java计算体积面积程序.doc

实验3：修改实验7中定义的Rectangle类，使之拥有两个构造方法。其中一个是默认的，它使两点的坐标都为（0，0）;另一个带有4个参数，求出左上角和右下角点坐标为（2.1，3.2）、（5.2，6.3）的矩形的周长及面积，再利用带参数的构造方法创建Rectangle对象，求出左上角和右下角点坐标为（1，2）、（6.8，10.5）的矩形的周长及面积.主要代码class pointdouble x,y;class Rectanglepoint A=new point();point B=new point();Rectangle()Rectangle(point A,point B) point A=new point(); point B=new point();A.x=2.1; A.y=3.2; B.x=5.2; B.y=6.3;System.out.println(周长是:+2*(B.x-A.x)+(A.y-B.y); System.out.println(面积是:+(B.x-A.x)*(A.y-B.y); double zhouchang(point A,point B) double L=2*(B.x-A.x)+(A.y-B.y); return L;double Area(point A,point B) double AR=(B.x-A.x)*(A.y-B.y); return AR;public class fourpublic static void main(String args) point A=new point(); point B=new point(); A.x=1; A.y=2; B.x=6.8; B.y=10.5; Rectangle C=new Rectangle(); System.out.println(周长是:+C.zhouchang(A,B); System.out.println(面积是:+C.Area(A,B); 修改实验3public class Rectanglepublic double left,top,right,floor;public Rectangle()this.left=left=0;this.top=top=0;this.right=right=0;this.floor=floor=0;public Rectangle(double left,double top,double right,double floor)this.left=left;this.top=top;this.right=right;this.floor=floor;public double Perimeter()double w=right-left;double h=floor-top;double p=(w+h)*2;return p;public double Area()double w=right-left;double h=floor-top;double ar=w*h;return ar;public static void main(String args)Rectangle r1=new Rectangle(2.1,3.2,5.2,6.3);System.out.println(左上角和右下角点坐标为（2.1，3.2）、（5.2，6.3）);System.out.println(周长为：+r1.Perimeter();System.out.println(面积为：+r1.Area();Rectangle r2=new Rectangle(1,2,6.8,10.5);System.out.println(左上角和右下角点坐标为（1，2）、（6.8，10.5）);System.out.println(周长为：+r2.Perimeter();System.out.print