import java.io.*; public class Main { public static void main(String[] args) throws IOException, ClassNotFoundException { byte b[] = {00,00,00,12}; File file = new File("Integer.dat"); FileOutputStream fos = new FileOutputStream(file); //YourClass object = (YourClass) ois.readObject(); ObjectOutputStream oos = new ObjectOutputStream(fos); oos.writeInt(01);oos.writeInt(02);oos.writeObject("Ciao"); oos.write( b); oos.flush();oos.close(); /*------------------*/ FileInputStream fis = new FileInputStream(file); ObjectInputStream ois = new ObjectInputStream(fis); System.out.println(ois.readInt()); System.out.println(ois.readInt()); String s = (String) ois.readObject(); System.out.println(s); ois.read(b); for (byte by:b) System.out.print(by+" "); System.out.println(); oos.close(); } }