Scala之Set、Map、TreeSet及TreeMap实例

1、代码

package com.yy.base
import scala.collection.mutable
import scala.collection.mutable.TreeSet
import scala.collection.immutable.TreeMap

/**
 * Set、Map、TreeSet、TreeMap实例
 */
object SetMapOps extends App {
  println("Set Test:")
  val data = mutable.Set.empty[Int]
  data ++= List(1,2,3,4)
  println(data)
  data += 5
  println(data)
  data --= List(1,2)
  println(data)
  data += 3
  println(data)
  data.clear()
  println(data) 
  
  println("Map Test:")
  val map = mutable.Map.empty[String,String]
  map("name") = "yy"
  map("address") = "bj"
  println(map)
  println("name:"+map.get("name"))
  println("address:" + map("address"))
  
  println("TreeSet Test:")
  val treeSet = TreeSet(3,2,1,5,7,6,4)
  println(treeSet) //排序后
  
  println("TreeMap Test:")
  val treeMap = TreeMap("name"->"yy","address"->"bj")
  println(treeMap) //排序后
}

2、结果

Set Test:
Set(1, 2, 3, 4)
Set(1, 5, 2, 3, 4)
Set(5, 3, 4)
Set(5, 3, 4)
Set()
Map Test:
Map(address -> bj, name -> yy)
name:Some(yy)
address:bj
TreeSet Test:
TreeSet(1, 2, 3, 4, 5, 6, 7)
TreeMap Test:
Map(address -> bj, name -> yy)