#51 This and Super Method in Java

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In this lecture we will learn:
– Constructors in Java
– Super method in Java
– Object class in Java
– This method in Java
– Similarities in between this() and super() method

#1
– Whenever you call an object, it will create a constructor of a class.
– When we create an object of a class that it calls the constructor of a sub-class as well as a constructor of a superclass.
– If you do not pass any value in an object, then it will call the default constructor of a class.
– But if you pass the value in an object, then it will call the parameterised constructor of that class.

#2
Super() method:-
– Every constructor in Java has a method, even if you do not mention it.
– By default, the first statement in every constructor is a method called a super() method.
– Super() method means calls the constructor of a superclass.
– If you do not pass any parameter in a super method, then it will call the default constructor of a superclass.
– If you pass any parameter in a super method, then it will call the parameterised constructor of a superclass.
– To call the parameterised constructor of a parent class, we need to explicitly call the super method.

#3
Object class:-
– Every class in Java extends the Object class, even if you do not mention it.
– Object is a class in Java that contains a lot of methods.
– So, the super method of a superclass calls the constructor of an object class.
– There is multi-level inheritance in this concept.

#4
This() method:-
– this() method calls the constructor of the same class.
– If you do not pass any parameter in this method, then it will call the default constructor of the same class.
– If you pass any parameter in this method, then it will call the parameterised constructor of the same class.

#5
Similarities in between this() and super() method:-
– We can use both this and super method anywhere except the static area.
– Both this and super method can be used any number of times in a code.
But both can be used only one time inside a constructor.
– Both are non-static keywords.

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