JFrame repaint（）和revalidate（）仅在Mac OS上调整窗口大小时更新

Question

I use this class for my school app projects. It is how I set the application up and it extends JFrame and implements Runnable. Now whenever I use this in school on a Windows computer and everything works and the screen updates, but at home on a Mac it doesn't. I use Eclipse neon with JDK 1.8.0_101 Please help me out, I can't test any projects at home cause of this.

import java.awt.Graphics;
import javax.swing.JFrame;

public abstract class GUIApplication extends JFrame implements Runnable{

    private Screen currentScreen;
    //no main, cant instentiate an abstract class
    public GUIApplication(){
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        int x=40;
        int y=40;
        int width=1000;
        int height=640;
        setBounds(x,y,width,height);
        initScreen();
        setVisible(true);
    }
    //this is a method for creating the starting screen
    protected abstract void initScreen();

    public void setScreen(Screen screen){
        //stop controls from previous screen
        removeListeners();

        setCurrentScreen(screen);
        //add new controls
        addListeners();
    }

    private void removeListeners(){
        if(getCurrentScreen() != null){
            if(getCurrentScreen().getMouseListener() != null)     removeMouseListener(getCurrentScreen().getMouseListener());
            if(getCurrentScreen().getMouseMotionListener() != null) removeMouseMotionListener(getCurrentScreen().getMouseMotionListener());
            if(getCurrentScreen().getKeyListener() != null) removeKeyListener(getCurrentScreen().getKeyListener());
        //      if(currentScreen.getMouseWheelListener() != null) removeMouseWheelListener(currentScreen.getMouseWheelListener());
        }
    }

    private void addListeners(){
        if(getCurrentScreen() != null){
            if(getCurrentScreen().getMouseListener() != null)addMouseListener(getCurrentScreen().getMouseListener());
            if(getCurrentScreen().getMouseMotionListener() != null) addMouseMotionListener(getCurrentScreen().getMouseMotionListener());
            if(getCurrentScreen().getKeyListener() != null){
                addKeyListener(getCurrentScreen().getKeyListener());
            }
        //      if(currentScreen.getMouseWheelListener() != null) addMouseWheelListener(currentScreen.getMouseWheelListener());
        }
    }

    public void paint(Graphics g){
        g.drawImage(getCurrentScreen().getImage(), 0, 0, null);
    }

    public void run(){
        while(true){
            getCurrentScreen().update();
            repaint();
            try {
                Thread.sleep(30);
                repaint();
                revalidate();

            } catch (InterruptedException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }
        }
    }
    public Screen getCurrentScreen() {
        return currentScreen;
    }
    public void setCurrentScreen(Screen currentScreen) {
        this.currentScreen = currentScreen;
    }

}

This is how a game would start:

import java.awt.Color;
import java.awt.Dimension;
import java.awt.Toolkit;
import java.util.ArrayList;

import javax.swing.JFrame;


import game.mainScreenTeam.Dragon;
import game.mainScreenTeam.HomeScreen;
import game.miniGameTeam.GameInstructions;
import game.miniGameTeam.GameScreen;
import game.miniGameTeam.HighScoreScreen;
import game.shopScreen.BuyScreenWendy;
import game.shopScreen.HomeShopScreen;
import game.shopScreen.SellShopZheng;

import guiPractice.GUIApplication;
import guiPractice.Screen;
import guiPractice.components.AnimatedComponent;

/**
 * @author Kat
 *
 */
public class DragonLand extends GUIApplication {

    public static DragonLand game;
    public static int coins = 1500; 
    public static HomeScreen homeScreen;
    public static Screen shopMain; // shop 1
    public static Screen sellScreen; // shop 2
    public static Screen buyScreen; // shop 3
    public static Screen highscoreScreen; // high score
    public static GameScreen miniGameScreen; // minigame
    public static Screen gameInstructionsScreen;
    public static Screen HelpScreen;
    public static Color NAVY;
    public static Color BRIGHT_PINK;
    public static Color LIGHT_PINK;
    public static Color LIGHT_NUDE;
    public static Color DARKER_NUDE;


    /**
     * 
     */
//  public static void addDragon(AnimatedComponent a){
//      dragonList.add(a);
//  }
    public DragonLand() {

    }

    /* (non-Javadoc)
     * @see guiPractice.GUIApplication#initScreen()
     */
    @Override
    protected void initScreen() {
        initColors();


        miniGameScreen = new GameScreen(getWidth(),getHeight());
        shopMain = new HomeShopScreen(getWidth(),getHeight());
        sellScreen = new SellShopZheng(getWidth(),getHeight());
        homeScreen = new HomeScreen(getWidth(),getHeight());
        buyScreen = new BuyScreenWendy(getWidth(),getHeight());
        highscoreScreen = new HighScoreScreen(getWidth(),getHeight());
        HomeScreen.jenCode = new game.mainScreenTeam.HomeJenniber();
        gameInstructionsScreen = new GameInstructions(getWidth(), getHeight());

        setScreen(homeScreen);


    }
    private void initColors() {
        NAVY = new Color(62,74,99);
        BRIGHT_PINK = new Color(224,102,102);
        LIGHT_PINK = new Color(248,186,182);
        LIGHT_NUDE = new Color(244,215,183);
        DARKER_NUDE = new Color(230,195,147);
    }

    /**
     * @param args
     */
    public static void main(String[] args) {
        game = new DragonLand();
        Thread go = new Thread(game);
        go.start();
    }

    //public coin getter + setter
        public void setCoins(int x){
            coins = x;
        }
        public int getCoins(){
            return coins;
        }

}

This is the home screen

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.util.ArrayList;

import javax.swing.ImageIcon;

import game.DragonLand;
import guiPractice.ClickableScreen;
import guiPractice.components.Action;
import guiPractice.components.AnimatedComponent;
import guiPractice.components.Button;
import guiPractice.components.Graphic;
import guiPractice.components.TextLabel;
import guiPractice.components.Visible;
import guiPractice.sampleGames.MouseFollower;

/**
 * @author Kat 
 * @author Jenniber
 *
 */
public class HomeScreen extends ClickableScreen implements Runnable{

    private Graphic background;
    public static HomeJenniber jenCode;

    public HomeScreen(int width, int height) {
        super(width, height);
        Thread play = new Thread(this);
        play.start();

    }

    @Override
    public void initAllObjects(ArrayList<Visible> viewObjects) {

        background=new Graphic(0,0,getWidth(),getHeight(),"img/Grassland.png");
        viewObjects.add(background);
        HomeKat katCode=new HomeKat(viewObjects, getWidth(), getHeight());

    }


    @Override
    public void run() {
    }

}

katCode adds buttons to the screen and image annimations

Answer 1

public void paint(Graphics g){
    g.drawImage(getCurrentScreen().getImage(), 0, 0, null);
}

Don't override paint() on a JFrame.

The proper way to do custom painting is to override paintComponent(...) on a JPanel (or JComponent) and then you can set the content pane of the frame to this panel. And don't forget to invoke super.paintComponent(...) as the first statement in the method. Read the section from the Swing tutorial on Custom Painting for more information and working examples.

However if you do get lazy, then at minimum you need to invoke super.paint (...) as the first statement in the paint(...) method.

Also, I doubt you need the revalidate(), since you don't appear to be adding/removing components from the frame.

But in general the order should be:

revalidate(); // to invoke the layout manager
repaint(); // paint components in new location.

I also don't know why you are invoking the update() method. That seems like old AWT code which you don't use in Swing. I suggest you take a look at the tutorial link I gave you and look at the table of contents for other Swing basics.