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当有关键字synchronized时，为何IDEA建议用Collections.unmodifiableSet？

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当有关键字synchronized时，为何IDEA建议用Collections.unmodifiableSet？

有关键字synchronized用在set上时
image.png

idea总是建议如下：

image.png

为什么要这样？


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报错内容是说“用方法参数或者局部变量做synchronized很难保证逻辑正确，建议换class或者field做synchronized”
第二段代码里换成一些其他操作一样可以消除这个警告，估计是idea已经彻底无法理解这个操作是要干啥了


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