Controlling serialization by adding your own writeObject() and readObject() methods

 
// : c12:SerialCtl.java
// Controlling serialization by adding your own
// writeObject() and readObject() methods.
// From 'Thinking in Java, 3rd ed.' (c) Bruce Eckel 2002
// www.BruceEckel.com. See copyright notice in CopyRight.txt.

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

public class SerialCtl implements Serializable {
  private String a;

  private transient String b;

  public SerialCtl(String aa, String bb) {
    a = "Not Transient: " + aa;
    b = "Transient: " + bb;
  }

  public String toString() {
    return a + "\n" + b;
  }

  private void writeObject(ObjectOutputStream stream) throws IOException {
    stream.defaultWriteObject();
    stream.writeObject(b);
  }

  private void readObject(ObjectInputStream stream) throws IOException,
      ClassNotFoundException {
    stream.defaultReadObject();
    b = (String) stream.readObject();
  }

  public static void main(String[] args) throws IOException,
      ClassNotFoundException {
    SerialCtl sc = new SerialCtl("Test1", "Test2");
    System.out.println("Before:\n" + sc);
    ByteArrayOutputStream buf = new ByteArrayOutputStream();
    ObjectOutputStream o = new ObjectOutputStream(buf);
    o.writeObject(sc);
    // Now get it back:
    ObjectInputStream in = new ObjectInputStream(new ByteArrayInputStream(
        buf.toByteArray()));
    SerialCtl sc2 = (SerialCtl) in.readObject();
    System.out.println("After:\n" + sc2);
  }
} ///:~

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