Dart语言级联运算符（..）

class Student { 
   void test_method() { 
      print("This is a  test method"); 
   } 

   void test_method1() { 
      print("This is a  test method1"); 
   } 
}  
void main() { 
   new Student() 
   ..test_method() 
   ..test_method1(); 
}