Java tutorial
import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.io.Serializable; public class Main { public static void main(String[] args) throws Exception { FileOutputStream out = new FileOutputStream("test.txt"); ObjectOutputStream oout = new ObjectOutputStream(out); oout.writeObject(new Example()); oout.flush(); oout.close(); ObjectInputStream ois = new ObjectInputStream(new FileInputStream("test.txt")); Example a = (Example) ois.readObject(); System.out.println(a.s); ois.close(); } } class Example implements Serializable { String s = "Hello World from java2s.com!"; private void readObject(ObjectInputStream in) throws IOException, ClassNotFoundException { in.defaultReadObject(); } }