使用Java printwriter编写Scala文件-为什么文件写入器在此代码中停止？

Question

我正在编写一个scala测试用例，并使用printwriter填充一些数据。这没有任何意义，所以我-它看起来像附加器只是停止了四分之三的方式。

您不需要用于字数统计的代码，因为您可以看到文件中的最后一行是不完整的：

hello world duck duck sauce sauce mazing ninjakeyboard skills ninja
hello world duck duck sauce

日志：

[info] Give a file with 10 words repeated on 1000 lines and file handler 
[info] - should give us an array of 10000 words *** FAILED ***
[info]   8434 did not equal 10000 (WordCountFileHandler.scala:20)

代码：

import java.io.PrintWriter
import org.scalatest.FlatSpec
import org.scalatest.matchers.ShouldMatchers
import WordCountFileHandler.WordCountFileHandler

class WordCountFileHandler extends FlatSpec with ShouldMatchers {

  "Give a file with 10 words repeated on 1000 lines and file handler" should "give us an array of 10000 words" in {
    val filename = java.util.UUID.randomUUID().toString
    val testFile = new PrintWriter( filename , "UTF-8")
    for (x <- 1 to 1000) yield {testFile.println("hello world duck duck sauce sauce mazing ninjakeyboard skills ninja")}
    testFile.close()


    val testOutput = WordCountFileHandler (filename)
    testOutput.size should equal(1)
    //testOutput.head.foreach(println(_))
    testOutput.head.size should equal (10000)
  }
}

Answer 1

看起来缓冲区没有刷新--我遗漏了file.close()，在添加它之后，它就可以工作了！很抱歉浪费你的时间。

谢谢,