///////    File FreeChecking.java    ///////

class FreeChecking extends Account
{
     public FreeChecking(int n,     // constructor
                 double b, String owner)
    {   super(n, b, owner);
        free = (b >= minBalance);
    }
     public FreeChecking() {}           // no-arg constructor
     public boolean fee()               // charge monthly fee
     {   boolean ok;
         if ( ! free )
         {  if ( ok = withdraw(serviceFee) )
                 free = (balance() >= minBalance);
            return(ok);
         }
         return(true);
     }
     public boolean withdraw(double amt)   // withdraw amt 
     {   boolean ok = super.withdraw(amt);        
         if ( ok && balance() < minBalance )
              free = false;
         return(ok);
     }
     public static void minbal(float m) // set min balance
     { minBalance = m; }                   
     public static void fee(float f)    // set fee
     { serviceFee = f; }

     private static float minBalance = 250.0f;
     private static float serviceFee = 18.0f;
     private boolean free;
}