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);
   }

   public void display()
   {
      super.display();
      System.out.println("Length: " + length);
      System.out.println("Width: " + width);
   }

}