Scala中的match(模式匹配)

/**

• 模式匹配 */ case class Class1(param1: String, param2: String)

case class Class2(param1: String)

object Case { def main(args: Array[String]) { //通过模式匹配进行条件判断 val test1: String = "1" val result1 = test1 match { case "1" => { "one" } case "2" => "two" case _ => "other" } println(result1)

1//通过模式匹配进行条件判断，可自定义条件
2val test2: Int = 1;
3val result2 = test2 match {
4  case i if i + 1 == 2 => "one"
5  case i if i + 1 == 3 => "tow"
6  case _ => "error"
7}
8println(result2)
9
10//通过模式匹配进行类型条件判断
11val t3 = 1
12println(Test3(t3))
13
14//通过模式匹配进行类型条件判断
15val t4 = "1"
16println(Test3((t4)))
17
18//通过模式匹配进行类的判断与执行
19val test5 = Class1("1", "2")
20ClassMatch(test5)
21
22val test6 = Class2("3")
23ClassMatch(test6)

}

def ClassMatch(classTest: Any): Unit = { classTest match { case Class1(param1, param2) => { println("Class1:" + param1 + "_" + param2) } case Class2(param1) => { println("Class2:" + param1) } case _ => println("error") } }

def Test3(data: Any): String = { data match { case x: Int => "Int" case x: String => "String" case _ => "unkown" } } }