scala入门初级代码训练-38setMapTreeMapTreeSet
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原文地址： http://www.ptbird.cn/2016/07/19/scala-chuji-demo-38/
There I am,in the world more exciting!
package com.ptbird.scala
import scala.collection.immutable.{TreeMap, TreeSet}
import scala.collection.mutable
/**
* Created by postbird on 2016/5/26.
*/
object SetMapTreeSetMapTest {
def main(args: Array[String]): Unit = {
val data = mutable.Set.empty[Int]
data ++= List(1, 2, 3)
data += 4
data --= List(2, 3)
println(data)
// Set(1, 4)
data += 1
println(data) //Set(1, 4)
/**
* set的元素是不能重复的 从而能够进行比较
* */
data.clear()
println(data) //Set()
val map = mutable.Map.empty[String, String]
map("java") = "Hadoop"
map("scala") = "Spark"
println(map)
//Map(scala -> Spark, java -> Hadoop)
println(map("java"))
//Hadoop
val treeSet = TreeSet(2, 3, 4, 1, 6, 8, 7)
println(treeSet)
//TreeSet(1, 2, 3, 4, 6, 7, 8)
val treeMap = TreeMap("scala" -> "Spark", "java" -> "Hadoop")
println(treeMap)
//Map(java -> Hadoop, scala -> Spark)
}
}
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