Java Tutorial/File/Buffer

Using a Formatter Object to Load a Buffer

   <source lang="java">

import java.io.File; import java.io.FileNotFoundException; import java.io.FileOutputStream; import java.io.IOException; import java.nio.ByteBuffer; import java.nio.CharBuffer; import java.nio.channels.FileChannel; import java.util.Formatter; public class MainClass {

 public static void main(String[] args) {
   String[] phrases = { "A", "B 1", "C 1.3" };
   String dirname = "C:/test";
   String filename = "Phrases.txt";
   File dir = new File(dirname);
   File aFile = new File(dir, filename);
   FileOutputStream outputFile = null;
   try {
     outputFile = new FileOutputStream(aFile, true);
   } catch (FileNotFoundException e) {
     e.printStackTrace(System.err);
   }
   FileChannel outChannel = outputFile.getChannel();
   ByteBuffer buf = ByteBuffer.allocate(1024);
   System.out.println(buf.position());
   System.out.println(buf.limit());
   System.out.println(buf.capacity());
   CharBuffer charBuf = buf.asCharBuffer();
   System.out.println(charBuf.position());
   System.out.println(charBuf.limit());
   System.out.println(charBuf.capacity());
   Formatter formatter = new Formatter(charBuf);
   int number = 0;
   for (String phrase : phrases) {
     formatter.format("%n %s", ++number, phrase);
     System.out.println(charBuf.position());
     System.out.println(charBuf.limit());
     System.out.println(charBuf.capacity());
     charBuf.flip();
     System.out.println(charBuf.position());
     System.out.println(charBuf.limit());
     System.out.println(charBuf.length());
     buf.limit(2 * charBuf.length()); // Set byte buffer limit
     System.out.println(buf.position());
     System.out.println(buf.limit());
     System.out.println(buf.remaining());
     try {
       outChannel.write(buf);
       buf.clear();
       charBuf.clear();
     } catch (IOException e) {
       e.printStackTrace(System.err);
     }
   }
   try {
     outputFile.close();
   } catch (IOException e) {
     e.printStackTrace(System.err);
   }
 }

}</source>