20. DataOutputStream example: two ways to write a binary string

• 
  import java.nio.file.*;
  import java.io.*;
  
  public class UnicodeOutput
  {
      public static void main(String[] args)
      {
          try {
              DataOutputStream out =
                  new DataOutputStream(
                  new BufferedOutputStream(
                  new FileOutputStream("books.bin")));
  
              // create a test string
              String testString = "This is a test string.\n";
  
              // use the writeUTF method
              out.writeUTF(testString);
              int writeSize1 = out.size();
              System.out.println(
                  "writeUTF writes " + writeSize1 + " bytes.");
  
              // use the writeChars method
              out.writeChars(testString);
              int writeSize2 = out.size() - writeSize1;
              System.out.println(
                  "writeChars writes " + writeSize2 + " bytes.\n");
  
              out.close();
          } catch ( IOException ex ) {
              ex.printStackTrace();
          }
      }
  }//class UnicodeOutput
  
  

• Resulting output

  
      writeUTF writes 25 bytes.
      writeChars writes 46 bytes.