shape.java

Java程序设计技巧与开发实例附书源代码。

public class Shape
{
   protected String name;
   protected double area, perimeter;

   public Shape()
   {
      name = "undetermined";
      area = perimeter = 0;
   }

   public String toString()
   {
      return name + " [area = " + area + ", perimeter = " + perimeter + "]";
   }

   public void display()
   {
      System.out.println(toString());
   }

}