如何使用Swing JPanel在Java中强制重新绘制？

为什么不为一个简单的动画重新绘制我的图像？我从两个不同的方法调用repaint（），其中一个导致repaint，但另一个没有。强制重新绘制的方法是从事件侦听器生成的。没有的是定时动画线程。我知道动画线程正在正确运行，只要我不断滑动滑块，它就会完美地显示。救命啊
是的，我在这里看到了许多类似的问题，我尝试过验证、重新验证以及使用paint vs paintComponent。构成代码的四个类如下所示：

import javax.swing.*;

public class gutz{

    public static int windowWidth = 640;
    public static int windowHeight = 480;

    public static void main(String[] args){

        hBod hb1 = new hBod(50, 30, 21, 111, 7, -11);   //mass, radius, xpos, ypos, xvel, yvel
        Thread t1 = new Thread(hb1);

        windowmakr w = new windowmakr();
        w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        w.setSize(windowWidth, windowHeight);
        w.setVisible(true);

        t1.start();
    }
}

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

public class windowmakr extends JFrame {

    private JSlider slider;
    private drawr panel;

    public windowmakr(){
        super("Orbit Explorer");
        panel = new drawr();
        panel.setBackground(Color.BLACK);

        slider = new JSlider(SwingConstants.HORIZONTAL, 0, 200, 10);
        slider.setMajorTickSpacing(10);
        slider.setPaintTicks(true);

        slider.addChangeListener(
                new ChangeListener(){
                    public void stateChanged(ChangeEvent e){
                        panel.setSpeed(slider.getValue());
                    }
                }
        );

        add(slider, BorderLayout.SOUTH);
        add(panel, BorderLayout.CENTER);

    }

}

import java.awt.*;
import javax.swing.*;

public class drawr extends JPanel{

    private int diameter = 10;
    private static int rad;
    private static int xpos;
    private static int ypos;

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.ORANGE);
        g.fillOval((gutz.windowWidth-diameter)/2, ((gutz.windowHeight-diameter)/2)-40, diameter, diameter);
        g.setColor(Color.CYAN);
        g.fillOval(xpos, ypos, rad, rad);

    }

/*  public void paint(Graphics g){
        super.paint(g);
        g.setColor(Color.ORANGE);
        g.fillOval((gutz.windowWidth-diameter)/2, ((gutz.windowHeight-diameter)/2)-40, diameter, diameter);
        g.setColor(Color.CYAN);
        g.fillOval(xpos, ypos, rad, rad);   
    }
*/  
    public void setSpeed(int newD){
        diameter = (newD >= 0 ? newD : 10);
        repaint();
    }

    public void renderImage(int r, int xp, int yp){
        rad=r;
        xpos=xp;
        ypos=yp;
        repaint();
    }

    public Dimension getPreferredSize(){
        return new Dimension(200,200);
    }

    public Dimension getMinimumSize(){
        return getPreferredSize();
    }
}

public class hBod implements Runnable{

    private int mass;
    private int rad;
    private int xpos;
    private int ypos;
    private double xvel;
    private double yvel;

    public drawr render;

    public hBod(int m, int r, int xp, int yp, double xv, double yv){
        mass=m;
        rad=r;
        xpos=xp;
        ypos=yp;
        xvel=xv;
        yvel=yv;

        render = new drawr();
    }

    public void run(){
        try{
            while(true){
                xpos+=xvel;
                ypos+=yvel;
                yvel+=1;
                System.out.printf("rad - %d, xpos - %d, ypos - %d\n", rad, xpos, ypos);
                render.renderImage(rad, xpos, ypos);

                Thread.sleep(1000);
            }
        }catch(Exception e){}
    }
}

---

正如我前面所说，问题在于这行

render=newdrawr（）在
hBod
构造函数内。在
gutz
类中创建单个实例，如
private drawr panel=new drawr（）
，并使用其构造函数将其传递给其他两个类，如
hBod hb1=new hBod（50,30,21,111,7，-11，panel）
和
windowmakr w=new windowmakr（panel）
并简单地使用此引用指向
面板。渲染（…）
内部
hBod
类和
面板。设置速度（…）
来自
windowmakr
类

以下是修改后的代码，请学习Java编码约定：

import java.awt.*;
import javax.swing.*;
import javax.swing.event.*;

public class Gutz {

    public static int windowWidth = 640;
    public static int windowHeight = 480;

    public static void main(String[] args){
        Drawr panel = new Drawr();
        panel.setBackground(Color.BLACK);
        HBod hb1 = new HBod(50, 30, 21, 111, 7, -11, panel);   //mass, radius, xpos, ypos, xvel, yvel
        Thread t1 = new Thread(hb1);

        WindowMakr w = new WindowMakr(panel);
        w.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        w.setSize(windowWidth, windowHeight);
        w.setVisible(true);

        t1.start();
    }
}

class WindowMakr extends JFrame {

    private JSlider slider;
    private Drawr panel;    

    public WindowMakr(Drawr p){
        super("Orbit Explorer");
        final Drawr panel = p;        

        slider = new JSlider(SwingConstants.HORIZONTAL, 0, 200, 10);
        slider.setMajorTickSpacing(10);
        slider.setPaintTicks(true);

        slider.addChangeListener(
                new ChangeListener(){
                    public void stateChanged(ChangeEvent e){
                        panel.setSpeed(slider.getValue());
                    }
                }
        );

        add(slider, BorderLayout.SOUTH);
        add(panel, BorderLayout.CENTER);

    }

}

class Drawr extends JPanel{

    private int diameter = 10;
    private static int rad;
    private static int xpos;
    private static int ypos;

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        g.setColor(Color.ORANGE);
        g.fillOval((Gutz.windowWidth-diameter)/2, ((Gutz.windowHeight-diameter)/2)-40, diameter, diameter);
        g.setColor(Color.CYAN);
        g.fillOval(xpos, ypos, rad, rad);

    }

    public void setSpeed(int newD){
        diameter = (newD >= 0 ? newD : 10);
        repaint();
    }

    public void renderImage(int r, int xp, int yp){
        rad=r;
        xpos=xp;
        ypos=yp;
        repaint();
    }

    public Dimension getPreferredSize(){
        return new Dimension(200,200);
    }

    public Dimension getMinimumSize(){
        return getPreferredSize();
    }
}

class HBod implements Runnable{

    private int mass;
    private int rad;
    private int xpos;
    private int ypos;
    private double xvel;
    private double yvel;

    public Drawr render;

    public HBod(int m, int r, int xp, int yp, double xv, double yv, Drawr panel){
        mass=m;
        rad=r;
        xpos=xp;
        ypos=yp;
        xvel=xv;
        yvel=yv;

        render = panel;
    }

    public void run(){
        try{
            while(true){
                xpos+=xvel;
                ypos+=yvel;
                yvel+=1;
                System.out.printf("rad - %d, xpos - %d, ypos - %d\n", rad, xpos, ypos);
                render.renderImage(rad, xpos, ypos);

                Thread.sleep(1000);
            }
        }catch(Exception e){}
    }
}

您可以在JFrame类中使用getContentPane（）.repaint（）方法
您是否尝试过使用
SwingUtilities调用
repaint
调用（从动画线程）。invokeLater
因为Swing/AWT不是线程安全的？为了更快地获得更好的帮助，即使我找不到重复的，这类问题已经被回答了好几次了：用fast，发布的代码是如何成为SSCCE的？代码可以编译吗？为了它的价值，JComponent重绘方法应该是线程安全的。太酷了！！！非常感谢。（我正在使用jAVA编码约定。但是进展很慢。就像我说的：我只是一个穴居人！再次感谢大家。但是，我想请你们稍微改变一下逻辑，而不是使用
线程来重复一项任务，试着使用线程来完成这项任务，如图所示。请随意问任何问题，这仍然不清楚。对于别客气，保持微笑：-）我要离开几天，回来后再试试。（忍不住笑了；这真的很有趣！）仅供参考——我试图比较前后的差异，但您对JAVa编码约定所做的所有更改都受到了干扰。最后我不得不取消你所有的额外工作效果很好。即使没有SwingUtilities.invokeLater的环绕。。。