java - Expected red rectangle in frame, see nothing -


here's code:

class aa

package com.mahbonnets.game;  import javax.swing.*;  public class aa {  public static ab f = new ab(); public static int width = 600; public static int height = 400; public static void main(string args[]) {         f.setsize(width, height);         f.setresizable(false);         f.setvisible(true);         f.setdefaultcloseoperation(jframe.exit_on_close);         f.settitle("mah bonnets gone");         f.setlocationrelativeto(null);         system.out.println("running!!"); } }

ab

package com.mahbonnets.game;  import java.awt.gridlayout; import javax.swing.*;  public class ab extends jframe {  public ac panel;  public ab() {     panel = new ac(this);     setlayout(new gridlayout (1, 1, 0, 0));     add(panel); } }

and ac

package com.mahbonnets.game;  import java.awt.color; import java.awt.graphics; import java.awt.rectangle;  import javax.swing.*;  public class ac extends jpanel implements runnable { public rectangle floor;  public int floorheight = 80; public int fps = 1000;  public boolean objectdefine = false;  public thread game; public ac(ab f) {     setbackground(color.black);      defineobjects();      game = new thread(this);     game.start(); }  void defineobjects() {         floor = new rectangle(-10, aa.height-floorheight, aa.width+10, floorheight);         objectdefine = true;         repaint(); }  public void paint(graphics g) {     super.paint(g);      if(objectdefine) {         g.setcolor(color.red);         g.fillrect(floor.x, floor.y, floor.width, floor.height); } }   public void fpssetter() { try{     thread.sleep(fps/1000);  }catch(exception e) {     e.printstacktrace();          }    }   @override   public void run(){       // todo auto-generated method stub   } }

what isn't happening that's supposed happening red rectangle supposed appear @ bottom of jframe. i'm entirely new programming, i've looked on section of code pertaining rectangle , looks in order... @ least... far can tell.

if have idea what's wrong please me out. thanks.

here's youtube tutorial i've been following http://www.youtube.com/watch?v=0lfhckair-8

  1. don't rely on magic numbers...
  2. don't rely on parameters may not match reality (public static int width = 600 isn't going same size child component). use getwidth , getheight actual size of component...
  3. get rid of defineobjects , rely on known states of component
  4. get rid of paint method , use paintcomponent instead
  5. static not friend
  6. don't use youtube reference, unless poster has references ;)
  7. do read performing custom painting
  8. do read painting in awt , swing
  9. do read concurrency in swing

replace paint method more this...

@override protected void paintcomponent(graphics g) {     super.paintcomponent(g); //to change body of generated methods, choose tools | templates.      int x = -10;     int y = getheight() - floorheight;     int width = getwidth() + 10;     int height = floorheight;     floor = new rectangle(x, y, width, height);     g.setcolor(color.red);     g.fillrect(floor.x, floor.y, floor.width, floor.height); }

and thread.sleep(1000 / 1000) close no sleep makes no difference ;) - 25fps rough 40 milliseconds ;)


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