泛型和实际类型之间有什么关系？ （镖）

Question

When defining base classes, I find that generics and actual types are somewhat different and confusing.

Like the following:

When I use basic types, the code works well.

void main() {
  var aa = AA.name("11");
  aa.test();
}

class AA<T> {
  T field;

  AA.name(this.field);

  void test() {
    print(field.runtimeType); 
    print(T); 
    print(field.runtimeType == T);  
  }
}

this result:

String
String
true

But when I use other types, things change.

void main() {
  var aa = AA.name(["11"]);
  aa.test();
}

class AA<T> {
  T field;

  AA.name(this.field);

  void test() {
    print(field.runtimeType);
    print(T);
    print(field.runtimeType == T);
  }
}

the result:

List<String>
List<String>
false

Both are List < String > types. Why are the corresponding types different?

Answer 1

Try change this line

print(field.runtimeType == T);

to

print(field.runtimeType.toString() == T.toString());

It will return true.