hansoko's questions

renderHanoi() 方法应该移动磁盘，方法是从 VBox 中清除磁盘，然后在每次移动后以新顺序再次添加它们，但似乎没有显示任何内容，除非它是最后一个移动，这使得一切都毫无意义。

我尝试了不同的创建延迟的方法，如 Thread.sleep、Platform.runLater 等。它们似乎都不起作用。我该如何解决这个问题？

import java.util.Arrays;
import java.util.Random;
import javafx.animation.AnimationTimer;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.scene.Scene;
import javafx.scene.layout.HBox;
import javafx.scene.layout.VBox;
import javafx.scene.paint.Color;
import javafx.scene.shape.Rectangle;
import javafx.stage.Stage;

public class App extends Application {

    @Override
    public void start(Stage stage) {
        HBox platform = new HBox();
        VBox[] towerBoxes = new VBox[] { new VBox(), new VBox(), new VBox()};
        platform.getChildren().addAll(Arrays.asList(towerBoxes));
        Hanoi testing = new Hanoi(10);
        testing.towerBoxes = towerBoxes;
        var scene = new Scene(platform, 640, 480);
        stage.setScene(scene);
        stage.show();
        testing.solve();
    }

    public static void main(String[] args) {
        launch();
    }
}

class Tower {
    private int sp = 0;
    private Rectangle[] disks;
    
    Tower(int n) {
        disks = new Rectangle[n];
    }
    
    public void push(Rectangle entry) {
        if (sp < disks.length)
            disks[sp++] = entry;
        else
            System.err.println(this + ".push(" + entry + ") failed, stack is full");
    }
    
    public Rectangle pop() {
        if (sp > 0)
            return disks[--sp];
        else {
            System.err.println(this + ".pop() failed, stack is empty");
            return null;
        }
    }
    
    public boolean hasEntry() {
        return sp > 0;
    }
    
    @Override
    public Tower clone() {
        Tower copy = new Tower(disks.length);
        copy.sp = this.sp;
        copy.disks = this.disks.clone();
        return copy;
    }
}

class Hanoi {
    Tower src;
    Tower aux;
    Tower dest;
    int n;
    
    public VBox[] towerBoxes;
    
    public Hanoi(int n) {
        src = new Tower(n);
        aux = new Tower(n);
        dest = new Tower(n);
        
        this.n = n;
        
        for (int i = 0; i < n; i++) {
            Rectangle disk = new Rectangle(30 + 20 * i, 10);
            Color diskColor = generateRandomColor();
            disk.setFill(diskColor);
            disk.setStroke(diskColor);
            src.push(disk);
        }
    }
    
    private static Color generateRandomColor() {
        Random random = new Random();
        double red = random.nextDouble();
        double green = random.nextDouble();
        double blue = random.nextDouble();
        
        return new Color(red, green, blue, 1.0);
    }
    
    private void solve(int n, Tower src, Tower aux, Tower dest) {
        if (n < 1) {
            return;
        }
        solve(n-1, src, dest, aux);
        dest.push(src.pop());
        System.out.println(n);
        solve(n-1, aux, src, dest);
    }
    
    public void solve() {
        renderHanoi();
        timer.start();
        solve(n, src, aux, dest);
    }
    
    AnimationTimer timer = new AnimationTimer() {
        @Override
        public void handle(long now) {
          renderHanoi(); // Update UI after each frame
        }
    };

    
    private void renderHanoi() {
        for (VBox towerBox:towerBoxes)
            towerBox.getChildren().clear();
        Tower[] towersCopy = new Tower[]{src.clone(), aux.clone(), dest.clone()};
        for (int i = 0; i < 3; i++)
            while (towersCopy[i].hasEntry())
                towerBoxes[i].getChildren().add(towersCopy[i].pop());
    }
}