Scala 可变数组 ArrayBuffer

最新推荐文章于 2024-05-06 12:52:54 发布

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最新推荐文章于 2024-05-06 12:52:54 发布

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本文介绍了Scala中ArrayBuffer的基本使用方法，包括如何创建、添加元素、批量添加数组元素、插入、删除及裁剪元素等操作，并提供了详细的代码示例。

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scala>

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

scala> val numbers = new ArrayBuffer[Int]()
numbers: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer()

scala> numbers += 1
res2: numbers.type = ArrayBuffer(1)

scala> numbers += 2
res3: numbers.type = ArrayBuffer(1, 2)

scala> numbers += (3,4)
res4: numbers.type = ArrayBuffer(1, 2, 3, 4)

scala> numbers += Array(5,6,7)
<console>:14: error: type mismatch;
 found   : Array[Int]
 required: Int
       numbers += Array(5,6,7)
                       ^

scala> numbers ++= Array(5,6,7)
res6: numbers.type = ArrayBuffer(1, 2, 3, 4, 5, 6, 7)

scala> numbers.insert(0,0)

scala> numbers
res8: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(0, 1, 2, 3, 4, 5, 6, 7)

scala> numbers.remove(0,0)

scala> numbers
res10: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(0, 1, 2, 3, 4, 5, 6, 7)

scala> numbers.remove(0)
res11: Int = 0

scala> numbers
res12: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2, 3, 4, 5, 6, 7)

scala> numbers.insert(0,0)

scala> numbers
res14: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(0, 1, 2, 3, 4, 5, 6, 7)

scala> numbers.remove(0,1)

scala> numbers
res16: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2, 3, 4, 5, 6, 7)

scala> numbers.trimEnd(3)

scala> numbers
res18: scala.collection.mutable.ArrayBuffer[Int] = ArrayBuffer(1, 2, 3, 4)

笔记：

将一个数组中所有元素添加到某个ArrayBuffer时，用 ++=

remove(0,1) 表示将0移除1次

remove(0,0) 表示将0移除0次

trimEnd(3) 表示从尾部切掉3个元素