java array to list java 背景想把数组转为list,使用list的判断元素是否存在的方法,结果发现一个坑,int类型的数组失败了 步骤 public static void main(String[] args) { int[] nums = {3, 5, 1, 2, 9}; System.out.println(Arrays.asList(nums).size()); } 结果为1 这样不行,会有boxing issue g...
objectconstructorTest{defmain(args:Array[String]):Unit= {valp1:Person=newPerson("ljq",13)println(s"=>$p1")valp2:Person=newPerson("ljq")println(s"=>$p2")valp3:Person=newPerson(25)println(s"=>$p3")}}// 私有化主构造器:class Person private (inName: String, inAge: Int)classPerson(i...
Scala数组可以通过调用toBuffer方法将其转换为ArrayBuffer。具体代码如下: 代码语言:txt 复制 import scala.collection.mutable.ArrayBuffer val array: Array[Int] = Array(1, 2, 3, 4, 5) val arrayBuffer: ArrayBuffer[Int] = array.toBuffer 在上述示例中,我们首先创建了一个类型为Array[Int]的数组array,其中...
Data logs are entered into the code as a single string which might contain multiple lines of code and to work properly with this type of strings we need to convert multiline string to an array of single-line string in Scala. Here, is the program that will be helpful to you in ...
As a final example, you can also use the Scala mkString method to convert an Int array to a String, like this:scala> val numbers = Array(1,2,3) numbers: Array[Int] = Array(1, 2, 3) scala> val string = numbers.mkString(", ") string: String = 1, 2, 3 ...
// Program to convert Byte Array to String object MyObject { def main(args: Array[String]) { val byteArray = Array[Byte](73, 110, 99, 108, 117, 100, 101, 104, 101, 108, 112) val convertedString = new String(byteArray) println("The converted string '" + convertedString + "'"...
def main(args: Array[String]): Unit={//导入隐式转换importContext.file2RichFile//File类本身没有read方法 通过隐式转换完成//这里的read方法是RichFile类中的方法 需要通过隐式转换File --> RichFileprintln(newFile("E:\\2.txt").read) }
res6: Array[String] = Array(sparkspark, hivehive, hadoophadoop) List类型: scala> val list=List("Spark"->1,"hive"->2,"hadoop"->2) list: List[(String, Int)] = List((Spark,1), (hive,2), (hadoop,2)) //写法1 scala> list.map(x=>x._1) ...
一般情况下,protobuf-java 和 Scala 之间都能找到对应类型,比如 java.util.List 和 Seq/List/Array,Timestamp 和 ZonedDateTime,同时一些 Scala 中 Option 类型也可以用 protobuf 是一封装类型去表示,比如 Option[String] 可以用 StringValue 去表示。因为每个类型都有自己对应的特性,类型嵌套又会增加极大地增加复...
# Created by Wang, Jerry, last modified on Sep 25, 2015通过() 传入下表进行数组遍历: 给数组每个元素加上"[" 和"]":