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Commit eba95e7

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优化"HashMap和Hashtable的区别"一文
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‎contents/differences-between-hashmap-and-hashtable.md

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2. `Hashtable`不允许有空的键或值。`HashMap`允许空键和空值。
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3. HashMap有一个子类[LinkedHashMap](http://docs.oracle.com/javase/7/docs/api/java/util/LinkedHashMap.html),对这个类对象进行迭代时,它的顺序是有序的(按插入顺序排序)。如有需要,你也能轻易的从`LinkedHashMap`转化成`HashMap``Hashtable`就没那么简单了,
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总之,如果你无需关心同步(synchronized)问题,我会建议用`HashMap`。反之,你可以参考[ConcurrentHashMap](http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentHashMap.html)
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总之,如果你无需关心同步(synchronized)问题,我会建议用`HashMap`。反之,你可以考虑使用[ConcurrentHashMap](http://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ConcurrentHashMap.html)
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### stackoverflow链接:
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http://stackoverflow.com/questions/40471/differences-between-hashmap-and-hashtable

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