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並前往https://youtrack.jetbrains.com/issue/KT-10370/Default-methods-from-java.util.Map-unavailable-in-Kotlin-for-MutableMap

Default methods from java.util.Map unavailable in Kotlin for ...

MutableMap doesn't have computeIfAbsent method, and there is no equivalent for that method in Kotlin stdlib (MutableMap.getOrPut has a parameterless producer).

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