val set = Set(1, 2, 3) //不可变

println(set)

import scala.collection.mutable.Set

val mutableSet = Set(1, 2, 3) //可变

import scala.collection.mutable

object ScalaSet01 {

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

    val set01 = Set(1,2,4,"abc")

    println(set01)

    val set02 = mutable.Set(1,2,4,"abc")

    println(set02)

  }

}

val set02 = mutable.Set(1,2,4,"abc")

set02.add(90)

set02 += 78

set02 += 90

println(set02)

val set02 = mutable.Set(1,2,4,"abc")

set02 -= 2 // 操作符形式

set02.remove("abc") // 方法的形式，scala的Set可以直接删除值

println(set02)

说明：说明：如果删除的对象不存在，则不生效，也不会报错

val set02 = mutable.Set(1, 2, 4, "abc")

for(x <- set02) {

println(x)

}