Java Swing Interface Troubles -

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this strangest bug i've ever encountered. whenever start program, in 1 of 2 times, gui created , pop-ups. in other 1 out of 2 times, no gui, no error , code executed in same order whenever gui created.

what causing bug? , how resolve this? i'm clueless..

the view class :

    package view;  import controller.gamecontroller; import lombok.data; import model.gamemodel;  import javax.swing.*; import java.awt.event.actionevent; import java.awt.event.actionlistener;      @data public class view extends jframe {          gameinterface gameinterface = new gameinterface();         mainmenuscreen menuscreen = new mainmenuscreen();          public view() {             super("view");             setdefaultcloseoperation(windowconstants.exit_on_close);             displaymenuscreen();             setvisible(true);         }          public void displaymenuscreen(){             menuscreen.getstartthegamebutton().addactionlistener(new actionlistener() {                 @override                 public void actionperformed(actionevent e) {                     gamemodel.getinstance().newgame();                     displaygameinterface();                     gamecontroller.startgame();                 }             });             setcontentpane(menuscreen.getcontentpane());         }          public void displaygameinterface(){             setcontentpane(gameinterface.getcontentpane());         }     }

the main menu class:

package view; import lombok.data; import javax.swing.*;  @data public class mainmenuscreen extends jframe{     private jbutton startthegamebutton;     private jpanel rootpanelmainmenu;     private jtextpane crazybananarepublictycoontextpane;      public mainmenuscreen() {         super("my game's name");         setdefaultcloseoperation(windowconstants.exit_on_close);         setcontentpane(rootpanelmainmenu);         system.out.println("heyhey3");      } }

the class view created: 

import model.gamemodel; import model.gamemodelobserver; import view.view;  public class crazybananarepublictycoon {          public static final void main(string args[]){             view view = new view();             view.setvisible(true);             gamemodelobserver gamemodelobserver = new gamemodelobserver(view.getgameinterface());             gamemodel.getinstance().addobserver(gamemodelobserver);             gamemodel.getinstance().setgamemodelobserver(gamemodelobserver);         }     }

you not using event dispatch thread...

you must interact swing/awt objects via edt.

change main method:

public static final void main(string args[])  {     eventqueue.invokelater(new runnable() {         public void run() {             view view = new view();             view.setvisible(true);             gamemodelobserver gamemodelobserver = new gamemodelobserver(view.getgameinterface());             gamemodel.getinstance().addobserver(gamemodelobserver);             gamemodel.getinstance().setgamemodelobserver(gamemodelobserver);         }     } }

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