What’s the difference between the following keywords in Java: implements, extends?
What’s the difference between the following keywords in Java: implements , extends ?
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What’s the difference between the following keywords in Java: implements, extends?
An
interfaceis an abstract specification of how aclassshould behave whilst aclassis a concrete implementation of such a specification.Therefore, when you write
implementsyou’re saying that you are fulfilling some abstract specification in the implementation you’ve written.extendsmeans that you take either an implementation (class) or specification (interface) and add to it with different or new functionality (or change the specification of its behaviour), thus modifying its behaviour and extend-ing it.