// serialization/SerialCtl.java
// (c)2017 MindView LLC: see Copyright.txt
// We make no guarantees that this code is fit for any purpose.
// Visit http://OnJava8.com for more book information.
// Controlling serialization by adding your own
// writeObject() and readObject() methods
import java.io.*;

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;
 }
 @Override
 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) {
 SerialCtl sc = new SerialCtl("Test1", "Test2");
 System.out.println("Before:\n" + sc);
 try (
 ByteArrayOutputStream buf =
 new ByteArrayOutputStream();
 ObjectOutputStream o =
 new ObjectOutputStream(buf);
 ) {
 o.writeObject(sc);
 // Now get it back:
 try (
 ObjectInputStream in =
 new ObjectInputStream(
 new ByteArrayInputStream(
 buf.toByteArray()));
 ) {
 SerialCtl sc2 = (SerialCtl)in.readObject();
 System.out.println("After:\n" + sc2);
 }
 } catch(IOException | ClassNotFoundException e) {
 throw new RuntimeException(e);
 }
 }
}
/* Output:
Before:
Not Transient: Test1
Transient: Test2
After:
Not Transient: Test1
Transient: Test2
*/