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)    }   }