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Polymorphism in Java is another important feature of OOPs concept. We have seen an overview of polymorphism in the tutorial OOPs concepts in Java. In this tutorial, we will understand in detail about polymorphism and its different types. We will cover about Static Polymorphism, Dynamic Polymorphism, Runtime Polymorphism.
What is polymorphism in Java
Polymorphism in Java as the name suggests means the ability to take multiple forms. It is derived from the Greek words where Poly means many and morph means forms. In Java, polymorphism in java is that the same method can be implemented in different ways. To understand this, we need to have an idea of inheritance in java as well which we have learned in the previous tutorial.
Types of Polymorphism in Java
Below are the different types of polymorphism in java.
Static Polymorphism
When we overload a static method, we call it as static polymorphism. Since it resolves the polymorphism during compile time, we can call also name it as compile-time polymorphism. We can implement this type of polymorphism in java using either method overloading or operator overloading. In static polymorphism, during compile time it identifies which method to call based on the parameters we pass.
Let's understand this in detail with the help of examples.
Method overloading
When there are many methods with the same name but different implementations, we call it a method overloading.
Volgens mij zaten wij in de 60-er jaren zo op de trappen van het Nationaal Monument op de Dam in Amsterdam.
The Java leg of our trip. Started from Jakarta to Yogyakarta by train, to Mt. Bromo and from there to Surabaya
The Java leg of our trip. Started from Jakarta to Yogyakarta by train, to Mt. Bromo and from there to Surabaya
Photo taken for "Mad Love" series ran in Java Feb '11
Available light shoot w/ 36'' gold/silver mix reflector
Very little post
Clothing Designer: Jose Trifilio
Models from: Courtier - www.mycourtier.com/
Assisted by Tyler Green - www.stillhearts.com
Make up by: Rayanna @ Stay Beautiful - www.modelmayhem.com/1273390
The Java leg of our trip. Started from Jakarta to Yogyakarta by train, to Mt. Bromo and from there to Surabaya
Pictures taken on Java-Eiland in Amsterdam, which underwent major renovation and residential buildings have been erected.
The glass panels are all situated on the right half of the windows, even the lowest panel is in line with that.
6th JUNE, LONDON – The London Java Community meet for a technical session by Ian Ashworth. Showing how development testing and static analysis will help developers find critical defects in code development and accelerate the time to market. See the SkillsCast (film, code, slides) at: skillsmatter.com/podcast/java-jee/java-development-testin...
The Java leg of our trip. Started from Jakarta to Yogyakarta by train, to Mt. Bromo and from there to Surabaya
Inheritance in Java is one of the most important features of an Object-oriented programming system(OOPs). We have seen an overview of inheritance in the previous tutorial of OOPs concepts in Java. In this tutorial, we will understand in detail about inheritance in java and its type with various examples.
What is inheritance in Java
Inheritance in java is a feature that helps to reuse the methods and variables of one class in another class. In other words, it allows a new class to inherit the properties and functions of an existing class without rewriting the code. It implements the parent-child relationship. This means that the child class can directly reuse the variables and functions of the parent class.
Terminologies in Java inheritance
Below are the common terms used with respect to inheritance in java.
Superclass - It is the parent class or base class from which a new class inherits the properties or methods.
Subclass - The class that extends the parent class is a subclass or child class.
extends - a keyword that supports inheritance
super - a keyword that denotes a method, constructor, or variable of a parent class.
Features of Inheritance
- Ability to reuse the existing code of a class
- Supports method overriding
- Allows calling methods of superclass within methods of a subclass using super keyword.
- Does not allow to inherit the final class or override final methods.
- Supports multiple inheritance using interfaces.