rectangle.java

java教程中的编程实例

public class Rectangle extends Shape{
          double length;
          double wide;
          public Rectangle(double x,double y){
             length = x ;
             wide = y ; 
                }
           public double area(){
                  double s;
                  s=length*wide;
                  return s;
                }
           public double perimeter(){
                   double p;
                    p=(length+wide)*2.0;
                     return p;
                       }
           public String getabout(){
                  return "this is Rectangle length is:"+length+"wide is+"+wide;
                        }
}