Dart Constructors in Inheritance: Default and Named Constructors. Dart for Flutter #9.5 

Because they are coming from direct c to dart 😂😂😂😂

thanks alot

@@smartherd

Namaste

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wouldn't you just have to make sure there is either always a bogus default value or just make sure that your parent class doesn't have parameters.

show ur main function

in ur code ur class employee doesn't have a super class(another class)...It does not inherit Person Class ...To make it work - class Employee extends Person{}

Hi, Tried to summarize the contents of this lesson. Hope this helps. Stay safe. /* * Section 00:00 - 02:34 (Aim : Implicit super constructor calling and execution sequence) * 1. When dog class object is created there is a call to Dog class contructor as well * as Animal class contructor. This means the Animal class constructor is implicitly * (Automatically) executed when Dog class object is created. * 2. There is a implicit call child_class_constructor() : super_class_consrtuctor() * * Section 02:34 - 04:30 (Aim: Parameterised constructors and effect on call and execution sequence ) * 1. When the constructor in child class is modified as * child_class_constructor(Parameter_1, etc) : super_class_consrtuctor(Parameter1. etc) * The constructor in super class has to be modified accordingly(match the parameters) * 2. By default : * 2.1 If the super class has a zero argument(no parameter) constructor * The default super class constructor is implicitly called from child class * Explicit call like this is not necessary * child_class_constructor() : super_class_consrtuctor() * 2.2 If the super class has a parameterised constructor * then it is compulsory to call the parameterised super class constructor from child class * like this child_class_constructor(Parameter_1, etc) : super_class_consrtuctor(Parameter1. etc) * * Section 04:30 - 05:40 (Aim: Passing values to super class constructor while creating child class object) * 1. While creating the child class object, values are passed as * ChildClass child_reference = new ChildClass(value_for_child_class_instance_variable, value_for_super_class_instance_variable); * According to the variable names, In the child class constructor values will be passed to the super class constructor * like this child_class_constructor(value_for_child_class_instance_variable, value_for_super_class_instance_variable) : super_class_consrtuctor(value_for_super_class_instance_variable) * * Section 05:50 - 10:40 (Aim: Named constructor, almost all of the above explanation is same) * */

@@attimeequalszero6750 good

@@attimeequalszero6750 1:25 He said it will implicitly print , ' Animal class constructor ' , 'Dog class constructor' twice but in my code even after using super (), it printed just once . I want to ask that is it something change in Dart since then or what ? My code is below : class Person { Person() { // Default Constructor print("Parent class Constructor"); } void work (){ // Function print("Person needs job"); } } class Employee { Employee() : super() { // Default Constructor print("Child class Constructor"); } void work () { // Function print("Employee works hard"); } } output : Parent class Constructor Person needs job Child class Constructor Employee works hard

@@avi8034 Hi, You have missed out using the extends keyword. Without using extends keyword the Person class wont be inherited by the Employee class. Like this : class Employee extends Person { //code } Hope this helps. Stay safe.

@@attimeequalszero6750 oh thank you so much sir ! stay safe you too sir !

Check. Source code link in description