object test {def main(args: Array[String]): Unit = {val id ="42032220080903332x"//1.生日是？//字符串截取val birthday =id.substring(10,14) //不包括终点下标println(birthday)val year =id.substring(6,10)  //println(year)//性别：倒数第2位//如果是奇数:boy,偶数:girlval gender = id.charAt(16)println(gender)if(gender.toInt % 2 ==0) {println("性别是：女生")}else {println("性别是:男生")}//前两位表示省份val province = id.substring(0,2).toIntval m1 = Map((41,"河南"),(42,"湖北"),(43,"湖南"),(44,"广东"))println(s"籍贯是:${m1.get(province)}")//验证身份证号是否合法//每一位的积重val weights =Array(7,9,10,5,8,4,2,1,6,3,7,9,10,5,8,4,2)val checkCodes ="10x98765432"var sum = 0for (i <- 0 to 16){sum += id(i).toInt * weights(i)}if(id.charAt(17)==checkCodes.charAt(sum%11)){println(s"校检成功")}else{println(s"校检失败")}val str1 ="""|静夜思|李白|床前明月光|疑是地上霜|"""}}

map的遍历

import scala.io.Sourceobject test32 {def main(args: Array[String]): Unit = {val content = Source.fromFile("1.text").mkStringprintln(content)//把字符串中的每个单词，拆出来//正则表达式//\\W+:大学字符串表示：非字(不是一个的字符。例如：空格 逗号 句号 换行...)//+:一个或者多个val arr =content.split("\\W+")  //arr.foreach(println)//如果有一个字符串组：val arr1 =Array("thank","you","very","much","thank","very")val m1 =scala.collection.mutable.Map[String,Int]()arr1.foreach(word =>{//检查是否出现过？if (m1.contains(word)){//把票数+1m1(word) += 1}else {//票数为12}})//对于m1，它是一个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m1.foreach{case (word,cishu) => println(s"${word}:${cishu}")}}}

补充