Scala抽象类型

 1 package big.data.analyse.scala
 2 
 3 import scala.io.{BufferedSource, Source}
 4 
 5 /**
 6   * 抽象类型
 7   * Created by zhen on 2019/1/6.
 8   */
 9 trait Reader{
10   type url <: java.io.Serializable
11   type content
12   def reader(fileUrl : url) : content
13 }
14 class FileReader extends Reader{
15   type url = String
16   type content = BufferedSource
17   override def reader(fileUrl : url) = Source.fromFile(fileUrl)
18 }
19 object AbstractType {
20   def main(args: Array[String]) {
21     val fileReader = new FileReader
22     val source = fileReader.reader("C:/Users/zhen/.spyder-py3/发布模块/setup.py")
23     for(line <- source.getLines()){
24       println(line)
25     }
26   }
27 }

结果：