有時在Scala中調用Java的庫，Java庫會返回某些Java的集合或類型，必須經過一些轉換才能正常使用。
否則有可能在編譯的過程遇到這個錯誤。
錯誤字符串
下面是錯誤的主要信息。
Scala Java Error: value filter is not a member of *
解決辦法
在代碼中引入下面名字空間，引用Java和Scala的各種集合和類型之間的隱式轉換。
import collection.JavaConversions._
Scala Java Error: value filter is not a member of *
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