• Common interview question everybody facing in interviews is can we call sub class method using super class object? or can we call child class method using parent class? or can a super class call a subclass' method.
• The answer is No. but still we can say yes. so we need to what are all those scenarios of calling sub class method from super class and lets discuss about which is the actual possible case to call sub class method using super class object.
• Before that let me explain what is inheritance and how the super and sub classes related each other.

Inheritance:

•  Getting the properties from one class object to another class object is known as inheritance.
• Two types of inheritance
• Getting the properties from one class object to another with level wise and with some priorities is known as multilevel inheritance.
• Getting the properties from one class object to another class object with same priority is known as multiple inheritance
• Java does not supports multiple inheritance

Creating super class object and calling methods

• In above program super class and sub class is there and sub class extending super class.
• But we created object for super class so we can call only super class methods on that object.
• If we create sub class object we can call super class and sub class methods on that object now we can able to access super class A methods only.
• So by creating super class object we can call only super class methods

Creating super class object and calling methods

• Above program shows sub class object using super class methods and variables as we said in inheritance concept all super class members can accessed by the sub class means all super class members are available to sub class if sub class extending super class.
• So whenever we create object of sub class it will call sub class constructor and from sub class constructor super class constructor will be called so memory will be allocated to all super class non static member and sub class non static members.
• So we can call super class methods using sub class.
• B obj= new B();
• obj.print();
• So by creating sub class object we can call both super class methods and sub class methods.

 Assigning sub class reference to super class object.

• Yes we can assign sub class object to super class reference.
• So here Sub class object is created so memory allocated to all super class members
• so can we call all methods ?  No eventhough sub class object is created we can not call sub class methods because we assigned sub class object to super class reference.
• Then how its possible to call sub class methods?
• Yes its possible to call sub class methods using super class by type casting to sub class object .
• By type casting super class object to sub class object we can access all corresponding sub class and all super class methods on that reference.

 Assigning sub class reference to super class object.