标签：rgs tco print stc nbsp foreach tor 循环 eof
发现scala里没有break和continue, 有时候实在是需要的话就要自己try catch异常,代码看起来有点蛋疼, 所以封装了一个可break和continue的foreach.
import scala.collection.TraversableLike
case class Breakable() {
def break: Unit = throw new BreakException
def continue: Unit = throw new ContinueException
def foreach(t: TraversableLike[_, _], op: Any => Unit): Unit = {
try {
t.foreach(i => {
try {
op(i)
}catch {
case ex : Throwable =>
if(!ex.isInstanceOf[ContinueException]) throw ex
}
})
}catch {
case ex : Throwable =>
if(!ex.isInstanceOf[BreakException]) throw ex
}
}
class BreakException extends Exception
class ContinueException extends Exception
}
使用
import com.myTest.util.Breakable
/**
* Created by Administrator on 2017/2/25 0025.
*/
object TestCode {
def main(args: Array[String]) {
val b = Breakable()
val a = List(1,2,3,4,5,6,7,8,9)
b.foreach(a, i => {
if(i == 5) b.continue
if(i == 7) b.break
println(i)
})
}
}
输出
1
2
3
4
6
Scala 封装可break和continue的foreach循环
标签：rgs tco print stc nbsp foreach tor 循环 eof
原文地址：http://www.cnblogs.com/drwong/p/6617583.html
