e3_8.java

来自「java 初学者学习实例」· Java 代码 · 共 20 行

class Area
{
   float f(float r)
   {
      return 3.14f*r*r;
   }
   float g(floatx,float y)
   {
      return x+y;
   }
}
class Circle extends Area
{
   float f(float r)
   {
       return 3.14f*2.0f*r;
   }
}
//Circle yuan = new Circle();yuan.f(5.0f);yuan.g(1.0f,2.0f);