一.Set
1.set集合创建以及方法

package zjcobject test05 {def main(args: Array[String]): Unit = {val set=Set[Int](1,2,3,4)val set1=Set[Int](2,3,4,5)val value: Set[Int] = set.intersect(set1)value.foreach(println)println("============")val value1: Set[Int] = set.diff(set1)   //set独有的元素val value2: Set[Int] = set1.diff(set)   //set1独有的元素value1.foreach(println)println("============")value2.foreach(println)println("============")val value3: Set[Int] = set.filter(elem => elem > 2)  //过滤器value3.foreach(println)println("============")val array: Array[Int] = set1.toArray  //转为数组array.foreach(println)println("===========")val list: List[Int] = set1.toList     //转为Listlist.foreach(println)}
}

2.可变长 set
引入这个包就是可变Set

import scala.collection.mutable.Set
object test05 {def main(args: Array[String]): Unit = {val set=Set[Int](1,2,3,4,5)set.+=(100)set.+=(200)set.foreach(println)}
}

二.Map
1.Map各方法

package zjcobject test05 {def main(args: Array[String]): Unit = {val map=Map(1->"zjc",2->"lff",(3,"zjc"),(3,"ergou")  //key相同时，后一个会覆盖前一个)println(map.get(1).get)println("==============")val keyleterable=map.keys   //遍历map的keykeyleterable.foreach(println)println("===============")val valueterable =map.values  //遍历map的valuevalueterable.foreach(println)println("===============")val map1=Map((4,"feifei"),(5,"efx"),(6,"zxy"))map.++:(map).foreach(println)  //合并mapprintln("================")}
}

2.可变长map

import scala.collection.mutable.Map
object test06 {def main(args: Array[String]): Unit = {val map=Map[Int,String]()map.put(1,"zjc")map.put(2,"lff")}
}