What is the difference between abstract class and interfaces?
Answers
Answer:
Main Difference
The main difference between abstract class and interface is that the procedures of Java interface are essentially abstract and cannot have applications. So broadly stating, interface is actually a contract and when we talk about interface, it applies that the methods do not have a body, it is just a pattern. While abstract classes are basically the classes which are expensive to use. Abstract classes and interface is a whole different concept, these are two different things but at times their implementations are quite similar.
More Differences
An abstract class is object orientated while interface is function oriented.
When you want API to stay constant for a while then you choose interface over abstract class.
Multiple inheritances could be gained by implying multiple interfaces. While in abstract class, you cannot get multiple inheritances.
If you have a vibe that you in future you would need to add methods in your work then abstract class is opted, not interface.
Abstract class gives a common base class application but nothing of such happens in interface.
In interface, all the methods you implement are public but in abstract class you can also apply some non-public methods.
Constructors are not there in interface but they do occur in abstract class.
Complete member of abstract class could be static but not of interface.
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