import scala.concurrent.ExecutionContext.Implicits.global
import scala.concurrent._

val f1 = Future{ 
Thread.sleep(3000)
println("Future1.time="+java.time.LocalDateTime.now().toString())
println("Future1.currentThread="+Thread.currentThread().getName)
1 + 2
 }
val f2 = Future{ 
Thread.sleep(5000)
println("Future2.time="+java.time.LocalDateTime.now().toString())
println("Future2.currentThread="+Thread.currentThread().getName)

3 + 4 
}
for {
    v1 <- f1
    v2 <- f2
}{
    println("time1="+java.time.LocalDateTime.now().toString())
    println("currentThread1="+Thread.currentThread().getName)
    
    println(v1 + v2) // 10
    println("time2="+java.time.LocalDateTime.now().toString())
    println("currentThread2="+Thread.currentThread().getName)
       
}



代码复制到 scala shell 运行
输出结果

Future1.time=2022-02-14T08:52:01.060
Future1.currentThread=scala-execution-context-global-20
Future2.time=2022-02-14T08:52:03.247
Future2.currentThread=scala-execution-context-global-21
time1=2022-02-14T08:52:03.247
currentThread1=scala-execution-context-global-21
10
time2=2022-02-14T08:52:03.247
currentThread2=scala-execution-context-global-21



放到 main里运行
记得最后 sleep 下 ，否则 main线程 结束后 ，程序退出 ，看不到输出


Future1.time=2022-02-14T08:50:17.352
Future1.currentThread=ForkJoinPool-1-worker-13
Future2.time=2022-02-14T08:50:19.293
Future2.currentThread=ForkJoinPool-1-worker-11
time1=2022-02-14T08:50:19.294
currentThread1=ForkJoinPool-1-worker-11
10
time2=2022-02-14T08:50:19.294
currentThread2=ForkJoinPool-1-worker-11

https://gitee.com/dyyx/hellocode/blob/master/demo/scala/scalademo/src/main/java/demo/FutureForDemo.scala