Type safety: The expression of type List needs unchecked conversion to conform to List＜TagFormal＞
报这个错，如果代码没错只需要加
@SuppressWarnings("unchecked")
就行了
解释一:
屏蔽某些编译时的警告信息
在强制类型转换的时候编译器会给出警告
加上
程序代码
@SuppressWarnings("unchecked")
安全警告，可以用它来消除
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