4、scala学习 tuple Array Map
更多干货
tuple
def main(args: Array[String]): Unit = {
val triple = (100, "Scala", "Spark")
println(triple._1)
println(triple._2)
println(triple._3)
}
Array
def main(args: Array[String]) {
val array = Array(1, 2, 3, 4, 5)
// for(i <- 0 until array.length){
// println(array(i))
// }
for (elem <- array) println(elem)
}
Map
object MapOperations {
def main(args: Array[String]) {
val ages = Map("Rocky" -> 27, "Spark" -> 5)
// for((k,v) <- ages){
// println("Key is " + k + ",value is " + v)
// }
for ((k, _) <- ages) { //placeholder
println("Key is " + k)
}
}
}
File
import scala.io.Source
object FileOps {
def main(args: Array[String]) {
// val file = Source.fromFile("E:\\ctoedu.txt")
val file = Source.fromURL("http://spark.apache.org/")
for (line <- file.getLines) {
println(line)
}
}
}