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annotate chapter9/WithPrintWriter.scala @ 0:b316eec6fa7a draft default tip

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add sample files
author Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
date Tue, 08 Jan 2013 16:41:46 +0900
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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1 import java.io.File
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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2 import java.io.PrintWriter
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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3
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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4 object WithPrintWriter {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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5 def withPrintWriter(file: File, op: PrintWriter => Unit) {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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6 val writer = new PrintWriter(file)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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7 try {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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8 op(writer)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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9 } finally {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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10 writer.close()
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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11 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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12 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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13 def main(args: Array[String]) {
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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14 withPrintWriter(
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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15 new File("date.txt"),
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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16 writer => writer.println(new java.util.Date)
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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17 )
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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18 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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19 }
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
parents:
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20
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Nobuyasu Oshiro <dimolto@cr.ie.u-ryukyu.ac.jp>
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