Scala中的match(模式匹配)

文章来自：http://www.cnblogs.com/hark0623/p/4196261.html   转载请注明

代码如下：

/**

 * 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)



    //通过模式匹配进行条件判断，可自定义条件

    val test2: Int = 1;

    val result2 = test2 match {

      case i if i + 1 == 2 => "one"

      case i if i + 1 == 3 => "tow"

      case _ => "error"

    }

    println(result2)



    //通过模式匹配进行类型条件判断

    val t3 = 1

    println(Test3(t3))



    //通过模式匹配进行类型条件判断

    val t4 = "1"

    println(Test3((t4)))



    //通过模式匹配进行类的判断与执行

    val test5 = Class1("1", "2")

    ClassMatch(test5)



    val test6 = Class2("3")

    ClassMatch(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"

    }

  }

}

输出如下：

one

one

Int

String

Class1:1_2

Class2:3