云星数据---Scala实战系列(精品版)】：Scala入门教程044-Scala实战源码-Scala 元组Tuple操作

Scala 元组Tuple操作

package scala_learn.demo11_Collection/** * Created by liguohua on 2017/3/1. */object O4_Tuple {  def main(args: Array[String]) {    test5  }  def test5: Unit = {    //定义一个元组,key=(zhangsan,18) ,value=female    val stu = "zhangsan" -> 18 -> "female"    println(stu._1 + "\t" + stu._2)    println(stu._1._1 + "\t" + stu._1._2 + "\t" ++ stu._2)  }  def test4: Unit = {    //定义一个元组,key=zhangsan ,value=18    val stu = "zhangsan" -> 18    println(stu._1 + "\t" + stu._2)  }  def test3: Unit = {    val stu = ("zhangsan", 18)    //元组进行模式匹配    stu match {      case t: (String, Int) => println("right")      case t: (Int, String) => println("right")      case _ => println("error")    }  }  def test2: Unit = {    //定义一个元组，元组中可以嵌套元组    val stu1 = ("zhangsan", ("shandong", "jinan"))    //取出元组中的元素，元组下标从1开始    println(stu1._1 + "\t" + stu1._2)    //取出元组中的元素，元组下标从1开始    println(stu1._1 + "\t" + stu1._2._1 + "\t" + stu1._2._2)  }  def test1: Unit = {    //定义一个元组，元组中的数据类型是多样的    val stu1 = ("zhangsan", 18, "female")    //取出元组中的元素，元组下标从1开始    println(stu1._1 + "\t" + stu1._2 + "\t" + stu1._3)    //元组中的元素也不能被改变    //stu1._1="zhangsanfeng"//错误，元组中的元素也不能被改变  }}