Scala基础语法-3Map

Map(对偶元组)

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• 声明

val map = Map("a"->1, "b"->2)val map1 = Map(("a", 1),("b", 2))

默认import scala.collection.immutable.Map,所以不能改变值
map(“b”) = 22 会报错

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• 根据key获取value

println(map("b"))println(map.getOrElse("c", 0))> 2> 0

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• 修改key对应的value

map("b") = 22println(map("b"))> 22

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• 添加新元素

map("c") = 3map += (("d", 4), ("e", 5))map += ("e" -> 5)println(map)> Map(e -> 5, b -> 2, d -> 4, a -> 1, c -> 3, f -> 6)