Mega Code Archive
Controlling serialization by adding your own writeObject() and readObject() methods
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// : 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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