java - Why will nothing paint on my screen? -

i working on 2d platformer using swing in java, , developing framework game. testing reapaint() , draw functions, not function , clueless. here code:

window.java

import javax.swing.jframe; import javax.swing.swingutilities;  public class window extends jframe {  public window() {      this.setdefaultcloseoperation(exit_on_close);     this.setsize(1000, 1000);     this.setvisible(true);     this.settitle("infiltrator");     this.setlocationrelativeto(null);     this.setcontentpane(new framework()); }  public static void main(string[] args) {     swingutilities.invokelater(new runnable()      {      @override     public void run()      { new window(); }      }                                              );  }      } 

panel.java

import java.awt.graphics; import java.awt.graphics2d;  import javax.swing.jpanel;  public abstract class panel extends jpanel {  public panel() {  this.setdoublebuffered(true); this.setfocusable(true);  /*  *  if(false) {     bufferedimage blankcursorimg = new bufferedimage(16, 16, bufferedimage.type_int_argb);     cursor blankcursor = toolkit.getdefaulttoolkit().createcustomcursor(blankcursorimg, new point(0, 0), null);     this.setcursor(blankcursor); } * */ }  public static void draw(graphics2d g2d) {  }  @override public void paintcomponent(graphics g) { graphics2d g2d = (graphics2d)g;         super.paintcomponent(g2d);         framework.draw(g2d);     }  } 

framework.java

import java.awt.color; import java.awt.graphics2d;  import javax.swing.jframe;  public class framework extends panel {  private static long begintime, takentime, sleeptime; private static long secinnano = 1000000000l; private static long secinmilli = 1000000l; private static long fps = 60l; private static long fpstime = secinnano / fps;  public static enum gamestate {starting, mainmenu, playing, over}; public static gamestate gamestate;  public framework () {     super();      thread gamethread = new thread() {         @override         public void run(){             mainloop();         }     };      gamestate = gamestate.starting;      gamethread.start(); }  private void mainloop() {      while (gamestate != gamestate.over) {          begintime = system.nanotime();          switch (gamestate) {             case starting:                   loadandinit();                 break;             case mainmenu:                  mainmenu.update();                 break;             case playing:                   break;             default:                 system.out.println("ok, messed up.");                 break;          }          repaint();          takentime = system.nanotime() - begintime;         sleeptime = (fpstime - takentime) / secinmilli;         if (sleeptime < 10)             sleeptime = 10;          try {             thread.sleep(sleeptime);         } catch (interruptedexception ex) { }       }   }    private static void loadandinit() {      gamestate = gamestate.mainmenu; }   public static void draw(graphics2d g2d) {          g2d.setcolor(color.black);         g2d.drawstring("dearp", 0, 0); } 

}

you're adding instance of framework window, framework doesn't override paintcompontents. has static draw method called panel, never create instance of panel.

you convert draw method paintcomponent(), , delete you're panel class.

also should not start thread inside constructor framework. can cause run method see incorrect values member variables. create new start method starts thread.