Java Scala读取文件并拆分和修改每一行
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Scala read file and split and modify each line
提问by macemers
I'm new to Scala. I want to read lines from a text file and split and make changes to each lines and output them.
我是 Scala 的新手。我想从文本文件中读取行并拆分并更改每一行并输出它们。
Here is what I got:
这是我得到的：
val pre:String = " <value enum=\""
val mid:String = "\" description=\""
val sur:String = "\"/>"
for(line<-Source.fromFile("files/ChargeNames").getLines){
var array = line.split("\"")
println(pre+array(1)+mid+array(3)+sur);
}
It works but in a Object-Oriented programming way rather than a Functional programming way.
它以面向对象的编程方式而不是函数式编程方式工作。
I want to get familiar with Scala so anyone who could change my codes in Functional programming way?
我想熟悉 Scala，以便任何可以以函数式编程方式更改我的代码的人？
Thx.
谢谢。
采纳答案by 1esha
One traversal and no additional memory
一次遍历，无需额外内存
Source
.fromFile("files/ChargeNames")
.getLines
.map { line =>
//do stuff with line like
line.replace('a', 'b')
}
.foreach(println)
Or code which is a little bit faster, according to @ziggystar
或者根据@ziggystar 的说法，代码稍微快一点
Source
.fromFile("files/ChargeNames")
.getLines
.foreach { line =>
//do stuff with line like
println(line.replace('a', 'b'))
}
回答by stewSquared
val ans = for (line <- Source.fromFile.getLines) yield (line.replace('a', 'b')
ans foreach println
