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                ### 文本文件輸出快捷方式 Java 5 在 `PrintWriter` 中添加了一個輔助構造器,有了它,你在創建并寫入文件時,就不必每次都手動執行一些裝飾的工作。下面的代碼使用這種快捷方式重寫了 `BasicFileOutput.java`: ```java // iostreams/FileOutputShortcut.java // {VisuallyInspectOutput} import java.io.*; public class FileOutputShortcut { static String file = "FileOutputShortcut.dat"; public static void main(String[] args) { try ( BufferedReader in = new BufferedReader( new StringReader(BufferedInputFile.read( "FileOutputShortcut.java"))); // Here's the shortcut: PrintWriter out = new PrintWriter(file) ) { in.lines().forEach(out::println); } catch (IOException e) { throw new RuntimeException(e); } System.out.println(BufferedInputFile.read(file)); } } ``` 使用這種方式仍具備了緩沖的功能,只是現在不必自己手動添加緩沖了。但遺憾的是,其它常見的寫入任務都沒有快捷方式,因此典型的 I/O 流依舊涉及大量冗余的代碼。本書[文件](./17-Files.md)一章中介紹的另一種方式,對此類任務進行了極大的簡化。
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