Dart编程实例 - 实现一个接口

void main() {

   ConsolePrinter cp= new ConsolePrinter();

   cp.print_data();

}  

class Printer {

   void print_data() {

      print("__________Printing Data__________");

   }

}  

class ConsolePrinter implements Printer {

   void print_data() {  

      print("__________Printing to Console__________");

   }

}