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Merge pull request #654 from rocky-peng/patch-2

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纠正HashMap进行entry遍历的说法
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SnailClimb 2020-02-29 20:07:11 +08:00 committed by GitHub
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docs/java/collection/HashMap.md
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@ -512,7 +512,8 @@ public class HashMapDemo {
} }
/** /**
* 另外一种不常用的遍历方式 * 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。
* 一次是在获取keySet的时候，一次是在遍历所有key的时候。
*/ */
// 当我调用put(key,value)方法的时候，首先会把key和value封装到 // 当我调用put(key,value)方法的时候，首先会把key和value封装到
// Entry这个静态内部类对象中，把Entry对象再添加到数组中，所以我们想获取 // Entry这个静态内部类对象中，把Entry对象再添加到数组中，所以我们想获取