swing - erasing dots from map pacman java -

i'm coding pacman, have pacman move, loading map txt, , collision walls. next step dot eraser when pacman on dot field. need suggestion how it, i've tried erase paiting dot @ same color background, doesnt work. here code

board.java

public class board extends jpanel implements actionlistener {      private timer timer;     private map m;     private player p;      public board(){         m = new map();         p = new player();         addkeylistener(new klawa());         setbackground(color.black);         setfocusable(true);         timer = new timer(25, this);         timer.start();     }      @override     public void paint(graphics g){         super.paint(g);      for(int x=0; x<14; x++){         for(int y=0; y<14; y++){             if(m.getmap(x,y).equals("s")){                 g.drawimage(m.getwall(),x *32,y *32, this);             }             if(m.getmap(x,y).equals("k")){                 g.drawimage(m.getdot(),x *32,y *32, this);             }                          }     }      g.drawimage(p.getplayer(),p.gettilex()* 32 ,p.gettiley() * 32,null);      }      public void erase(graphics g){     super.paint(g);         if(m.getmap(p.gettilex(),p.gettiley()).equals("k")){                         g.drawimage(m.geterase(),p.gettilex(),p.gettiley(), this);         }     }                    public class klawa extends keyadapter {          @override         public void keypressed(keyevent e){             int keycode = e.getkeycode();              if (keycode == keyevent.vk_w){                 if(!m.getmap(p.gettilex(),p.gettiley() - 1).equals("s")){                                         p.move(0, -1);                                       }                 }                        if (keycode == keyevent.vk_s){                 if(!m.getmap(p.gettilex(),p.gettiley() + 1).equals("s")){                     p.move(0, 1);                 }             }             if (keycode == keyevent.vk_a){                 if(!m.getmap(p.gettilex() - 1,p.gettiley()).equals("s")){                                                        p.move(-1, 0);                 }             }             if (keycode == keyevent.vk_d){                 if(!m.getmap(p.gettilex() + 1,p.gettiley() ).equals("s")){                 p.move(1, 0);                   }             }                                 }         public void keyrelased(keyevent e){          }         @override         public void keytyped(keyevent e){          }       }     @override     public void actionperformed(actionevent e) {         repaint();     } } 

map.java

public class map {      private scanner m;     private string map[] = new string[16];     private image wall, dot, erase;      public map(){         wall = new imageicon("c:\\users\\kotek\\desktop\\pacman\\sciana.png").getimage();        dot = new imageicon("c:\\users\\kotek\\desktop\\pacman\\kropka.png").getimage();        erase = new imageicon("c:\\users\\kotek\\desktop\\pacman\\wymaz.png").getimage();        openfile();        readfile();        closefile();     }      public image getwall(){         return wall;     }      public image getdot(){         return dot;     }      public image geterase(){         return erase;     }       public string getmap(int x, int y){        string index = map[y].substring(x, x+1);        return index;          }      public void openfile(){        try{            m = new scanner(new file("c:\\users\\kotek\\desktop\\pacman\\mapa.txt"));        }catch(filenotfoundexception e){            system.out.println("blad podczas ladowania mapy");        }     }     public void readfile(){        while(m.hasnext()){            for(int i=0; i<14; i++){                map[i] = m.next();            }        }     }     public void closefile(){        m.close();     }  } 

in class map should implement method

public void setmap(int x, int y, string  value ){    //remove "k" string } 

in erase() method clean model's cell , call repaint()