覆盖上层阶级的变量 [英] override variables of upper classes

问题描述

我有一个具有var title的上层类，然后又有不同的类，它们扩展了上层类，在其中我要覆盖该var title.

I have an upper class that has a var title and then I have different classes, that extend this upper one, in which I want to override that var title.

我正在尝试使用@override void set方法，但是我不知道如何正确使用它.有人可以帮我吗?

I was trying with @override void set method, but I didn't understand how to use it properly. Can someone help me please?

推荐答案

您可以将getter和setter与super结合使用以实现所需的结果:

You can use getter and setter combined with super to achieve the desired result:

class Foo {
  String title;
}

class Override extends Foo {
  String get title {
    print("get title");
    return super.title;
  }

  set title(value) {
    print("Set title");
    super.title = value;
  }
}

---

Foo f = Override();
f.title = "Hello World";
print(f.title);

这将打印

Set title
get title
Hello World

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