java - Why can't I paint on the panel -


i have made 3 panels south, east , north, trying draw circle on north panel can't figure out why not drawing. here code: want small application draws circles of different sizes , colors chosen user.

import com.sun.prism.shader.drawcircle_color_loader;  import javax.swing.*; import javax.swing.event.changeevent; import javax.swing.event.changelistener; import java.awt.*; import java.awt.event.mouseevent; import java.awt.event.mouselistener;   public class drawing extends jframe implements mouselistener{     private int r = 255, g = 0, b = 0;    private jslider colorslider, redslider,greenslider,blueslider;    private jlabel colorlabel,redlabel,greenlabel,bluelabel;    private int x = 50;    private int y = 50;   public drawing(){     jframe frame = new jframe("drawing app");     frame.setdefaultcloseoperation(windowconstants.exit_on_close);     frame.setsize(800,800);      container contentpane = frame.getcontentpane();       jmenubar mb = new jmenubar();     frame.setjmenubar(mb);      jmenu color = new jmenu("colour");     jmenu size = new jmenu("size");      mb.add(color);     mb.add(size);     jmenuitem colorred = new jmenuitem("red");     jmenuitem colorblue = new jmenuitem("blue");     jmenuitem colorgreen = new jmenuitem("green");     color.add(colorblue);     color.add(colorgreen);     color.add(colorred);      jmenuitem 1 = new jmenuitem("1");     jmenuitem 2 = new jmenuitem("2");     jmenuitem 3 = new jmenuitem("3");     jmenuitem 4 = new jmenuitem("4");     jmenuitem 5 = new jmenuitem("5");     size.add(one);     size.add(two);     size.add(three);     size.add(four);      jpanel panel = new jpanel();     setbackground(color.white);     contentpane.add(panel,borderlayout.north);      jpanel panel1 = new jpanel();     contentpane.add(panel1,borderlayout.south);      jpanel panel2 = new jpanel();     contentpane.add(panel2,borderlayout.east);      panel1.setlayout(new gridlayout(0,1));     jcolorchooser colors = new jcolorchooser();     panel1.add(colors);     frame.setvisible(true);      panel.add(panel);     }    public void paint(graphics g)    {      g.setcolor(color.red);      g.filloval(x,y,100,100);    }   public void mousepressed(mouseevent e) {}   public void mousereleased(mouseevent e) {}   public void mouseentered(mouseevent e) {}   public void mouseexited(mouseevent e) {}    public void mouseclicked(mouseevent e) {      x = e.getx();      y = e.gety();      repaint();    }   public static void main(string[] args) {      drawing drawing = new drawing();   }

}

you created instance of jframe inside constructor drawing()

  1. remove instance , replace initialization inside constructor.
  2. add super.paint(g); first line of public void paint(graphics g) method.

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