Inheritance In Java: A Simple But Complete Guide

Inheritance In Java: A Simple But Complete Guide

 BY TEJAS

Inheritance is a very important concept in object-oriented programming. Inheritance is a very simple concept. All you have to do is read this article carefully and try to execute each of these programs.

Inheritance in Java

Simply put, if we look at what inheritance is, Before we start Inheritance, let's all assume that we know the concept of classes in Java. Because inheritance is the advanced concept of a class.

As you know, every java program must have one class, that class is known as the base class. And in Java, we can create one or more classes.
If we create a class, we also create a lot of objects of that class. Now, if we create a new class, we call it a derived class.

What is Inheritance in Java?

Inheritance is the process of creating new classes from existing classes. The new classes we create are called derived classes and the existing classes are called base classes.

Suppose you create a new class, you want the same objects in the class as the base class objects in the newly created derived class, as well as some new objects in that derived class. So the simple thing is you definitely don't want to rewrite the same code over and over again. So inheritance helps us in these things. Inheritance helps you to use the objects of one class in another class. We can use all base class objects (functions) in a derived class without rewriting the same code. To do that we need to use the keyword extends.

The following program will give you an idea of ​​how to use inheritance.

                        
    class A {
        void msgA(){
            System.out.println("Welcome to Inheritance in Java");
        }
    }
    class B extends A {
        //suppose if it were
        public static void main(String args[]){
            B obj=new B();
            obj.msgA(); //Now which msgA() method would be invoked
        }
    }
 
                    

You must have seen the above program?
In it, we have created two classes, one called Class A and the other B. In class A we have created the object msgA() in which we print a line "Welcome to inheritance in java".
Now let's move on to Class B. In B class, we have taken all the objects of class A in class B using the keyword extends. And now we have started the main() function in class B in which we have declared B as an object. And with the help of that object, we have called the object which in class A as a msgA().

Below is an output of the above program.

                        
    Welcome to Inheritance in Java
                        
                    

Conclusion

In this article, you have seen Java inheritance. Basically, inheritance is a process of creating new classes from the existing classes. We also look at a program in this, so your conception has been cleared.
If you like this article then comment and you can also comment even though there is a doubt.