如何在同一类的不同对象间获取变量值并进行交互：以碰撞检测为例

public class Player {
    private int x;
    private int y;

    public Player(int x, int y) {
        this.x = x;
        this.y = y;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public void move(int dx, int dy) {
        this.x += dx;
        this.y += dy;
    }
}

public class Sphere {
    private int x;
    private int y;
    private int radius;

    public Sphere(int x, int y, int radius) {
        this.x = x;
        this.y = y;
        this.radius = radius;
    }

    public int getX() {
        return x;
    }

    public int getY() {
        return y;
    }

    public int getRadius() {
        return radius;
    }
}

public class Game {
    private Player player;
    private Sphere sphere;

    public Game() {
        this.player = new Player(0, 0);
        this.sphere = new Sphere(5, 5, 2);
    }

    public void update() {
        // 模拟玩家移动
        player.move(1, 1);

        // 碰撞检测
        if (checkCollision(player, sphere)) {
            System.out.println("碰撞发生了！");
        } else {
            System.out.println("没有发生碰撞。");
        }
    }

    private boolean checkCollision(Player player, Sphere sphere) {
        int playerX = player.getX();
        int playerY = player.getY();
        int sphereX = sphere.getX();
        int sphereY = sphere.getY();
        int sphereRadius = sphere.getRadius();

        // 简单的距离检测
        double distance = Math.sqrt(Math.pow(playerX - sphereX, 2) + Math.pow(playerY - sphereY, 2));
        return distance <= sphereRadius;
    }

    public static void main(String[] args) {
        Game game = new Game();
        game.update();
    }
}