Java ObjectInputStream .resolveObject (Object obj)

protected Object resolveObject(Object obj)   throws IOException

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
/*from   w ww .j  a  v  a 2s.co m*/
public class Main extends ObjectInputStream {

  public Main(InputStream in) throws IOException {
    super(in);
  }

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

    String s = "Hello World from java2s.com";

    FileOutputStream out = new FileOutputStream("test.txt");
    ObjectOutputStream oout = new ObjectOutputStream(out);

    // write something in the file
    oout.writeUTF(s);
    oout.flush();

    // create an ObjectInputStream for the file we created before
    Main ois = new Main(new FileInputStream("test.txt"));

    // enable object resolving
    ois.enableResolveObject(true);

    // get the class for string and print the name
    System.out.println(ois.resolveObject(ois.readUTF()));
    ois.close();
  }
}