20.scala编程思想笔记——Vector

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  Vector是一个容器，即保存其他对象的对象。容器也称为集合。Vector是标准Scala包的一部分，不需要任何导入就可以使用。

如下：

         importcom.atomicscala.AtomicTest._

 

// A Vector holds other objects:

val v1 = Vector(1, 3, 5, 7, 11, 13)

v1 is Vector(1, 3, 5, 7, 11, 13)

 

v1(4) is 11 // "Indexing" into a Vector

 

// Take each element of the Vector:

var result = ""

for(i <- v1) {

  result += i +" "

}

result is "1 3 5 7 11 13 "

 

val v3 = Vector(1.1, 2.2, 3.3, 4.4)

// reverse is an operation on the Vector:

v3.reverse is Vector(4.4, 3.3, 2.2, 1.1)

 

var v4 = Vector("Twas","Brillig", "And",

               "Slithy", "Toves")

v4 is Vector("Twas", "Brillig","And",

       "Slithy", "Toves")

v4.sorted is Vector("And","Brillig",

       "Slithy", "Toves", "Twas")

v4.head is "Twas"

v4.tail is Vector("Brillig","And",

       "Slithy", "Toves")

Scala允许我们构建无需使用new就可以被实例化的类。

[root@localhost examples]# scala -nocompdaemonVectors.scala

Vector(1, 3, 5, 7, 11, 13)

11

1 3 5 7 11 13

Vector(4.4, 3.3, 2.2, 1.1)

Vector(Twas, Brillig, And, Slithy, Toves)

Vector(And, Brillig, Slithy, Toves, Twas)

Twas

Vector(Brillig, And, Slithy, Toves)

关于Vector的更多信息，可以查看ScalaDoc。