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beisong7/sample.dart

Created May 2, 2023 12:50
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class dart code
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sample.dart
// A person. The implicit interface contains greet().
class Person {
// In the interface, but visible only in this library.
final String _name;
// Not in the interface, since this is a constructor.
Person(this._name);
// In the interface.
String greet(String who) => 'Hello, $who. I am $_name.';
}
// An implementation of the Person interface.
class Impostor implements Person {
String get _name => '';
String greet(String who) => 'Hi $who. Do you know who I am?';
}
//function that returns a string
String greetBob(Person person) => person.greet('Bob');
class Car {
final String _name;
Car(this._name);
String horn() => 'Hoooorn! $_name is passing';
}
String greet(Person person, String secondPerson) => person.greet(secondPerson);
void main() {
print(greetBob(Person('Kathy')));
// print(Person('James Bond').greet('007'));
print(greetBob(Impostor()));
// print(greetBob(Car('Toyota')));
var human = new Person('Udeme');
// print(human.greet('Ben'));
print(greet(human, 'Katty'));
}
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