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集合转Map抛出异常的常见情形提醒

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docs/java/collection/java-collection-precautions-for-use.md
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@ -134,6 +134,7 @@ public static <T> T requireNonNull(T obj) {
return obj; return obj;
} }
``` ```
> `Collectors`也提供了无需mergeFunction的`toMap()`方法，但此时若出现key冲突，则会抛出`duplicateKeyException`异常，因此强烈建议使用`toMap()`方法必填mergeFunction。
## 集合遍历 ## 集合遍历