java实验题 内部类的定义与使用

定义一个Cube类，其中包含一个变量height，一个方法：计算立方体的体积(带形参，形参为面积)。并在其内部定义一个Rectangle类，其中包含两个变量width和height，一个方法：计算底面积。

 class Cube {
    private double height;

    Cube() {}

    Cube(double height) {
        this.height = height;
    }

    public double volume(double area) {
        return area * height;
    }

    public class Rectangle {
        private double width;
        private double length;

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

        public double area() {
            return length * width;
        }
    }
}

public class Test {
    public static void main(String[] args) {
        Cube.Rectangle S = new Cube().new Rectangle(10.0, 10.0);
        double s = S.area();
        Cube V = new Cube(20.0);
        double v= V.volume(s);
        System.out.println("立方体的体积 = " + v);
    }
}

using System; class UseRectangle { static void Main() { double lenth = 23.3; double wide = 19.4; double high = 30.5; Console.Write("The Rectangle lenth={0} wide={1} high={2} of cube=", lenth, wide, high); Console.WriteLine("{0}", cube(lenth, wide, high)); } static double cube(double lenth, double wide, double high) { return lenth * wide * high; } }

 public class Cube {
    private double height;
    public double tiji(double area){
        return area*height;
    }
    class Rectangle{
        public double height;
        public double width;
        public double area(double length,double width){
            return length*width;
        }
    }
}

就在Cute类里面写一个Rectangle类，没什么特别的，只要是Cute类使用这个内部类的话用法和平常没什么区别

/**

• 外部类Cube */

public class Cube {
private double height;

    /**
 * 计算体积的方法
 * @param area 面积
 * @return 当前物体的体积
 */

public double volume(double area){
    return area * height;
}

/**
 * 内部类Rectangle
 * 包含属性:width、height
 * 包含方法:volume(double length,double width)
 */

class Rectangle{
    public double width;
    public double height;

        /**
     * 计算底面积的方法
     * @param length
     * @param width
     * @return 当前物体的底面积
     */

    public double volume(double width ,double length){
        return width * length;
    }
}

}