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                ### 基本文件的輸出 `FileWriter` 對象用于向文件寫入數據。實際使用時,我們通常會用 `BufferedWriter` 將其包裝起來以增加緩沖的功能(可以試試移除此包裝來感受一下它對性能的影響——緩沖往往能顯著地增加 I/O 操作的性能)。在本例中,為了提供格式化功能,它又被裝飾成了 `PrintWriter`。按照這種方式創建的數據文件可作為普通文本文件來讀取。 ```java // iostreams/BasicFileOutput.java // {VisuallyInspectOutput} import java.io.*; public class BasicFileOutput { static String file = "BasicFileOutput.dat"; public static void main(String[] args) { try ( BufferedReader in = new BufferedReader( new StringReader( BufferedInputFile.read( "BasicFileOutput.java"))); PrintWriter out = new PrintWriter( new BufferedWriter(new FileWriter(file))) ) { in.lines().forEach(out::println); } catch (IOException e) { throw new RuntimeException(e); } // Show the stored file: System.out.println(BufferedInputFile.read(file)); } } ``` `try-with-resources` 語句會自動 flush 并關閉文件。
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