diff between abstract class and interface php
Can a class implement multiple interfaces?
A class can implement multiple interfaces. A child class can define abstract methods with the same or less restrictive visibility, whereas class implementing an interface must define all interface methods as public. Abstract Classes can have constructors but not interfaces. Interfaces from Java 9 have private static methods.
What is the difference between a concrete class and an abstract class?
When inheriting an abstract class, a concrete child class must define the abstract methods, whereas an abstract class can extend another abstract class and abstract methods from the parent class don't have to be defined. Similarly, an interface extending another interface is not responsible for implementing methods from the parent interface.
What is the difference between a subclass and an interface?
Subclasses use extends keyword to extend an abstract class and they need to provide implementation of all the declared methods in the abstract class unless the subclass is also an abstract class whereas subclasses use implements keyword to implement interfaces and should provide implementation for all the methods declared in the interface.
What is the difference between abstract class and interface?
But there are many differences between abstract class and interface that are given below. 1) Abstract class can have abstract and non-abstract methods. Interface can have only abstract methods. Since Java 8, it can have default and static methods also. 2) Abstract class doesn't support multiple inheritance. Interface supports multiple inheritance.
Introduction
Abstraction is one of the Object-Oriented programming key features. It allows us to hide the implementation complexities just by providing functionalities via simpler interfaces. In Java, we achieve abstraction by using either an interface or an abstract class. In this article, we’ll discuss when to use an interface and when to use an abstract clas
Class vs. Interface
First, let’s look at the differences between a normal concrete class vs. an interface. A class is a user-defined type that acts as a blueprint for object creation. It can have properties and methods that represent the states and behaviors of an object, respectively. An interface is also a user-defined type that is syntactically similar to a class.
Interface vs. Abstract Class
An abstract class is nothing but a class that is declared using the abstract keyword. It also allows us to declare method signatures using the abstractkeyword (abstract method) and forces its subclasses to implement all the declared methods. Suppose if a class has a method that is abstract, then the class itself must be abstract. Abstract classes h
When to Use An Interface
Let’s look at some scenarios when one should go with an interface: 1. If the problem needs to be solved using multiple inheritances and is composed of different class hierarchies 2. When unrelated classes implement our interface. For example, Comparable provides the compareTo()method that can be overridden to compare two objects 3. When application
When to Use An Abstract Class
Now, let’s see some scenarios when one should use the abstract class: 1. When trying to use the inheritance concept in code (share code among many related classes), by providing common base class methods that the subclasses override 2. If we have specified requirements and only partial implementation details 3. While classes that extend abstract cl
Conclusion
This article discussed the overview of interfaces and abstract classes and the key differences between them. Also, we examined when to use each of them in our work to accomplish writing flexible and clean code. The complete source code for the examples given in this article is available over on GitHub. baeldung.com
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