Scala的字符串

发布于:2024-11-28 ⋅ 阅读:(13) ⋅ 点赞:(0)
package hfd.test32

import java.io.PrintWriter
import scala.io.Source

object Test {
  def main(args: Array[String]): Unit = {
    //从文件1.txt中,读入内容
    val content = Source.fromFile("1.txt").mkString
    println(content)

    //把字符串中的每个单词,拆出来
    // \\W+:答谢字符串表示:非字(不是一个字的字符,列如:空格,逗号,句号,换行。。。)
    //+:一个或者多个
    val arr = content.split("\\W+")
      arr.foreach(println)
    //如果有一个字符串数组:
    // val arr1=  Array("thank","you","very","much","very")

    val m1 = scala.collection.mutable.Map[String, Int]()
    arr.foreach(word => {
      //检查是否出现?
      if (m1.contains(word)) {
        //把票数+1
        m1(word) += 1
      } else {
        //票数为1
        m1(word) = 1

      }
    })
    //对于m1,他是一共Map(thank:10,is:5),现在需要对它进行排序,把出现次数最多的放在最前面,然后再输出
    //(thank,10)
    //只要排序之前的结果的前15个?在List中取出前15个?
    val sortedM1 = m1.toList.sortWith((a, b) => a._2 > b._2).filter(a => a._1.length > 2).slice(0, 15)
    //输出排序后的Map
   // sortedM1.foreach { case (word, cishu) => println(s"${word}:${cishu}") }
    //把结果保存到一个新的文件中
    val writer = new PrintWriter("3.txt")
   writer.println("统计的结果为:")
    sortedM1.foreach{case (word,cishu)=>writer.println(s"${word}:${cishu}")}
    writer.close()//结束写入
    //thank:2
    // you:1
    //very:2
    //much:1
  }
}