Java ObjectInputStream(InputStream in) Constructor

public ObjectInputStream(InputStream in)     throws IOException

//from ww  w  . j a  v  a2s .  c om
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

public class Main {

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

    String s = "Hello World!";
    FileOutputStream out = new FileOutputStream("test.txt");
    ObjectOutputStream oout = new ObjectOutputStream(out);

    oout.writeUTF(s);
    oout.writeUTF("This is an example from java2s.com");
    oout.flush();
    oout.close();
    
    ObjectInputStream ois = new ObjectInputStream(new FileInputStream(
        "test.txt"));


    ois.skipBytes(4);
    for (int i = 0; i < ois.available() - 4; i++) {
      System.out.print((char) ois.readByte());
    }
    ois.close();
  }
}