The following exception is thrown when you run the attached program.

--------------------------------------------------------
java.io.NotSerializableException: javax.swing.JFormattedTextField$DocumentHandler
at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1148)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:366)
at java.io.ObjectOutputStream.outputClassFields(ObjectOutputStream.java:1841)
at java.io.ObjectOutputStream.defaultWriteObject(ObjectOutputStream.java:480)
at javax.swing.JFormattedTextField.writeObject(JFormattedTextField.java:597)
at java.lang.reflect.Method.invoke(Native Method)
at java.io.ObjectOutputStream.invokeObjectWriter(ObjectOutputStream.java:1878)
at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1210)
at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:366)
at TestSerialize.serializeAndDeserialize(TestSerialize.java:29)
at TestSerialize.<init>(TestSerialize.java:16)
at TestSerialize.main(TestSerialize.java:9)
--------------------------------------------------------

import java.io.*;

import javax.swing.*;
import javax.swing.table.*;

public class TestSerialize {

    public static void main(String[] args) {
        new TestSerialize();
    }

    public TestSerialize() {
        Object target = new JFormattedTextField();

        try {
            serializeAndDeserialize(target);
        } catch(Exception e) {
            e.printStackTrace();
        }

        System.exit(0);
    }

    private Object serializeAndDeserialize(Object toWrite)
        throws ClassNotFoundException, IOException {

        FileOutputStream fos = new FileOutputStream("cereal.dat");
        ObjectOutputStream oos = new ObjectOutputStream(fos);
        oos.writeObject(toWrite);
        oos.flush();
        fos.close();

        FileInputStream fis = new FileInputStream("cereal.dat");
        ObjectInputStream ois = new ObjectInputStream(fis);
        Object retVal = ois.readObject();
        fis.close();

        return retVal;
    }
}


edmund.lou@eng 2000-10-26
Swing Test Developer
----------------------------------------