rectangle.java

Java程序设计技巧与开发实例附书源代码。

public class Rectangle extends Shape
{  protected double length, width;
      public Rectangle(double _length, double _width)
     {  name   = "Rectangle";
        length = _length;
        width  = _width;
     }
   public void computeArea()
    {  area = length * width; }
   public void computePerimeter()
    {  perimeter = 2*(length + width); }
}