#48 What is Inheritance in Java

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In this lecture we will learn:
- What is inheritance in Java?
- Use of extend keyword in inheritance
- The main aim of inheritance
- Important points related to inheritance

#1
For every class that we create in a code, there will be a class file.
- Inheritance helps to add more features by inheriting the class.
- For inheritance, we only required the class file. There is no need for a java file.
- extends keyword is used in inheritance to inherit properties of a parent class.

#2
- The main aim of inheritance is to implement the concept of reusability, saving our time and resources and also creating better connections between different classes, and achieving method overriding.

#3
Points related to inheritance in Java:-
- The superclass of every class is an Object class.
In the absence of any other explicit superclass, every class is implicitly a subclass of the Object class.
- A superclass can have any number of subclasses but a subclass can have only one superclass.
- Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked from the subclass.
- A subclass does not inherit the private members of its parent class.

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[kvelez]

public class Main{
public static void main(String[] args) {
Advanced obj = new Advanced();
System.out.println(obj.add(8, 3));
System.out.println(obj.mult(8, 3));
System.out.println(obj.sub(4, 9));
System.out.println(obj.div(4, 9));
}
}

class Calc{

public int add(int n1, int n2){
return n1 + n2;
}

public int sub(int n1, int n2){
return n1 - n2;
}

}

class Advanced extends Calc{

public int mult(int n1, int n2){
return n1 * n2;
}

public int div(int n1, int n2){
return n1 / n2;
}
}

[mrprofomedia]

hold "Shift+Alt+arrow down" to copy the lines in vscode

[옥자-pr]

What an amazing lecture! I have one question. In this case, I think it is much easier if I just create two those methods, multi() and div(), in the class Calc. But why we should make another class, AdvCalc?

[prathameshpatil]

Sir in my laptop it doesn't working with public keyword for classes.but without public keyword it executes
Why this problem is occurring

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why you upload sir this series and you have also paid batch binary java batch so is difference in those course