用匿名类的接口实现以下UML图,java测试类中，有三个柱体，分别以三角形，圆形，矩形为底面积，求它们的体积。pillar类连接Geometry接口 。测试用例：:三角形边：（3，4，5）;圆形半径：2; 矩形边（3，4），柱体高：6.

以下是使用匿名类的接口实现UML图的Java代码，可以计算三角形、圆形和矩形柱体的体积：

public interface Geometry {
    double getArea();
}

class Pillar {
    private Geometry bottom;
    private double height;

    public Pillar(Geometry bottom, double height) {
        this.bottom = bottom;
        this.height = height;
    }

    public double getVolume() {
        return bottom.getArea() * height;
    }
}

public class Test {
    public static void main(String[] args) {
        // 创建三角形底面积
        Geometry triangle = new Geometry() {
            double a = 3;
            double b = 4;
            double c = 5;
            double p = (a + b + c) / 2;

            @Override
            public double getArea() {
                return Math.sqrt(p * (p - a) * (p - b) * (p - c));
            }
        };

        // 创建圆形底面积
        Geometry circle = new Geometry() {
            double radius = 2;

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

        // 创建矩形底面积
        Geometry rectangle = new Geometry() {
            double length = 3;
            double width = 4;

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

        // 创建三个柱体并计算体积
        Pillar pillar1 = new Pillar(triangle, 6);
        Pillar pillar2 = new Pillar(circle, 6);
        Pillar pillar3 = new Pillar(rectangle, 6);

        System.out.println("三角形柱体的体积为：" + pillar1.getVolume());
        System.out.println("圆形柱体的体积为：" + pillar2.getVolume());
        System.out.println("矩形柱体的体积为：" + pillar3.getVolume());
    }
}