Dart语言实现接口

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__________); 
   } 
}

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