scala

• scala命令行交互

:paste

結束：ctrl + d

• print和println區別：println後面會自動換行

scala> print("Hello World")
Hello World
scala> println("Hello World")
Hello World

scala>

• ArrayBuffer()添加元素，使用 += 操作符

scala> import scala.collection.mutable.ArrayBuffer
import scala.collection.mutable.ArrayBuffer

scala> var b = ArrayBuffer[Int]()
b: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer()

scala> b += 1
res16: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1)

scala> b(0)
res18: Int = 1

scala> b += 100
res19: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 100)

scala> b(1)
res20: Int = 100