无法在 Scala 中将字符串转换为 long
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Cannot convert string to a long in scala
提问by Programmerr
Why can I not convert the following string into a long? i am trying to do this in scala.
为什么我不能将以下字符串转换为长字符串？我想在 Scala 中做到这一点。
var a = "153978017952566571852"
val b = a.toLong
when I try to convert it I get the NumberFormatException
当我尝试转换它时，我得到 NumberFormatException
回答by Psidom
Because the number exceeds the limit of Long Integer which goes from -9223372036854775808 to 9223372036854775807, with maximum of 19 digits, while your string contains 21 digits.
因为数字超过了 Long Integer 的限制，从-9223372036854775808 到 9223372036854775807，最多 19 位，而您的字符串包含 21 位。
You can convert it to Floator Doubleif you don't have to be exact:
如果您不必精确，您可以将其转换为Float或Double：
scala> val b = a.toFloat
b: Float = 1.5397802E20
scala> val b = a.toDouble
b: Double = 1.5397801795256658E20
