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如何在实例化时重写Dart方法[[副本]

dart flutter

Xcoder · 技术社区 · 4 年前

在Java中,可以执行以下操作:

class Example {
    void methodA(int x) {}
}

Example obj = new Example() {
    @Override
    void methodA(int x) {
        //some implementation here
    }
}

有没有办法重写Dart中对象实例化的方法?

1 回复 | 直到 4 年前

Md Omor Faruqe 4 年前

//Dart程序来说明 //方法重写概念

class SuperGeek {
    
  // Creating a method
  void show(){
    print("This is class SuperGeek.");
  }
}
   
class SubGeek extends SuperGeek {
    
  // Overriding show method
  void show(){
    print("This is class SubGeek child of SuperGeek.");
  }
}
   
void main() {
  // Creating objects
  //of both the classes
  SuperGeek geek1 = new SuperGeek();
  SubGeek geek2 = new SubGeek();
    
  // Calling same function
  // from both the classes
  // object to show method overriding
  geek1.show();
  geek2.show();
}

这是超级怪才。

第二个例子:

//Dart程序来说明 //方法重写概念

class SuperGeek {
    
  // Creating a method
  void show(){
    print("This is class SuperGeek.");
  }
}
   
class SubGeek1 extends SuperGeek {
    
  // Overriding show method
  void show(){
    print("This is class SubGeek1 child of SuperGeek.");
  }
}
   
class SubGeek2 extends SuperGeek {
  // Overriding show method
   
  void show(){
    print("This is class SubGeek2 child of SuperGeek.");
  }
}
  
void main() {
    
  // Creating objects of both the classes
  SuperGeek geek1 = new SuperGeek();
  SubGeek1 geek2 = new SubGeek1();
  SubGeek2 geek3 = new SubGeek2();
    
  // Calling same function
  // from both the classes
  // object to show method 
  // overriding
  geek1.show();
  geek2.show();
  geek3.show();
}