环境： CentOS 6.3

不解释，看例子，自己琢磨。

1. While 循环

$ cat while.scala
var i = 10;
while ( i > 0 ) {
 println("this is number " + i);
 i = i -1;
}

$ scala while.scala
this is number 10
this is number 9
this is number 8
this is number 7
this is number 6
this is number 5
this is number 4
this is number 3
this is number 2
this is number 1

2. foreach 循环

$ cat foreach.scala
var array=new Array[String](3)             //创建数组并初始化
array(0) = "hello"
array(1) = "nihao"
array(2) = "ma?"
array.foreach(arr => println(arr))        // 用foreach 循环输出数组内容  arr是指array里面每个元素的参数，scala 会推断是string

//array.foreach((arr:String) => println(arr))  //也可以显示指定arr类型

3. for 循环

$ cat for.scala
for(arg<-args)
  println(arg)
$ scala for.scala this is China
this
is
China

总结,函数式文本的语法：