scala 陣列ArrayBuffer
阿新 • • 發佈:2019-02-05
scala> import scala.collection.mutable.ArrayBuffer import scala.collection.mutable.ArrayBuffer scala> val arrBuffer=ArrayBuffer[Int]() arrBuffer: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer() scala> arrBuffer+=10 res6: arrBuffer.type = ArrayBuffer(10) scala> arrBuffer res7: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10) scala> arrBuffer+=(11,1,3,4,5) res8: arrBuffer.type = ArrayBuffer(10, 11, 1, 3, 4, 5) scala> arrBuffer++=Array(1,2,3,4) res9: arrBuffer.type = ArrayBuffer(10, 11, 1, 3, 4, 5, 1, 2, 3, 4) scala> arrBuffer.trim trimEnd trimStart scala> arrBuffer.trimEnd(3) scala> arrBuffer res11: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 5, 1) scala> arrBuffer.insert(5,100) scala> arrBuffer res13: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 5, 1) scala> arrBuffer.insert(7,9,2,444,5) scala> arrBuffer res15: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 5, 9, 2, 444, 5, 1) scala> arrBuffer.remove(10) res16: Int = 5 scala> arrBuffer res17: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 5, 9, 2, 444, 1) scala> arrBuffer.remove(6) res18: Int = 5 scala> arrBuffer res19: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 9, 2, 444, 1) scala> arrBuffer.remove(6,3) scala> arrBuffer res25: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 1) scala> arrBuffer.toArray res26: Array[Int] = Array(10, 11, 1, 3, 4, 100, 1) scala> val arr2=arrBuffer.toArray arr2: Array[Int] = Array(10, 11, 1, 3, 4, 100, 1) scala> arr2.toBuffer res27: scala.collection.mutable.Buffer[Int] = ArrayBuffer(10, 11, 1, 3, 4, 100, 1)