java - Label gets added to JPanel without reason swing -

i'm trying make simple application painting. have main method sets jframe, , adds jpanel , jlabel using flowlayout. jlabel counting clicks.

the panel class implements mouselistener , mousemotionlistener.

the problem when paint or click on panel, adds label jpanel aswell, , depending on click, can add twice panel, it's making me mad. can't understand why it's added jpanel.

also, jpanel surrounded border, , when click or paint adds new vertical borderline somewhere on panel, it's random every time.

code 2 classes:

public class mainepanel extends jpanel implements  mousemotionlistener, mouselistener{  graphics globalgraphics; int clickcount = 0;  public mainepanel(){     setborder(borderfactory.createlineborder(color.black));     setpreferredsize(new dimensionuiresource(200,200));     addmousemotionlistener(this);     addmouselistener(this);     validate();     setfocusable(true); }  public void paintcomponent(graphics g){     globalgraphics = g.create(); }  @override public void mousedragged(mouseevent e) {     globalgraphics.filloval(e.getx(), e.gety(), 10,10);     repaint(); }  @override public void mouseclicked(mouseevent e) {     clickcount ++;     maine.setlabel(clickcount);     globalgraphics.filloval(e.getx(), e.gety(), 10,10);     repaint(); } 

maine

public class maine extends jframe{ static jlabel label;  public maine(){     setsize(600,400);     setdefaultcloseoperation(3);     setresizable(false);      label = new jlabel("clicks:");     setlayout(new flowlayout());     add(label);     add(new mainepanel());     setvisible(true); }  public static void setlabel(int clicks){     label.settext("clicks: " + clicks); }  public static void main(string[]args){     new maine(); } } 

perform drawing within paintcomponent (and sure call super.paintcomponent) - mouselistener/mousemotionlistener should need change data model (and if necessary call repaint ui reflects change).

a simple example below single circle created mouse click, , moved mouse dragged:

point center = null; ... @override public void mouseclicked(mouseevent e){     center = e.getpoint();     repaint(); } @override public void mousedragged(mouseevent e){     center = e.getpoint();     repaint(); } @override protected void paintcomponent(graphics g){     super.paintcomponent(g);     if ( center != null ){         g.filloval(center.getx(), center.gety(), 10, 10);     } }