INHERITANCE CONCEPT IN JAVA PDF DOWNLOAD

When a Class extends another class it inherits all non-private members including fields and methods. Inheritance in Java can be best understood in terms of. Inheritance is a mechanism in which one class acquires the property of another class. For example, a child inherits the traits of his/her parents. With inheritance, we can reuse the fields and methods of the existing class. Hence, inheritance facilitates Reusability and is an important concept of OOPs. Java - Inheritance. Inheritance can be defined as the process where one class acquires the properties (methods and fields) of another. With the use of inheritance the information is made manageable in a hierarchical order.


INHERITANCE CONCEPT IN JAVA PDF DOWNLOAD

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INHERITANCE CONCEPT IN JAVA PDF DOWNLOAD


Another Change Request What if the requirement changes further?

Inheritance

Like to add credit card account with its own unique requirement of deposits. Using structural approach you have to change tested piece of deposit code again.

But using object-oriented approach, you will just create a new class with its unique implementation of deposit method highlighted red in the image below. So even though the structural programming seems like an easy approach initially, OOP's wins in inheritance concept in java long term.

Advantage of Inheritance in OOPs But one may argue that across all classes, you have a repeated pieces of code.

To inheritance concept in java this, you create a parent class, say "account" and implement the same function of deposit and withdraw. And make child classes inherited "account" class.

So that they will have access to withdraw and deposit functions in account class. The Superclass reference variable can hold the subclass object, but using that variable you can access only the members of the superclass, so to access the members of both classes it is recommended to always create reference variable to the subclass.

If you consider the above program, you can instantiate the class as given below. Constructors are not members, so they are not inherited by subclasses, but the constructor of the superclass can be invoked inheritance concept in java the subclass.

Inheritance in Java OOPs with Example

The super keyword The super keyword is similar to this keyword. Following are the scenarios where the super keyword is used.

It is used to differentiate the members of superclass from the members of subclass, if they have same names.

INHERITANCE CONCEPT IN JAVA PDF DOWNLOAD

It is used to invoke the superclass constructor from subclass. Differentiating the Members If a class is inheriting the properties of another class.

Inheritance - Learn Java - Free Interactive Java Tutorial

And if the members of the superclass have the names inheritance concept in java as the sub class, to differentiate these variables we use super keyword as shown below. There is no effective limit to the number of inheritance levels.

The methods and properties of a subclass can be used just like those of it's superclass. They can also be overridden.

Overriding is inheritance concept in java process of replacing or augmenting the original code with new code to suit the current purpose.

An overridden method's signature in the subclass remains the same as the superclass but the contents of the method will be changed to meet the goal of the method in it's new form.

Inheritance in Java | Core Java Tutorial | Studytonight

This may even mean executing the code inherited from the superclass before or after executing some new code within the same inheritance concept in java. To execute the inherited code from within the subclass, prefix the method with super'. Inheritance promotes code reuse and the concept of generic-to-specific implementation.