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BU ShehuiBU Shehui
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Fixed Ch6
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ch6_3.md

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title: Java语言面向对象
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[TOC]
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#对象的定义和使用
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在程序中创建对象的目的是使用对象。<br>
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本文档 Github :
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https://github.com/bushehui/Java_tutorial
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ch6_4.md

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4.什么叫抽象类?抽象类有什么设计要求?
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5.什么叫最终类?最终类有何设计要求?
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6.先设计一个长方形类,再通过继承长方形类设计一个正方形类,正方形类中通过覆盖父类的方法得到一些新的功能。
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本文档 Github :
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https://github.com/bushehui/Java_tutorial
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