Java 實例 - 將文件內容複製到另一個文件

以下實例示範了使用BufferedWriter 類別的read 和write 方法將檔案內容複製到另一個檔案：

/*
 author by w3cschool.cc
 Main.java
 */import java.io.*;public class Main {
   public static void main(String[] args) 
   throws Exception {
      BufferedWriter out1 = new BufferedWriter
      (new FileWriter("srcfile"));
      out1.write("string to be copied\n");
      out1.close();
      InputStream in = new FileInputStream
      (new File("srcfile"));
      OutputStream out = new FileOutputStream
      (new File("destnfile"));
      byte[] buf = new byte[1024];
      int len;
      while ((len = in.read(buf)) > 0) {
         out.write(buf, 0, len);
      }
      in.close();
      out.close();
      BufferedReader in1 = new BufferedReader
      (new FileReader("destnfile"));
      String str;
      while ((str = in1.readLine()) != null) {
         System.out.println(str);
      }
      in.close();
   }}

以上程式碼執行輸出結果為：

string to be copied

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