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Java / Abstract Class

Java 8, difference between abstract class and Interface.

Both abstract class and interface are used for abstraction by hiding the internal implementation of the feature and only showing the functionality to the users.

method types: Interface can have only abstract methods. From Java 8, interface can have default and static methods also. Abstract class can have abstract and non-abstract methods.

Final Variables: Variables declared in a Java interface are by default final. An abstract class may contain non-final variables.

Type of variables: Abstract class can have final, non-final, static and non-static variables. Interface has only static and final variables.

Accessibility of Data Members: Members of a Java interface are public by default. A Java abstract class can have class members like private, protected, etc.

Implementation: Abstract class can provide the implementation of interface while Interface cannot provide the implementation of abstract class.

Inheritance vs Abstraction: A Java interface can be implemented using keyword "implements" and abstract class can be extended using keyword "extends".

Multiple implementation: An interface can extend another Java interface only, an abstract class can extend another Java class and implement multiple Java interfaces.

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