Dart编程实例 - 方法覆盖

import 'dart:io';

void main() {

   Child c = new Child();

   c.m1(12);

}

class Parent {

   void m1(int a){ print("value of a ${a}");}

}

class Child extends Parent {

   @override

   void m1(String b) {

      print("value of b ${b}");

   }

}