = horizontalRepresentation
+portalName = portalId
 ;%0A  
@@ -347,26 +347,23 @@
 ate 
-boolean _horizontal
+char _portalName
 ;%0A%7D

Update Portal.java