java - 无法重绘Java中的场景

Question

我正在为这个类创建这个游戏，我的代码应该可以正常工作，并且x和y正在苹果图像上更新，但是图像在屏幕上没有移动...除屏幕更新外，其他所有方法都有效，我有repaint（）;我需要的每一个地方，但它没有更新。这些都是我使用的所有方法，并且都可以正常工作，只是我的代码没有更新屏幕

    public void paintComponent(Graphics g)
    {
        super.paintComponent(g);     
        if (starting==true) {
            try   // load the images
            {
                imgMain=ImageIO.read(new File("MainMenu.png"));//Load the main menu image
                imgRules=ImageIO.read(new File("Rules.png"));//load the rules image
                imgLost=ImageIO.read(new File("LostMenu.png"));//load lost image
                imgKid=ImageIO.read(new File("Kid.png"));//load kid image
                imgBG=ImageIO.read(new File("Background.png"));//load background image
                imgApple=ImageIO.read(new File("Apple.png"));//load apple image
                imgBomb=ImageIO.read(new File("bomb.png"));//load bomb image
            }
            catch(IOException e)//if image is not found
            {
                System.out.println("could not find image");
                g.drawString("Could not find images",100,100);
            }
            starting=false;
            xBomb=(int) ((Math.random()*1100)+1);
            xApple=(int) ((Math.random()*1100)+1);
        }
        if (Scene==1)//MainMenu Image
        {
            g.drawImage(imgMain, 0,0, 1100,700,this);
            Life=5;
            Score=0;
            yApple=0;
            yBomb=0;
        }//end of MainMenu Scene
        if (Scene==2)//Rules Image
        {
            g.drawImage(imgRules, 0,0, 1100,700,this);
        }//End Of Rules Scene
        if (Scene==3)//Game Image
        {
            g.drawImage(imgBG, 0,0, 1100,700,this);//show background
            //start up values for character 
            g.drawString ("Lives = "+Life,1000,50);//Draw Lives left
            g.drawString ("Score = "+Score,900,50);//Draw  Score
            g.drawImage(imgKid, x,y, 200,200,this);//draw character
            if (Random==1)//if Random is = to bomb(2)
            {
                g.drawImage(imgBomb, xBomb,yBomb, 20,20,this);//show bomb
            }
            if (Random==2)//if Random is = to apple(1)
            {
                g.drawImage(imgApple, xApple,yApple, 20,20,this);//show apple
            }
            if(Life<=0)
            {

                Scene=4;
            }
        }//End Of Game
        if (Scene==4)//Game Image
        {
            g.drawImage(imgLost, 0,0, 1100,700,this);
        }//End Of Game
    }
    public void mouseClicked(MouseEvent e)
    {  
        Graphics g = getGraphics();
        int x=e.getX(); // get the x and y location of the mouse
        int y=e.getY();
        if (Scene==1)
        {
            if (x>=350 & x<=655 & y>=325 & y<=365)//Go To the rules
            {
                Scene=2;
                repaint();
            }
            if (x>=348 & x<=626 & y>=192 & y<=223)// go to the game
            {
                Scene=3;
                repaint();
            }
        }//end of Scene 1
        if (Scene==2)
        {
            if (x>=330 & x<=640 & y>=390 & y<=413)//go back to MainMenu
            {
                Scene=1;
                repaint();
            }
        }//end of Scene 2
        if (Scene==4)
        {
            if (x>=380 & x<=550 & y>=250 & y<=280     )//go back to MainMenu
            {
                Scene=1;
                repaint();
            }
        }//end of Scene 2
    }

    public void keyReleased(KeyEvent e) { }
    public void keyTyped(KeyEvent e) { }
    @Override
    public void keyPressed(KeyEvent e) {
        if (Scene==3)
        {
            int code = e.getKeyCode();
            switch(code)
            {
            case KeyEvent.VK_RIGHT:
                if (Score>=1500){
                    x=x+20;//slow down the character 
                }
                if (Score<1500) {
                    x=x+40;
                }   
                break;
            case KeyEvent.VK_LEFT:
                if (Score>=1500){
                    x=x-20;//slow down the character 
                }
                if (Score<1500) {
                    x=x-40;
                }
                break;
            }
        }
    }
    public void actionPerformed(ActionEvent arg0) {
        yApple++;
        yBomb++;
        if (Random==2) {
            System.out.println(xApple+ "  "+yApple);
            if (yApple>=550)//if apple hits the ground
            {
                yApple=0;//bring apple back to the top
                xApple=(int) ((Math.random()*1000)+1);//randomize new place for apple
                Random=(int) ((Math.random()*2)+1);//randomize between apple and bomb
                System.out.println(Random);
                Life=Life-1;//remove 1 life
            }
            int HitDetection;
            HitDetection = (int)Math.sqrt( Math.pow(xApple-x, 2.0)+Math.pow(yApple-y, 2.0));
            if (HitDetection<=110)//if the apple hits the kid
            {
                yApple=0;//bring apple back to the top
                xApple=(int) ((Math.random()*1000)+1);//reset apple place
                Random=(int) ((Math.random()*2)+1);//randomize between apple and bomb
                System.out.println(Random);
                Score=Score+100;//add 100 to the score
            }
        }

        if (Random==1) {    
            if (yBomb>=550)
            {
                yBomb=0;
                xBomb=(int) ((Math.random()*1000)+1);
                Random=(int) ((Math.random()*2)+1);
                System.out.println(Random);
            }
            int HitDetection2 = 0;
            HitDetection2 = (int)Math.sqrt( Math.pow(xBomb-x, 2.0)+Math.pow(yBomb-y, 2.0));
            if (HitDetection2<=110)
            {
                yBomb=0;
                xBomb=(int) ((Math.random()*1000)+1);
                Random=(int) ((Math.random()*2)+1);
                System.out.println(Random);
                Life=Life-1;
            }
            repaint();

        }
    }
}

Answer 1

您会在使用revalidate（）方法之前尝试repaint（）吗？

像这样;

revalidate();
repaint();