写一个Copyable接口，计算长宽高分别为2,5,4的长方体，底面半径为4，高为5的圆柱体，半径为5的球体的体积

好的，下面是一个可能的实现：

public interface Copyable {
    double getVolume();
    Copyable copy();
}

public class Cuboid implements Copyable {
    private double length;
    private double width;
    private double height;

    public Cuboid(double length, double width, double height) {
        this.length = length;
        this.width = width;
        this.height = height;
    }

    @Override
    public double getVolume() {
        return length * width * height;
    }

    @Override
    public Copyable copy() {
        return new Cuboid(length, width, height);
    }
}

public class Cylinder implements Copyable {
    private double radius;
    private double height;

    public Cylinder(double radius, double height) {
        this.radius = radius;
        this.height = height;
    }

    @Override
    public double getVolume() {
        return Math.PI * radius * radius * height;
    }

    @Override
    public Copyable copy() {
        return new Cylinder(radius, height);
    }
}

public class Sphere implements Copyable {
    private double radius;

    public Sphere(double radius) {
        this.radius = radius;
    }

    @Override
    public double getVolume() {
        return 4.0 / 3.0 * Math.PI * Math.pow(radius, 3);
    }

    @Override
    public Copyable copy() {
        return new Sphere(radius);
    }
}

public class Main {
    public static void main(String[] args) {
        Cuboid cuboid = new Cuboid(2, 5, 4);
        System.out.println("长方体的体积为：" + cuboid.getVolume());

        Cylinder cylinder = new Cylinder(4, 5);
        System.out.println("圆柱体的体积为：" + cylinder.getVolume());

        Sphere sphere = new Sphere(5);
        System.out.println("球体的体积为：" + sphere.getVolume());
    }
}

这里定义了一个 `Copyable` 接口，和三个实现了该接口的类，分别表示长方体、圆柱体和球体。接着在 `Main` 类的 `main` 方法中创建了这三个对象，并调用了它们的 `getVolume` 方法来计算体积。注意，这里的参数分别对应于题目中所给出的长宽高和半径高。