Java测试类中，有三个柱体，分别以三角形，圆形，矩形为底面积，用接口实现求它们的体积

以下是Java测试类中，使用接口实现求三个柱体体积的示例代码：

public class Test {
    public static void main(String[] args) {
        // 创建三个底面不同的柱体对象
        Triangle triangle = new Triangle(3, 4);
        Circle circle = new Circle(2);
        Rectangle rectangle = new Rectangle(2, 3);

        // 创建一个柱状对象
        Pillar pillar = new Pillar();

        // 使用接口实现求三个柱体体积
        double volume1 = pillar.getVolume(triangle, 5);
        double volume2 = pillar.getVolume(circle, 5);
        double volume3 = pillar.getVolume(rectangle, 5);

        // 输出结果
        System.out.println("三角形底面积为：" + triangle.getArea() + "，高为5的柱体体积为：" + volume1);
        System.out.println("圆形底面积为：" + circle.getArea() + "，高为5的柱体体积为：" + volume2);
        System.out.println("矩形底面积为：" + rectangle.getArea() + "，高为5的柱体体积为：" + volume3);
    }
}

// 抽象类Geometry
abstract class Geometry {
    public abstract double getArea();
}

// 圆形类Circle
class Circle extends Geometry {
    private double radius;

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

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

// 矩形类Rectangle
class Rectangle extends Geometry {
    private double length;
    private double width;

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

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

// 三角形类Triangle
class Triangle extends Geometry {
    private double base;
    private double height;

    public Triangle(double base, double height) {
        this.base = base;
        this.height = height;
    }

    @Override
    public double getArea() {
        return 0.5 * base * height;
    }
}

// 接口IVolume
interface IVolume {
    double getVolume(Geometry geometry, double height);
}

// 柱状类Pillar
class Pillar implements IVolume {
    @Override
    public double getVolume(Geometry geometry, double height) {
        return geometry.getArea() * height;
    }
}