package com.ming.test

/**

 * 模式匹配

 */

object MatchTest {

    def main(args: Array[String]): Unit = {

      //match 基本用法

      var sign=3

      var m='w'

      var str='d'

      var digit="dsafdsafdsaf"

      m match{

        case '+' => sign=10

        case '-' => sign=100

        case _ => sign=200

      }

      println(sign)

      sign=m match{case '+' => 1000;case '-' => 10000;case _ => 1231}

      println(sign)

      //带有守卫的匹配

      sign=m match{case '+' => 12;case '-' =>23;case _ if Character.isDigit(m) =>2;case _ => 1000000}

      println(sign)

      //类型模式

      //var a=obj match{case x:Int=>x;case s : String => Integer.parseInt(s);case _:BigInt=>Int.MaxValue;case _ => 0}

      //数组匹配

      var array=Array(0,2)

      val s=array match{

        case Array(0)=>"0"

        case Array(x,y)=>x+" "+ y

        case Array(0,_*)=>"0 ......"

        case _ =>"something else"

      }

      println(s)

      //匹配列表

      val list=List(0,212,3)

      var lst=list match{

        case 0 :: Nil =>"0"

        case x :: y ::Nil => x+" "+ y

        case 0 :: tail => "0...."

        case _ =>"something else"

      }

      println(lst)

      //元祖匹配

      val yuanzu=(1,2,0)

      var zu=yuanzu match{

        case (0,_,1) => "0 ..."

        case (y,0,0) => y+"0"

        case _ => "neither is 0"

      }

      println(zu)

      //变量中声明中的模式

      val (x,y)=(1,2);

      println(x+y)

      //for 表达式中的模式

      for((k,v)<-Map((1,""),(2,3)) if v !="")println(k+"->"+v)

    }

}