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Merge pull request Snailclimb#800 from WAYLON/master
修改错别字
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docs/java/collection/HashMap.md

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@@ -512,7 +512,7 @@ public class HashMapDemo {
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}
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/**
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* 如果既要遍历key又要value,那么建议这种方式,应为如果先获取keySet然后再执行map.get(key),map内部会执行两次遍历。
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* 如果既要遍历key又要value,那么建议这种方式,因为如果先获取keySet然后再执行map.get(key),map内部会执行两次遍历。
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* 一次是在获取keySet的时候,一次是在遍历所有key的时候。
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*/
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// 当我调用put(key,value)方法的时候,首先会把key和value封装到

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