输入输出
package org.fool.scala import scala.io.StdIn object AppTest { def main(args: Array[String]): Unit = { val name = StdIn.readLine("Your name: ") println(name) print("Your age: ") val age = StdIn.readInt() println(age) } }
console output
Your name: Scala Scala Your age: 30 30
循环
package org.fool.scala object AppTest { def main(args: Array[String]): Unit = { var n = 10 while(n > 0) { print(n + " ") n -= 1 } println("\n----------------------------------") for(i <- 1 to 10) { print(i + " ") } println("\n----------------------------------") for(i <- 1 to 3; j <- 1 to 3) print(i * j + " ") } }
console output
10 9 8 7 6 5 4 3 2 1 ---------------------------------- 1 2 3 4 5 6 7 8 9 10 ---------------------------------- 1 2 3 2 4 6 3 6 9
默认参数和带名参数
package org.fool.scala object AppTest { def main(args: Array[String]): Unit = { val defaultResult = getResult("Scala") println(defaultResult) val result = getResult("Scala", "(", ")") println(result) } def getResult(result: String, left: String = "[", right: String = "]") = left + result + right }
console output
[Scala] (Scala)
可变长度参数
package org.fool.scala object AppTest { def main(args: Array[String]): Unit = { val s1 = sum(1, 2, 3) println(s1) val s2 = sum(1, 2, 3, 4, 5) println(s2) val s3 = sum(1 to 10: _*) println(s3) } def sum(args: Int*) = { var result = 0 for (arg <- args) result += arg result } }
console output
6 15 55