学步园

public class Override
{
                       public static void main(String[] args)
              {
                       Son son = new Son();
                        son.run();
              }
}

            class Father
       {
                       public void run()
                     {
                                System.out.println("father is running");
                      }
      }
                        class Son extends Father
           {
                public void run()
                    {
                        System.out.println("son is running");
                    }
            }