import javax.swing.*;

import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;
import java.awt.Color;
import java.awt.Graphics;
import java.util.Random;

public class keyExample extends JPanel implements ActionListener, KeyListener {
    Timer t = new Timer(5, this);
    double x = 0, y = 0;

    double changeX = 0, changeY = 0;

    public keyExample() {
        t.start();
        addKeyListener(this);

        setFocusable(true);

        setFocusTraversalKeysEnabled(false);

    }

    private static final int N_CIRCLES = 10;

    private static final double MIN_RADIUS = 5;

    private static final double MAX_RADIUS = 50;

    public void run() {
        Random gen = new Random();

        for (int i = 0; i < N_CIRCLES; i++) {

            double r = gen.nextDouble(MIN_RADIUS, MAX_RADIUS);
            double x = gen.nextDouble(0, getWidth() - 2 * r);
            double y = gen.nextDouble(0, getHeight() - 2 * r);

            Circle circle = new Circle(x, y, 2 * r, 2 * r);
            circle.setFilled(true);

            int red = gen.nextInt(256);
            int green = gen.nextInt(256);
            int blue = gen.nextInt(256);

            Color backColor = new Color(red, green, blue);

            pane.add(panel);

        }
        add(circle);
    }
}

我应该创建一个代码来生成具有随机颜色和大小的圆。同时调整一些零件和另一个。我造成了我无法理解的混乱。请帮我修改代码，这样我就能产生我想要的结果。