Question

是否可以将这两行代码合并为一个？

意思是，我们可以在一行中执行ToString（）和.replace（）吗？

[warn] Strategy 'first' was applied to 247 files
[info] Assembly up to date: D:\dev\spark-1.5.1\assembly\target\scala-2.10\spark-assembly-1.5.1-hadoop2.6.0.jar
java.lang.IllegalStateException: impossible to get artifacts when data has not been loaded. IvyNode = org.scala-lang#scala-library;2.10.3
        at org.apache.ivy.core.resolve.IvyNode.getArtifacts(IvyNode.java:809)
        at org.apache.ivy.core.resolve.IvyNode.getSelectedArtifacts(IvyNode.java:786)
        at org.apache.ivy.core.report.ResolveReport.setDependencies(ResolveReport.java:235)
        at org.apache.ivy.core.resolve.ResolveEngine.resolve(ResolveEngine.java:235)
        at org.apache.ivy.Ivy.resolve(Ivy.java:517)
        at sbt.IvyActions$.sbt$IvyActions$$resolve(IvyActions.scala:266)
        at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:175)
        at sbt.IvyActions$$anonfun$updateEither$1.apply(IvyActions.scala:157)
        at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:151)
        at sbt.IvySbt$Module$$anonfun$withModule$1.apply(Ivy.scala:151)
        at sbt.IvySbt$$anonfun$withIvy$1.apply(Ivy.scala:128)
        at sbt.IvySbt.sbt$IvySbt$$action$1(Ivy.scala:56)
        at sbt.IvySbt$$anon$4.call(Ivy.scala:64)
        at xsbt.boot.Locks$GlobalLock.withChannel$1(Locks.scala:93)
        at xsbt.boot.Locks$GlobalLock.xsbt$boot$Locks$GlobalLock$$withChannelRetries$1(Locks.scala:78)
        at xsbt.boot.Locks$GlobalLock$$anonfun$withFileLock$1.apply(Locks.scala:97)
        at xsbt.boot.Using$.withResource(Using.scala:10)
        at xsbt.boot.Using$.apply(Using.scala:9)
        at xsbt.boot.Locks$GlobalLock.ignoringDeadlockAvoided(Locks.scala:58)
        at xsbt.boot.Locks$GlobalLock.withLock(Locks.scala:48)
        at xsbt.boot.Locks$.apply0(Locks.scala:31)
        at xsbt.boot.Locks$.apply(Locks.scala:28)
        at sbt.IvySbt.withDefaultLogger(Ivy.scala:64)
        at sbt.IvySbt.withIvy(Ivy.scala:123)
        at sbt.IvySbt.withIvy(Ivy.scala:120)
        at sbt.IvySbt$Module.withModule(Ivy.scala:151)
        at sbt.IvyActions$.updateEither(IvyActions.scala:157)
        at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1318)
        at sbt.Classpaths$$anonfun$sbt$Classpaths$$work$1$1.apply(Defaults.scala:1315)
        at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$85.apply(Defaults.scala:1345)
        at sbt.Classpaths$$anonfun$doWork$1$1$$anonfun$85.apply(Defaults.scala:1343)
        at sbt.Tracked$$anonfun$lastOutput$1.apply(Tracked.scala:35)
        at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1348)
        at sbt.Classpaths$$anonfun$doWork$1$1.apply(Defaults.scala:1342)
        at sbt.Tracked$$anonfun$inputChanged$1.apply(Tracked.scala:45)
        at sbt.Classpaths$.cachedUpdate(Defaults.scala:1360)
        at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1300)
        at sbt.Classpaths$$anonfun$updateTask$1.apply(Defaults.scala:1275)
        at scala.Function1$$anonfun$compose$1.apply(Function1.scala:47)
        at sbt.$tilde$greater$$anonfun$$u2219$1.apply(TypeFunctions.scala:40)
        at sbt.std.Transform$$anon$4.work(System.scala:63)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
        at sbt.Execute$$anonfun$submit$1$$anonfun$apply$1.apply(Execute.scala:226)
        at sbt.ErrorHandling$.wideConvert(ErrorHandling.scala:17)
        at sbt.Execute.work(Execute.scala:235)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
        at sbt.Execute$$anonfun$submit$1.apply(Execute.scala:226)
        at sbt.ConcurrentRestrictions$$anon$4$$anonfun$1.apply(ConcurrentRestrictions.scala:159)
        at sbt.CompletionService$$anon$2.call(CompletionService.scala:28)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
        at java.util.concurrent.FutureTask.run(FutureTask.java:266)
        at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
        at java.lang.Thread.run(Thread.java:745)
[error] (hive/*:update) java.lang.IllegalStateException: impossible to get artifacts when data has not been loaded. IvyNode = org.scala-lang#scala-library;2.10.3
[error] Total time: 200 s, completed 2016-1-25 10:49:27

Answer 1

是的，你可以链接方法。

myFirstVar.toString().replace('a', 'u')

注意：

ToString应为toString

String#replace只会替换第一次出现的字符串。要替换所有出现次数，请使用RegEx
替换

Answer 2

您可以使用：

 var mySecondVar = myFirstVar.toString().replace("a","u");

ToString（）和.replace在一行？

2 个答案: