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@kmizu
Last active November 29, 2018 02:13
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ScalaとJavaの境界におけるnullの扱い方 ref: https://qiita.com/kmizu/items/e4c7473f9ed831b5a1de
import java.util
def useMap(config: util.Map[String, String]): Unit = {
// "version" に対応する値が必ずあるとわかっているとする
val version = config.get("version")
...
}
import java.util
def useMap(config: util.Map[String, String]): Unit = {
assert(config.containsKey("version"))
val version: String = config.get("version")
...
}
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