Java ObjectOutputStream .writeChars (String str)

public void writeChars(String str)  throws IOException

//from w  ww  .j  av a  2  s.  c  om
import java.io.BufferedInputStream;
import java.io.BufferedOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Arrays;

public class Main {
  public static void main(String[] args) throws Exception {

    ObjectOutputStream out = new ObjectOutputStream(new BufferedOutputStream(
        new FileOutputStream("file.data")));
    out.writeChars("java2s.com");
    out.close();

    ObjectInputStream in = new ObjectInputStream(new BufferedInputStream(
        new FileInputStream("file.data")));

    byte[] byteArray = new byte[10];
    in.read(byteArray);
    System.out.println(Arrays.toString(byteArray));
    in.close();
  }
}