scala之信息甄别、模式匹配

scala之信息甄别、模式匹配

scala模式匹配

代码

import scala.util.Random//做一个信息的甄别
object Patter2 {def main(args: Array[String]): Unit = {abstract class NotFaction//定义不同信息的样例类case class Email(send:String,title:String,body:String) extends NotFactioncase class SMS(caller:String,message:String) extends NotFactioncase class VoiceRecording(contactName:String,link:String) extends NotFaction//信息识别def showNotFaction(notifiction:NotFaction):String={notifiction match {case  Email(send, title,_)if(send=="张三")=>"you get a Email message from"+sendcase SMS(caller, message)=>"you get a SMS message from"+callercase VoiceRecording(contactName, link)=>"you get a VoiceRecording message from"+contactNamecase _=>"you get a message not important"}}//创建一条信息val email1=Email("张三","important","some xxixxxx")val email2=Email("李四","important","some xxixxxx")println(showNotFaction(email1))println(showNotFaction(email2))//类型匹配val arr=Array("Bob",2,3.4,'d')//随机取数组元素val obj=Int(4))println(obj)obj match{case x:Int=>println(x)case s:String=>UpperCase())case d:Double =>println(Int.MaxValue)case _=>println("fail")}}
}

运行结果

you get a Email message from张三
you get a message not important
3.4
2147483647Process finished with exit code 0

you get a Email message from张三
you get a message not important
d
failProcess finished with exit code 0