Scala的Tuple拉链操作、Java Map与Scala Map的隐式转换

xiaoxiao2021-02-28 95

Tuple拉链操作指的就是zip操作

zip操作，是Array类的方法，用于将两个Array，合并为一个Array 比如Array(v1)和Array(v2)，使用zip操作合并后的格式为Array((v1,v2)) 合并后的Array的元素类型为Tuple val students = Array("Leo", "Jack", "Jen") val scores = Array(80, 100, 90) val studentScores = students.zip(scores) for ((student, score) <- studentScores) println(student + " " + score) 如果Array的元素类型是个Tuple，调用Array的toMap方法，可以将Array转换为Map

studentScores.toMap

Java Map与Scala Map的隐式转换

import scala.collection.JavaConversions.mapAsScalaMap val javaScores = new java.util.HashMap[String, Int]() javaScores.put("Alice", 10) javaScores.put("Bob", 3) javaScores.put("Cindy", 8) val scalaScores: scala.collection.mutable.Map[String, Int] = javaScores import scala.collection.JavaConversions.mapAsJavaMap import java.awt.font.TextAttribute._ val scalaAttrMap = Map(FAMILY -> "Serif", SIZE -> 12) val font = new java.awt.Font(scalaAttrMap)

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