Re: List of Interfaced-Objects not being set at serialized

andrewfsears@gmail.com wrote:


Possibly there is some bug in your code.

Try that:

<code>
import java.io.*;
import java.util.*;

public class Test {

     public static class YourClass implements Serializable {
         private static final long serialVersionUID = 1L;
         private List<Shape> shapes
                 = new ArrayList<Shape>();

         public void addShape(Shape shape) { shapes.add(shape); }
     }

     public interface Shape { }

     public static class Square implements Shape, Serializable {
         private static final long serialVersionUID = 1L;
     }

     public static class Circle implements Shape, Serializable {
         private static final long serialVersionUID = 1L;
     }

     public static void main(String[] args) throws Exception {
         YourClass blah = new YourClass();
         blah.addShape( new Circle() );
         blah.addShape( new Square() );
         blah.addShape( new Circle() );

         System.out.println(blah.shapes);

         ByteArrayOutputStream baos = new ByteArrayOutputStream();
         ObjectOutputStream oos = new ObjectOutputStream(baos);
         oos.writeObject(blah);
         oos.close();
         ObjectInputStream ois = new ObjectInputStream(
                 new ByteArrayInputStream(baos.toByteArray()));
         blah = (YourClass) ois.readObject();

         System.out.println(blah.shapes);
     }
}
</code>

The output on my machine is:

[Test$Circle@30c221, Test$Square@119298d, Test$Circle@f72617]
[Test$Circle@cd2c3c, Test$Square@13582d, Test$Circle@21b6d]

So everything seems to work as expected.

Could you show us the code that you use to serialize/deserialize your
objects?

piotr