java - drawLine won't show up -


hi i'm halfway through simple gui , can't seem figure out why drawlines etc not drawing onto page. want draw intersecting lines onto drawingpanel before adding slider adjust lines intersect, can't seem them show. i'm new java, , code not quite complete appreciated! thanks

jpanel

package jpanel; import java.awt.*; import javax.swing.*;  public class jpanel {      public static void main(string[] args) {          jframe frame = new jframe("gui design");  frame.setdefaultcloseoperation (jframe.exit_on_close); boxlayout layout = new boxlayout (frame.getcontentpane(), boxlayout.x_axis); frame.setlayout(layout);   jpanel drawingpanel = new jpanel(); jpanel controlpanel = new jpanel();  controlpanel.setbackground (color.white); controlpanel.setpreferredsize (new dimension (200, 500)); drawingpanel.setpreferredsize (new dimension (500, 500)); frame.setsize(700,500);  jlabel label1 = new jlabel ("quadrant"); jlabel label2 = new jlabel ("x: " + x + ", y: " + y); double x=0; double y=0;  jslider slide = new jslider(); slide.setorientation(swingconstants.horizontal); slide.setminimum(1); slide.setmaximum(4);  controlpanel.add (label1); controlpanel.add (slide); controlpanel.add (label2);  frame.getcontentpane().add(drawingpanel); frame.getcontentpane().add(controlpanel); frame.pack(); frame.setvisible(true);      }  }

drawingpanel

package drawingpanel; import javax.swing.*; import java.awt.*; import java.util.*;  public class drawingpanel extends jpanel {       public void paint (graphics page) {         super.paintcomponent (page);         page.drawline(10, 10, 180, 300);        //i have tried messing around can't draw.        //super.paintcomponent returns 'cannot find symbol' error        //which confused about. code imcomplete      } }


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