Java编写一个接口程序，其中定义一个计算机体积的方法，然后再设计应用程序实现这个接口

Java编写一个接口程序，其中定义一个计算机体积的方法，然后再设计应用程序实现这个接口，分别计算矩形柱面体积和圆形柱面体积

public class Demo1 {
public static void main(String[] args) {
double volume = volume(5, 2, 3);
System.out.println("体积：" + volume);
double volume1 = volume(5, 2);
System.out.println("体积：" + volume1);
}

/**
 * 计算矩形柱体体积
 * @param length 长
 * @param wide 宽
 * @param high 高
 * @return
 */
public static double volume(double length,double wide,double high) {
    return length * wide * high;
}

/**
 * 计算圆柱体体积
 * @param length
 * @param radius
 * @return
 */
public static double volume(double length,double radius) {
    return length * radius * radius * 3.14;
}

}

定义一个Shape接口，并且定义计算体积的方法
知道计算矩形柱面体积和圆形柱面体积的公式就可以了。

public interface TreeDim {

    double volume();

    class Cube implements TreeDim {
        private final double height;
        private final double width;
        private final double length;

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

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

        public double getHeight() {
            return height;
        }
        public double getWidth() {
            return width;
        }
        public double getLength() {
            return length;
        }
    }

    class Cylinder implements TreeDim {
        private static final double PI = 3.14;
        private final double radius;
        private final double length;

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

        @Override
        public double volume() {
            return PI * radius * radius * length;
        }

        public double getRadius() {
            return radius;
        }
        public double getLength() {
            return length;
        }
    }

    public static void main(String[] args) {
        TreeDim cube = new Cube(3,4,5);
        System.out.println(cube.volume());
        TreeDim cylinder = new Cylinder(6,7);
        System.out.println(cylinder.volume());
    }
}