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<!doctype html>
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<a href="https://github.com/ffeiko"><img style="position: absolute; top: 0; left: 0; border: 0;" src="https://camo.githubusercontent.com/c6625ac1f3ee0a12250227cf83ce904423abf351/68747470733a2f2f73332e616d617a6f6e6177732e636f6d2f6769746875622f726962626f6e732f666f726b6d655f6c6566745f677261795f3664366436642e706e67" alt="Fork me on GitHub" data-canonical-src="https://s3.amazonaws.com/github/ribbons/forkme_left_gray_6d6d6d.png"></a>
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java抽象类包含抽象方法的类就做抽象类.如果一个类包含一个或多个抽象方法,该类必须被限定为抽象类.
java接口在JAVA编程语言中是一个抽象类型，是抽象方法的集合，接口通常以interface来声明。一个类通过继承接口的方式，从而来继承接口的抽象方法。
1.通过继承来扩展接口1234567891
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