如何在 Scala 中的语句之间等待 N 秒？
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时间：2020-10-22 08:02:00 来源:igfitidea点击:
How to wait for N seconds between statements in Scala?
提问by Mamun
I have two statements like this:
我有两个这样的声明：
val a = 1
val b = 2
In between the 2 statements, I want to pause for N seconds like I can in bashwith sleepcommand.
在这两个语句之间，我想暂停 N 秒，就像我可以bash使用sleep命令一样。
回答by Carson Pun
You can try:
你可以试试：
val a = 1
Thread.sleep(1000) // wait for 1000 millisecond
val b = 2
You can change 1000 to other values to accommodate to your needs.
您可以将 1000 更改为其他值以满足您的需要。
回答by som-snytt
Given:
鉴于：
package object wrap {
import java.time._
def delayed[A](a: => A): A = {
Console println Instant.now
Thread.sleep(1000L)
val x = a
Console println Instant.now
x
}
}
You can:
你可以：
Welcome to Scala 2.12.0-M3 (Java HotSpot(TM) 64-Bit Server VM, Java 1.8.0_60).
Type in expressions for evaluation. Or try :help.
scala> $intp.setExecutionWrapper("wrap.delayed")
scala> { println("running"); 42 }
2016-02-20T06:28:17.372Z
running
2016-02-20T06:28:18.388Z
res1: Int = 42
scala> :quit
