circle.java

Java程序设计技巧与开发实例附书源代码。

public class Circle
    extends Shape
{
   protected double radius;
   public Circle(double _radius)
   {
      name = "Circle";
      radius = _radius;
   }

   public void computeArea()
   {
      area = Math.PI * radius * radius;
   }

   public void computePerimeter()
   {
      perimeter = 2 * Math.PI * radius;
   }
}