我正在尝试使用Runnable和.sleep使我的JFrame绘图具有动画效果，无法正常工作

问题描述

我递归地绘制了FernFractal，我想使蕨类在代码运行时看起来像是在动画。

public void run() {
        try {
            while(true) {
                componentsDrawn = 0;
                componentsToDraw++;
                this.repaint();
                for (int i = 0; i < FractalTester.speed; i++) {
                    Thread.sleep(100);
                }
            }
        }
        catch (InterruptedException e) {}
    }

^上面是我当前的代码，该代码使用repaint和sleep（）使其看起来像是分形动画，但是当我运行代码时，它只是打印出分形，并且没有任何动画。

import java.awt.Graphics;
import java.util.Scanner;
import java.util.regex.Matcher;

import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.WindowConstants;

public class FernFractal {
    
    public static int MAXDIM = 600;
    public static int speed = 1;
    public static int type = 1;

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        JFrame frame = new JFrame("FernBoi");
        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
        frame.setSize(MAXDIM,MAXDIM);
        Fern f = new Fern();
        frame.add(f);
        frame.setVisible(true);
        new Thread(f).start();
    }
    
}
class Fern extends JPanel implements Runnable{
    private static final long serialVersionUID = 1L;
    private static int componentsDrawn = 0;
    private static int componentsToDraw = 0;

    @Override
    public void paintComponent(Graphics g) {
        // TODO Auto-generated method stub
        super.paintComponent(g);
        int startX = (int) (FernFractal.MAXDIM * 0.3);
        int startY = (int) (FernFractal.MAXDIM * 0.6);
        int startLen = (int) (FernFractal.MAXDIM * 0.1);
        drawFractal1(g,startX,startY,startLen,(Math.PI/3));
    }
    
    private void drawFractal1(Graphics g,int x1,int y1,int segmentLength,double angle) {

        int currX = x1;
        int currY = y1;
        int nextX = currX + (int) (segmentLength * Math.cos(angle));
        int nextY = currY - (int) (segmentLength * Math.sin(angle));
        // Note that whenever you draw a line,it should be in an if statement
        // like the one below,so that you can progressively render the fractal
        if(segmentLength <= 1) return;

        if (componentsDrawn < componentsToDraw) {
            componentsDrawn++;
            g.drawLine(currX,currY,nextX,nextY);
            //left
            drawFractal1(g,nextY,(int)(segmentLength*0.6),(angle + ((Math.PI) / 2)) );
            //right
            drawFractal1(g,(angle - ((Math.PI) / 2)) );
            //center
            drawFractal1(g,(int)(segmentLength*0.9),(angle - ((Math.PI) / 36)) );
        }




    }
    
    public void run() {
        try {
            while(true) {
                componentsDrawn = 0;
                componentsToDraw++;
                this.repaint();
                for (int i = 0; i < FractalTester.speed; i++) {
                    Thread.sleep(100);
                }
            }
        }
        catch (InterruptedException e) {}
    }
    
}

^上面是我在FernFractal类中的全部代码。我是在某个地方放错了方法还是在某处我的计算不正确？有人可以帮我弄清楚为什么动画不起作用吗？非常感谢。

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