Scala值类型和String类型转换

基本类型转换String

object TypeDemo15 {
  def main(args: Array[String]): Unit = {
    var a:Int = 5
    println((a+"").isinstanceOf[String])
  }
}

String 类型转基本类型

object TypeDemo16 {
  def main(args: Array[String]): Unit = {
    var s2:String = "12"

    var num1:Int = s2.toInt
    var num2:Float = s2.toFloat
    var num3:Double = s2.todouble
    var num4:Long = s2.toLong

    println(s2.isinstanceOf[String])

    println(num1.isinstanceOf[Int])
    println(num2.isinstanceOf[Float])
    println(num3.isinstanceOf[Double])
    println(num4.isinstanceOf[Long])
  }
}

注意事项

object TypeDemo14 {
  def main(args: Array[String]): Unit = {
    var s4 = "12.5"

    println(s4.toInt)  // 此处会报错
    println(s4.todouble.toInt)
  }

}