abstract class vs interface java geeksforgeeks

Published: 01 December 2024
on channel: CodeNode

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certainly! in java, both abstract classes and interfaces are used to achieve abstraction, but they serve different purposes and have different features. here’s a comprehensive tutorial on the differences between abstract classes and interfaces, along with code examples.

abstract classes vs interfaces in java

abstract class

an abstract class is a class that cannot be instantiated on its own and may contain abstract methods (methods without a body) as well as concrete methods (methods with an implementation). abstract classes are used when you want to provide a common base for a group of related classes.

*key points:*
an abstract class can have both abstract methods and concrete methods.
an abstract class can have member variables and constructors.
it can provide default behavior (implementation) for some methods.
a class can extend only one abstract class (single inheritance).

*example:*

interface

an interface is a reference type in java, similar to a class, that can contain only constants, method signatures, default methods, static methods, and nested types. interfaces cannot contain instance fields or constructors. they are used to represent a contract that implementing classes must follow.

*key points:*
an interface can only have abstract methods (until java 8, after which default and static methods were introduced).
interfaces cannot have instance variables (only static final variables).
a class can implement multiple interfaces (multiple inheritance).
interfaces are a way to achieve complete abstraction.

*example:*

key differences

| abstract class | interface |
|-----------------------------------------|-----------------------------------------|
| can have both abstract and concrete methods. | can only have abstract methods (until java 8, which allows default and static methods). |
| can have instance variables and constructors. | cannot have instance variables (onl ...

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