java serialization and final fields
- by mdma
I have an class defining an immutable value type that I now need to serialize. The immutability comes from the final fields which are set in the constructor. I've tried serializing, and it works (surprisingly?) - but I've no idea how.
Here's an example of the class
public class MyValueType implements Serializable
{
private final int value;
private transient int derivedValue;
public MyValueType(int value)
{
this.value = value;
this.derivedValue = derivedValue(value);
}
// getters etc...
}
Given that the class doesn't have a no arg constructor, how can it be instantiated and the final field set?
(An aside - I noticed this class particularly because IDEA wasn't generating a "no serialVersionUID" inspection warning for this class, yet successfully generated warnings for other classes that I've just made serializable.)
