Interface And Abstract Class in Java 8 Differences

Publié le: 26 janvier 2014
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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.

Interface And Abstract Class in Java 8 Differences

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