Java Swing接口问题

Question

This is the strangest bug I've ever encountered. Whenever I start my program, in about 1 of 2 times, the gui is successfully created and pop-ups. In the other 1 out of 2 times, I get no gui, I get no error and all the code is executed in the same order as whenever the gui is successfully created.

What is causing this bug? And how could I 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 where the view is 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);
        }
    }

Answer 1

You are not properly using the Event Dispatch Thread...

You must only interact with most Swing/AWT objects via the EDT.

Change your 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);
        }
    }
}