用Java编写程序，用匿名类实现，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。 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Java编写程序，使用匿名类实现，计算三个柱体体积的代码：

public class AppTest {
    public static void main(String[] args) {
        // 圆柱体积
        double radius = 2;
        double height = 6;
        Geometry cylinder = new Geometry() {
            @Override
            public double getArea() {
                return Math.PI * radius * radius;
            }

            @Override
            public double getCircum() {
                return 2 * Math.PI * radius;
            }
        };
        double cylinderVolume = cylinder.getArea() * height;
        System.out.println("圆柱体积：" + cylinderVolume);

        // 矩形柱体积
        double length = 3;
        double width = 4;
        Geometry rectangularPrism = new Geometry() {
            @Override
            public double getArea() {
                return length * width;
            }

            @Override
            public double getCircum() {
                return 2 * (length + width);
            }
        };
        double rectangularPrismVolume = rectangularPrism.getArea() * height;
        System.out.println("矩形柱体积：" + rectangularPrismVolume);

        // 三角形柱体积
        double a = 3;
        double b = 4;
        double c = 5;
        Geometry triangularPrism = new Geometry() {
            @Override
            public double getArea() {
                double p = (a + b + c) / 2;
                return Math.sqrt(p * (p - a) * (p - b) * (p - c));
            }

            @Override
            public double getCircum() {
                return a + b + c;
            }
        };
        double triangularPrismVolume = triangularPrism.getArea() * height;
        System.out.println("三角形柱体积：" + triangularPrismVolume);
    }
}

abstract class Geometry {
    public abstract double getArea();

    public abstract double getCircum();
}