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Difference between interface and abstract class

213 views · Published 6 February 2014 · 2:18 · Indexed 6 November 2026

Channel: Interview DOT · 2014 · Science & Technology

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What is the difference between interface and abstract class ? Java Interview Question And Answer ?

What is the difference between interface and abstract class ?

        Interface contains methods that must be abstract; abstract class may contain concrete methods.

        Interface contains variables that must be static and final; abstract class may contain non-final and final variables.

        Members in an interface are public by default, abstract class may contain non-public members.

        Interface is used to "implements"; whereas abstract class is used to "extends".

        Interface can be used to achieve multiple inheritance; abstract class can be used as a single inheritance.

        Interface can "extends" another interface, abstract class can "extends" another class and "implements" multiple interfaces.

        Interface is absolutely abstract; abstract class can be invoked if a main() exists.

        Interface is more flexible than abstract class because one class can only "extends" one super class, but "implements" multiple interfaces.

        If given a choice, use interface instead of abstract class. 
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Difference between interface and abstract class

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