named constructor dart
class Person {
String name;
int age;
Person({this.name = '', this.age = 0});
}
void main() {
Person person1 = Person(name: "Raaj", age: 35);
print(person1.age);
}named constructor dart
class Person {
String name;
int age;
Person({this.name = '', this.age = 0});
}
void main() {
Person person1 = Person(name: "Raaj", age: 35);
print(person1.age);
}dart this constructor
class MyClass {
int param1;
MyClass(this.param1);
}
final obj = MyClass(100);
class MyClassNamed { // with named parameters
int param1;
MyClassNamed({required this.param1});
}
final objNamedParam = MyClassNamed(param1: 100);dart constructor
void main() {
Human jenny = Human(height1 :15);
print(jenny.height);
Human jerry = Human(height1: 20);
print(jerry.height);
}
class Human {
double height = 0;
Human({height1 = 0}) { // constructor = initializes values of properties in the class.
this.height = height1;
}
}constructor in dart
//Creating object.
void main(){
SelfDrivingCar myLamb = SelfDrivingCar('Floride');
myLamb.drive();
}
//Initializing class Car.
class Car {
int numberofwheels = 4;
void drive() {
print('this is a car');
}
}
//using Inheritance
class SelfDrivingCar extends Car {
String destination='k';
SelfDrivingCar(String userDestination){ //constructor
destination = userDestination;
}
@override //polymorphism.
void drive() {
super.drive(); // accessing parent's methods.
print('sterring wheel to $destination');
}
}with keyword in dart
mixin Human {
String name;
int age;
void about();
}
class Doctor with Human {
String specialization;
Doctor(String doctorName, int doctorAge, String specialization) {
name = doctorName;
age = doctorAge;
this.specialization = specialization;
}
void about() {
print('$name is $age years old. He is $specialization specialist.');
}
}
void main() {
Doctor doctor = Doctor("Harish Chandra", 54, 'child');
print(doctor.name);
print(doctor.age);
doctor.about();
}Copyright © 2021 Codeinu
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