Working with ObjectOutputStream and ObjectInputStream : Serialization « File « SCJP

1. SCJP
2. File
3. Serialization

import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

class Cat implements Serializable {
}

public class MainClass {
  public static void main(String[] args) {
    Cat c = new Cat();
    try {
      FileOutputStream fs = new FileOutputStream("testSer.ser");
      ObjectOutputStream os = new ObjectOutputStream(fs);
      os.writeObject(c);
      os.close();
    } catch (Exception e) {
      e.printStackTrace();
    }

    try {
      FileInputStream fis = new FileInputStream("testSer.ser");
      ObjectInputStream ois = new ObjectInputStream(fis);
      c = (Cat) ois.readObject();
      ois.close();
    } catch (Exception e) {
      e.printStackTrace();
    }
  }
}