由于JDK版本不同部分代码实现有所变动（ArrayList） #218
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"所以 ArrayList 每次扩容之后容量都会变为原来的 1.5 倍！ 记清楚了！不是网上很多人说的 1.5 倍+1！" 修改为 “所以 ArrayList 每次扩容之后容量都会变为原来的 1.5 倍！（JDK1.6版本以后）** JDk1.6版本时，扩容之后容量为 1.5 倍+1！”
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建议指明源码JDK版本，关于扩容问题进行补充说明，在JDK1.6版本时，扩容为1.5 + 1，而JDK1.7，JDK1.8时，为扩容1.5倍。