scala 获取数组中元素_从Scala中的元素列表中获取随机元素

scala 获取数组中元素

We can access a random element from a list in Scala using the random variable. To use the random variable, we need to import the Random class.

我们可以使用随机变量从Scala中的列表访问随机元素。要使用随机变量，我们需要导入Random类。

Importing the Random class,

导入Random类，

    import.scala.util.Random

Create a random variable,

创建一个随机变量，

    val random_var = new Random

Accessing random element in list,

访问列表中的随机元素，

    value = list(random_var.nextInt(list.length))

Let's take an example to get a random element from a list in Scala,

让我们举一个例子，从Scala的列表中获取随机元素，

import scala.util.Random
object MyClass {
def main(args: Array[String]) {
val list = List(12, 65, 89, 41, 99, 102)
val random = new Random
println("Random value of the list " + list(random.nextInt(list.length)))
}
}

Output

输出量

RUN 1:
Random value of the list 102RUN2:
Random value of the list 65

Explanation:

说明：

Here, we will find the random value from the list. The code looks a bit more stuffed so let's break the extracting process of random value so that it can be easily understandable.

在这里，我们将从列表中找到随机值。该代码看起来有点塞满了，所以让我们中断随机值的提取过程，使其易于理解。

    list(random.nextInt(list.length))

This will extract a random value from the list. So, what we have done is accessing the random index of the list which is done by random.nextInt(list.length). In this, the nextInt() method of Random class is accessed which takes the limits and returns a random value.

这将从列表中提取一个随机值。因此，我们要做的就是访问由random.nextInt(list.length)完成的列表的随机索引。在这种情况下，访问Random类的nextInt()方法，该方法获取限制并返回一个随机值。