Playing Compiler—ConstructorsExplain why the following classes do not compile.   public cl...

Playing Compiler—Constructors

Explain why the following classes do not compile.

   public class Papa   {     protected int x;     public Papa(int y)     {       x = y;     }   }

   public class Son extends Papa   {     public Son()     { }

     public static void main(String[] args)     { }

   }