import java.util.ArrayList;

import java.util.List;

public class School {

    public List<String> ls = null;

    public School() {

        ls = new ArrayList<String>();

        ls.add("abc");

        ls.add("efg");

    }

}

import collection.JavaConverters._

import com.citi.java.School

object CollectionDemo4 {

  def main(args: Array[String]): Unit = {

    //List转String,并且用，分隔

    println(List(1,2,3,4,5).mkString(", "))

    //List转ArrayBuffer

    println(List(1,2,3).toBuffer)

    //Map转List

    println(Map("a" -> 1, "b" -> 2).toList)

    //List转Map

    println(List("a" -> 1, "b" -> 2).toMap)

    println(List(("a",1), ("b", 2)).toMap)

    //Set转Map

    println(Set("a" -> 1, "b" -> 2).toMap)

    println(Set(("a",1), ("b",1)).toMap)

    //List转Set

    println(List(1,2,3).toSet)

    //Set转List

    println(Set(1,2,3).toList)

    //包括集合类型的String

    println(List(1,2,3).toString())

    //java集合类型转scala集合类型

    val s = new School()

    println(s.ls.asScala.toList)

  }

}