object Demo {
def time[R](block: => R): R = {
val start = System.nanoTime()
val result = block // call-by-name
val end = System.nanoTime()
println(
"\n\n--------------------------------")
println(
"past:[" + (end - start) +
"ns]")
println(
"--------------------------------")
result
}
def main(args: Array[String]): Unit = {
time {
1 to
1000 by
1 toList}
}
}
转载请注明原文地址: https://www.6miu.com/read-58044.html
