6.模式匹配
1.最基础的模式匹配
Java: 对一个值进行条件判断,返回针对不同的条件进行不同的处理
Scala:
变量 match {case value1 =>代码1,case value2 =>代码2, ... case _ => 代码N }
object MatchApp extends App { val names = Array("zhangsan","lisi","wangwu") val name = names(Random.nextInt(names.length)) name match {case "zhangsan" => println("张三...")case "lisi" => println("李四...")case _ => println("真的不知道你们在说什么") } }
2.加条件进行匹配
3.Array模式匹配
def greeting(array:Array[String])={ array match{case Array("zhangsan") => println("Hi zhangsan")case Array(x,y) => println("Hi "+x+" , "+y)case Array("zhangsan",_*) => println("Hi zhangsan and other friends")case _ => println("Hi everybody") } }
4.List模式匹配
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5.类型匹配
def matchType(obj:Any)={ obj match {case Int => println("Int")case String => println("String")case m:Map[_,_] => m.foreach(println)case _ => println("other type") } }
6.Scala异常处理
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7.case class
class Personcase class CTO(name: String,floor:Int) extends Personcase class Employee(name: String,floor:Int) extends Personcase class Other(name:String) extends Persondef caseclassMatch(person: Person)={ person match{case CTO(name,floor) => println("CTO name is "+name+", floor is "+floor)case Employee(name,floor) => println("Employee name is "+name+", floor is "+floor)case _ => println("other") } }
作者:Meet相识_bfa5
链接:https://www.jianshu.com/p/deeb1e4df332