Execute DART Online

abstract class Person {
    String _name;
  
    void greet();
  
    void walk();
  
    void eat() {
      print('人得吃饭');
    }
  }

  class Teacher implements Person {
    @override
    void greet() {
        print('gren');
    }
  
    @override
    void walk() {}
  
    @override
    void eat() {}
  
    @override
    get _name => '';
  
    @override
    set _name(String __name) {
      _name = __name;
    }
  }
void main(){
    Teacher ter = Teacher();
    
    
}