21. DataInputStream example: two ways to read a binary string

• 
  import java.nio.file.*;
  import java.io.*;
  
  public class UnicodeInput
  {
      public static void main(String[] args)
      {
          try {
              DataInputStream in =
                  new DataInputStream(
                  new BufferedInputStream(
                  new FileInputStream("myfile.dat")));
  
              // get total bytes
              int totalBytes = in.available();
  
              // use the readUTF method
              String string1 = in.readUTF();
              int readSize1 = totalBytes - in.available();
              System.out.println("readUTF reads " + readSize1 +
                  " bytes.");
  
              // use the readChar method
              int readSize2 = 0;
              String string2 = "";
              int charCount = in.available() / 2;
              for (int i = 0; i < charCount; i++)
              {
                  string2 += in.readChar();
                  readSize2 += 2;
              }
              System.out.println("readChar reads " + readSize2 +
                  " bytes.\n");
          } catch ( IOException ex ) {
          }
      }
  }//class UnicodeInput
  
  

• Resulting output from the binary strings

  
      readUTF reads 25 bytes.
      readChar reads 46 bytes.