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basics/java-basic/inheritance-composition.md

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@@ -57,11 +57,11 @@ Java是一个面向对象的语言。每一个学习过Java的人都知道,封
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> 继承要慎用,其使用场合仅限于你确信使用该技术有效的情况。一个判断方法是,问一问自己是否需要从新类向基类进行向上转型。如果是必须的,则继承是必要的。反之则应该好好考虑是否需要继承。《[Java编程思想][5]
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> 只有当子类真正是超类的子类型时,才适合用继承。换句话说,对于两个类A和B,只有当两者之间确实存在[`is-a`][1]关系的时候,类B才应该继续类A。《[Effective Java][6]
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> 只有当子类真正是超类的子类型时,才适合用继承。换句话说,对于两个类A和B,只有当两者之间确实存在[`is-a`][1]关系的时候,类B才应该继承类A。《[Effective Java][6]
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[1]: https://zh.wikipedia.org/wiki/Is-a
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[2]: http://www.hollischuang.com/wp-content/uploads/2016/03/Generalization.jpg
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[3]: https://en.wikipedia.org/wiki/Has-a
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[4]: http://www.hollischuang.com/wp-content/uploads/2016/03/Composition.jpg
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[5]: http://s.click.taobao.com/t?e=m%3D2%26s%3DHzJzud6zOdocQipKwQzePOeEDrYVVa64K7Vc7tFgwiHjf2vlNIV67vo5P8BMUBgoEC56fBbgyn5pS4hLH%2FP02ckKYNRBWOBBey11vvWwHXSniyi5vWXIZhtlrJbLMDAQihpQCXu2JnPFYKQlNeOGCsYMXU3NNCg%2F&pvid=10_125.119.86.125_222_1458652212179
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[6]: http://s.click.taobao.com/t?e=m%3D2%26s%3DwIPn8%2BNPqLwcQipKwQzePOeEDrYVVa64K7Vc7tFgwiHjf2vlNIV67vo5P8BMUBgoUOZr0mLjusdpS4hLH%2FP02ckKYNRBWOBBey11vvWwHXSniyi5vWXIZvgXwmdyquYbNLnO%2BjzYQLqKnzbV%2FMLqnMYMXU3NNCg%2F&pvid=10_125.119.86.125_345_1458652241780
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[6]: http://s.click.taobao.com/t?e=m%3D2%26s%3DwIPn8%2BNPqLwcQipKwQzePOeEDrYVVa64K7Vc7tFgwiHjf2vlNIV67vo5P8BMUBgoUOZr0mLjusdpS4hLH%2FP02ckKYNRBWOBBey11vvWwHXSniyi5vWXIZvgXwmdyquYbNLnO%2BjzYQLqKnzbV%2FMLqnMYMXU3NNCg%2F&pvid=10_125.119.86.125_345_1458652241780

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