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add "Getters/Setters" link #61

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add "Getters/Setters" link #61

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2 changes: 1 addition & 1 deletion Part1/Android/Android性能优化.md
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Expand Up @@ -126,7 +126,7 @@ Tips:ArrayList手写的循环比增强型for循环更快，其他的集合没有
系统提供不了的Api完成不了我们需要的功能才应该自己去写，因为使用系统的Api很多时候比我们自己写的代码要快得多，它们的很多功能都是通过底层的汇编模式执行的。
举个例子，实现数组拷贝的功能，使用循环的方式来对数组中的每一个元素一一进行赋值当然可行，但是直接使用系统中提供的System.arraycopy()方法会让执行效率快9倍以上。

###避免在内部调用Getters/Setters方法
###[避免在内部调用Getters/Setters方法](https://developer.android.com/training/articles/perf-tips.html#GettersSetters)

面向对象中封装的思想是不要把类内部的字段暴露给外部，而是提供特定的方法来允许外部操作相应类的内部字段。但在Android中，字段搜寻比方法调用效率高得多，我们直接访问某个字段可能要比通过getters方法来去访问这个字段快3到7倍。但是编写代码还是要按照面向对象思维的，我们应该在能优化的地方进行优化，比如避免在内部调用getters/setters方法。

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